W211 auxiliary battery relay About this item 100% Original Mercedes Benz Auxiliary Battery Mercedes-Benz W211 models are equipped with two batteries. (List of BCM functions: 1. Cigarette lighter fuse. If you have replaced the auxiliary battery and Auxiliary Battery Diagnosis & Replacement. It appears the relay is not being switched. Optimizes charging of auxiliary battery (G1/7) 6. This battery is 9 years old and it has lost its ability to output a high amou Nov 29, 2002 · W211 Dual Battery System Function An auxiliary battery supplies electrical energy for a limited time if the systems battery voltage is low. Not the part you need?. Discover its causes and how to fix it with my comprehensive guide. Dec 5, 2017 · Yes it does. Nov 12, 2024 · A Mercedes-Benz auxiliary battery malfunction refers to an issue with the secondary battery system in the vehicle. The relay I would have to order and is not returnable, so I also hate to spend $60 on that if it is not needed. Remove the relay Nov 29, 2002 · W211 Dual Battery System Function An auxiliary battery supplies electrical energy for a limited time if the systems battery voltage is low. Get the best deals for Mercedes E320 E550 E63 Genuine Auxiliary Battery Relay High Current New at eBay. I need to install two power plugs at the rear of the van, Dealer confirmed Aux Battery and relay under passenger seat. pdf), Text File (. Controls consumer prioritization function 5. Pulled the code, said aux W211 Wiring Diagram engine CAN BUS - Free download as PDF File (. Mercedes part # 002 542 4719 Genuine Mercedes part. Have disconnected the alarm siren which is underneath the nearside F30 Polyswitch fuse G1 Battery K57/2 Auxiliary battery relay F32 Front prefuse box G1/7 Auxiliary battery M1 Starter F33 Rear prefuse box G2 Alternator N82 Battery control module 24 Downloaded from www. Jul 24, 2024 · Peters Auto Diagnosis Fixing Services Searching for this K57/2 (Auxiliary Battery Relay) for Mercedes E 240, inbox with your price and Facebook Oct 2, 2020 · Directly from the battery, or another point, say a jumper point? Has the auxiliary battery been checked?? I have seen threads on this and other forums where unusual electrical issues can be traced back to a dead or dying aux battery. Real case study, fault codes, and diagnostic workflow explained step-by-step. This is unfortunately quite common issue across entire Mercedes model range. 05. Mar 16, 2020 · The car is a E270 W211 2003 advantage saloon The AA said the aux battery was OK all though he could not test it fully he said the battery wont let him what ever that means. Or a dying aux battery relay which regulates the transfer of power source between primary and aux battery. 37 (42% off) ; Inventory. Dec 17, 2024 · Does an "Auxiliary Battery Malfunction" message appear on your Mercedes-Benz dashboard? The problem may be the auxiliary relay or auxiliary battery. The auxiliary battery supplies power for a limited time if the system charge or battery voltage drops. The auxiliary battery supplies power for a limited time if system charging or battery voltage drops. But does the alternator need to be tested on it? I have ordered a Battery control module since this can a problem. Can anyone shed some light on what it could be? Thanks Thanks given by: Reply kechoLocation Offline Reputation: 77 Thanks Given: 93 Thanks Received: 215 (50 Jan 18, 2009 · I'd start from checking the AUX battery condition, it is behind/below the cabin air filter at the engine bay, just in front of the fire wall. A video on how to replace you're on Auxiliary battery relay. A very easy way to locate the second battery hidden under the hood. There are 2 batteries in the early 211's, one in the boot and one in the engine bay, on rhd below the pollen filter. The document offers technical details on the operation of the auxiliary battery relay, explaining its role in managing battery Oct 8, 2025 · Auxiliary Battery Relay (High Current Relay). It identifies that there are fuse boxes in the engine bay called the N10/1 box, a box inside the vehicle near the dashboard called F1/1, and a rear fuse box in the trunk called N10/2. Dual Battery System. Jan 30, 2009 · Hi, I have a 2003 e500. Charging System Diagnosis for Auxiliary Battery , Mercedes (W164) This is one issue for many Mercedes owners, CLS, S class, ML Class, GL Class, if the charging for the auxiliary battery stop working. Below windshield wiper cowl plastic trim function: It monitors the Dec 20, 2023 · In this video we see where the auxiliary battery of the Mercedes E220 W211 version is located: we need to open the front hood of the car, because the auxiliary battery, which is used to power the car's electronics, is located in the front left part of the hood, right in front of the passenger. remove plastic cover 3. com manuals search engine f Dual Battery System Diagram CAN B N10/1 - circuit 61 N73 - ignition key inserted N93 - diagnosis G1 I will be replacing the aux battery with a $40 battery instead of a MB genuine $150 battery. But if relay is on (or short circuited) or car for other reason won't sleep, aux may draw some current and of course live bus drains a bit. which serves simultaneously to supply the battery control unit (N82). Dec 19, 2021 · 3. Mercedes w211 Auxiliary Battery Relay GENUINE +1 YEAR WARRANTY | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Find great deals on eBay for Auxiliary Battery Relay. . I plugged in my icarsoft tool and found the fault code 9092 G1/7 (Auxiliary Battery) is defective or not installed. Nov 29, 2002 · W211 Dual Battery System Function An auxiliary battery supplies electrical energy for a limited time if the systems battery voltage is low. Manualslib. Jan 29, 2024 · Thanks for link regarding main battery had brand new one fitted 6 months ago. Both my Main battery and Aux battery are less than 6 months old, voltage was 12. Aug 24, 2015 · I am suspecting either the main battery or the aux battery relay. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Aug 23, 2016 · Welcome to the W211 E- Class! Try the electronics-battery section. Jul 20, 2025 · Auxiliary Battery Relay (High Current Relay). 5 years ago. Oct 19, 2018 · nope, aux battery is isolated from main circuit via isolation relay, and relay is closed (battery charged) only if system detects low voltage right after engine start. Learn how to install a new 12V auxiliary battery in a Mercedes-Benz E320. In the past, this was solved by replacing the aux battery. You are not gettining convenience shutdown Apr 3, 2007 · Most of the time the AUX battery is disconnected from the rest of the car (excluding a voltage sense wire and ground of course). Changed alternator. Struggling with my '08 Mercedes W211 E-Class battery charge issue. Please use the compatibility Oct 4, 2024 · In this video we can see where the auxiliary battery is located in the Mercedes E-Class and how to proceed in case we need to disassemble it, a very simple operation. It`s a common problem hello, anyone know where i can get the above W211 Auxiliary battery relay/module. Mar 20, 2009 · 2004 W211 E320 wagon auxiliary battery replacement I joined BenzWorld today to thank everyone who has taken the time to post a reply to the bad battery-visit workshop warning. Call us today! W211 Dual Battery System 219 BCM (ACB-ICC) 11-29-02 1 fThese technical training materials are current as of the date noted on the materials, and may be revised or updated without notice. The alternator and battery control relay were both replaced by my local specialist in 2018 and I fitted new main and auxiliary batteries last year. Feb 7, 2022 · I believe this is a pretty common problem with W211. Oct 21, 2020 · I tracked the problem down to the relay which is situated under the windscreen cowl. Located in the engine compartment, this high-quality relay functions by relaying power to various electrical systems throughout your car. Oct 8, 2025 · Auxiliary Battery Relay (High Current Relay). (UPDATE 6 MONTHS LA Mercedes-Benz Auxiliary Battery Relay Replacement K57/2 Mercedes-Benz E-Class W211 Auxiliary Battery Replacement Genuine Mercedes-Benz Auxiliary Battery 12V fitted on various models: A Class 176, 177 models B Class 242, 246, 247 models C Class 204 models CL Mercedes-Benz ML R GL Auxiliary Battery Replacement Apr 20, 2024 · Auxiliary Battery Relay (High Current Relay). Controls auxiliary battery relay (K57/2) 4. W211 Auxiliary Battery Relay Location - Free download as PDF File (. Notes emergency operation resulting in When I was chasing a powerdrain, which also affected both batteries, I opted to replace the AUX battery relay. I don't remember seeing a polyfuse next the the +ve on the aux battery but will look again tomorrow. Description, where they are K57/2 Auxiliary battery relay 48D K75 Cutoff relay for interruptible loads 48D L5 Crankshaft position sensor 5J L6/1 Left front rpm sensor 9G L6/2 Right front rpm sensor 9G L6/3 Left rear rpm sensor 9G L6/4 right rear rpm sensor 9G M3 Fuel pump (FP) 3F M4/7 Engine and AC electric suction fan with integrated control 4F M16/6 Throttle valve E55 W211 often faces battery drain and auxiliary battery relay failures causing electrical faults. And relay is pulling only short time after engine is started IF BCM finds out low voltage of the aux battery. ciao. Has the auxilliary battery ever been renewed? One of its main purposes is as a SHORT TERM backup for the SBC SYSTEM should the overall main battery/alternator fail to Learn how to install a new 12V auxiliary battery in a Mercedes-Benz E320. Feb 10, 2013 · The Aux Battery Relay looks like an absolute pig to get at requiring removal of the wiper arm assembly followed by the protective shroud underneath. Of course it could be relay malfunction, I am not sure at what conditions 'protection' message appears. However, when I replaced the battery and scanned the car for รหัสสินค้า : MERCEDES-BENZ E-CLASS W211 Battery Relay A0025424719 New Genuine Auxiliary Battery/High Current Relay Oct 30, 2025 · Auxiliary Battery Relay (High Current Relay). In this video I am showing the way I am dealing with Auxiliary Battery Malfunction problem. Nov 4, 2025 · Auxiliary battery malfunction Mercedes? Learn the causes, diagnostic steps, and how to fix or replace the auxiliary battery . This also renders the aux battery unable to charge and unable to activate if needed because the car thinks it isn't there, so it doesn't command the aux batt relay to "on" when needed. I would like to replace the auxiliary battery under the hood ( I have already replaced the main battery in the trunk). Jul 20, 2023 · I am getting the dreaded red battery alarm with Visit Workshop message on our W211 2005 estate and a 9071 diagnostic code. 12 Month Warranty. Jun 27, 2025 · Find many great new & used options and get the best deals for Mercedes w211 w219 Auxiliary Battery Relay OEM NEW + 1 year Warranty at the best online prices at eBay! Free shipping for many products! Call : 770-837-3888 https://mbtofatlanta. Feb 20, 2020 · The document discusses the fuse box locations for Mercedes-Benz E-Class W212 models from 2010-2016. The one in the engine bay (aux) is in case the main battery fails so that the SBS system can still be powered. About a week ago, I got the red battery visit workshop message. Its obvious that the SBC system is flagging up certain low voltages - the reasons for this can simply be faulty earth connections or far more complex problems. As shown, the battery is located In this video I test and replace the auxiliary battery in a 2003 Mercedes E320. Hi folks, can someone help me. Replaced both batteries & checked alternator, but error persists. Feb 15, 2019 · 211-auxiliary-battery-relay-location PDF A document that provides information about the location and function of the auxiliary battery relay in a specific vehicle model. Disconnected all power from front seats no change Icarsoft says front and rear sams are ok. This relay is just to the right of the auxiliary battery under the plastic trim where the passenger side wipers are hinged, 2 heavy wires are screwed to it with 2 small wires. Is it worth getting a Battery relay switch as well? Or any other options? :surrender: thanks Find many great new & used options and get the best deals for MERCEDES E Class W211 Battery Relay Module Control Unit 0025423819 A202 at the best online prices at eBay! Free shipping for many products! Jul 30, 2025 · Find many great new & used options and get the best deals for Mercedes w211 w219 Auxiliary Battery Relay OEM NEW + 1 year Warranty at the best online prices at eBay! Free shipping for many products! Sep 5, 2025 · Notes: Auxiliary Battery Relay. 0 sold, 3 available. Is this the correct voltage, or do I have further issues? Any help would be appreciated. I now have one on order, however whilst testing the relay, I discovered that the power source for it is only 8vdc. Dec 16, 2018 · So, the BCM doesn't know the aux battery isn't there and tosses the alarm. If you know, PLEASE The battery control module monitors system voltage. Symptoms of a faulty BCM include battery drain and erratic electrical behavior. Has anyone else had problems with this relay? Apr 2, 2014 · It SHOULD not charge aux battery, since it SHOULD be isolated by relay. i did find fuse box in the boot with folded fuse diagram but it doesn't actually tell you location and number for the auxiliary battery (capacitor) Feb 3, 2024 #4 W211 Dual Battery System Function An auxiliary battery supplies electrical energy for a limited time if the systems battery voltage is low. We need to remove the bolt that we find above the cover of the left front shock absorber, which holds Mar 11, 2013 · The understanding of the battery system in the W211 can be a bit confusing. Auxiliary battery relay, task The auxiliary battery relay (K57/2) isolates Nov 2, 2025 · Find many great new & used options and get the best deals for Original Genuine Mercedes Benz Secondary Backup SBC Auxiliary Aux Battery w211 at the best online prices at eBay! Free shipping for many products! Mar 16, 2025 · Block under the hood Mercedes-Benz w211 Under the hood, the base block with fuses and relays is located on the left side, next to the rack and is covered by a protective cover. Find many great new & used options and get the best deals for MERCEDES W211 Auxiliary Battery Relay Genuine 1 Year at the best online prices at eBay! Free shipping for many products! Have a e class 220cdi estate 2004 model, the battery symbol light up with visit the work shop, I have changed the small Jan 13, 2017 · Hello both and thanks for your input. Mercedes auxiliary battery relay is typically mounted at the top of the firewall, right below the windshield wiper motor. So I replace both, but I still don't get battery charge. 7 In stock in store ; Manufacturer Warranty Minimum of 12 Months Relays Sport Wireless Mercedes W211 Auxiliary Battery Relay GENUINE +1 YEAR WARRANTY Acdelco Battery Auxiliary Battery Relay - Compatible with 2006 - 2009 Mercedes-Benz 198. I am assuming the Jun 19, 2020 · 211-two-battery-vehicles-function PDF A technical documentation that describes the function and layout of a two-battery system in vehicles. Nov 4, 2016 · Can someone please tell me the exact location of the Auxiliary Battery Relay K57/2 on my 2008 SL55? I have about taking the car apart. My Merc battery installed on 9/2017 was dying, so I replaced the battery with a SLI94AGM Duracell Ultra Platinum AGM 850CCA BCI group 49 battery. View and Download Mercedes-Benz W211 manual online. Experience the same high-level performance as your original parts with this auxiliary battery relay. Thats ok so battery not draining back to regulator. The batteries of your w211 are absorbed glass mat (AGM) type, which is different from older style lead acid batteries. In this video we will show the location of the fuse and relay for the Auxiliary Battery Relay on Mercedes W211 E200 E220 E270 E280 E320. Always check for revised or updated information. Nov 11, 2025 · 2003-2006 Mercedes W211 E320 E500 Front Relay Box Battery Module A0025423819 Oem Service Manual - Mercedes-Benz E320 W211 Dual Battery System - Free download as PDF File (. pdf) or view presentation slides online. After expiriencing some weird electrial issues after engine start, I did some research and got to a solution that maybe my BCM or Battery control module is acting strange. All cars to which auto parts fit were provided. Could it be the BSG module? The places where the control units are located, a description of the fuses and relays Mercedes 211 with box diagrams and photos. 1. Nov 4, 2025 · MERCEDES-BENZ E-CLASS W211 Battery Relay A0025424719 $151. 90 Free shipping A0025423819 Relay Mercedes-Benz E W211 2007 Feb 12, 2023 · What Does The Auxiliary Battery Malfunction Message Mean? The Auxiliary Battery Malfunction warning message indicates that something is wrong with the secondary battery system on your Mercedes-Benz vehicle. Dealership offers option to The red battery visit workshop warning message came up on our 2006 E350. Notes emergency operation and sets fault codes (CAN communication / DTC’s) 7. 9V reading is totally fine. Mercedes E350 - W211 Bleeding Chrome 1. 8 to 13 volts. The AUX battery is isolated with a relay, of course you can find wires from the engine bay that are connected to the main battery at the trunk. Apr 4, 2008 · But checking the aux battery doesn't hurt either BTW: A bad AUX-battery, or AUX-battery relay issue would usually be accompanied with a RED battery symbol and "Drive to Workshop!" Mar 29, 2012 · Then at destination it needs another jump start. My question is: To isolate these power plugs from the starting battery do I attach power cords to the relay terminals or directly to the aux In this video you will see how to find secondary auxiliary battery on Mercedes E W211 [2002-2009]. This 12V 170A battery is designed for various models, including the E320, E350, C300, S550, and more. May 5, 2020 · In this guide, you will find instructions on how to replace the auxiliary battery relay (K57/2) on Mercedes-Benz vehicles. Can anyone help with specific instructions on removing the auxiliary battery cover and battery? Thanks Nov 18, 2024 · Get insights on preventing common auxiliary battery issues in Mercedes-Benz models with expert tips from EurAuto Shop in Plano, TX. Dec 3, 2021 · Fuse box diagram Mercedes E-class W211 E230 (third generation) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 years of manufacture. Mercedes W211 Q&A Auxiliary Battery Relay, Fault Codes & More Auxiliary Battery Relay W211 You can try a reset of the battery control module itself by disconnecting the plug at the control unit itself for at least 5 minutes. Shop with confidence. 35K subscribers Subscribe GF54. Ever wonder what that extra battery in your W211 is for? This tech article explains just that and how to replace the auxiliary battery. 10-2175-11 Auxiliary battery relay, location The auxiliary battery relay (K57/2) is located on the partition wall towards the passenger compartment in the vicinity of the auxiliary battery (G1/7). Thank you. Have a e class 220cdi estate 2004 model, the battery symbol light up with visit the work shop, I have changed the small Location of fuses and relays on Mercedes-Benz E Class All Models, 2003 to 2008. com. is used to determine the battery voltage (Gl). Jul 16, 2020 · I replaced the aux battery on my 06 CDI 2. At times the battery is charged (along with the main battery) but otherwise the relay closes only if SBC brakes are in danger to loose supply power. Description, where they are K57/2 Auxiliary battery relay 48D K75 Cutoff relay for interruptible loads 48D L5 Crankshaft position sensor 5J L6/1 Left front rpm sensor 9G L6/2 Right front rpm sensor 9G L6/3 Left rear rpm sensor 9G L6/4 right rear rpm sensor 9G M3 Fuel pump (FP) 3F M4/7 Engine and AC electric suction fan with integrated control 4F M16/6 Throttle valve . If you jump the relay contacts with a shorting link, then the Aux battery charges ok. Apr 14, 2016 · Hi all W211 bros/Sis, Manage to kapok a rather complete set of technical literature on our W211 E class from MBWorld. Description The Genuine Mercedes-Benz Relay (Battery Overload) 0025424719 is an essential component designed to ensure the reliable operation of your vehicle's electrical systems. Brand NEW part with full 1 year warranty. We’ll show you how to replace/change/remove with simple tips and tricks to help get Aug 11, 2025 · Replaces Part Number 002-542-38-19, 002-542-64-19, 0025423819, 0025426419 Category eBay Motors Parts & Accessories Car & Truck Parts & Accessories Starters, Alternators, ECUs & Wiring Relays See more MERCEDES W211 Auxiliary Battery Relay Genuine Oct 1, 2023 · Exceptional Quality and Performance: This OE replacement auxiliary battery relay is designed to meet, if not exceed, the performance and quality standards of the original equipment installed on your vehicle. An alternator test with a meter to the battery shows that the alterntor is working. There is a battery control module that monitors things and switches charge to the aux Nov 10, 2025 · Find many great new & used options and get the best deals for NEW MERCEDES-BENZ E-CLASS W211 BATTERY RELAY A0025424719 ORIGINAL at the best online prices at eBay! Free shipping for many products! Aug 20, 2012 · There was something about auxiliary battery and auxiliary battery relay but Im guessing they are because I ran out of battery while driving, and lost brakes also. Will the dash light turn off? Yes, it works. Monitors the voltages of (G1) and (G1/7) 2. You really need to power the relay off the car and check if the two main terminals go open and closed circuit using a meter. Nov 15, 2023 · Auxiliary Battery Relay (High Current Relay). 16 Function of N82 17 Auxiliary Battery Relay (K57/2) 18 Cut-Off Relay for Interruptible Loads (K75) 19 Sep 19, 2021 · AUn battery is solated via main circuit by relay. About 5 units showed up errors, the one that caught attention was an auxiliary battery code, k57/2 auxiliary battery relay. Function sequence The battery control unit (N82) measures the current from the negative terminal of the battery (Gl) and the currents of both batteries if the auxiliary battery (Gl/7) is also activated. 1 on the main when running, so I know the batteries are (likely) ok. comIf the "Auxiliary Battery Malfunction" light shows up on your dash, watch this video to find out how to change yo Apr 6, 2021 · Now, I'm not saying the Battery Control Module wouldn't eventually close the K57/2 relay if AUX battery got really low, even if car is not running and remains locked. txt) or read online for free. These batteries – sometimes known as a capacitor – are responsible for secondary functions, such as running electrical components. We’ll show you how to replace/change/remove with simple tips and tricks to help get Nov 29, 2002 · W211 Dual Battery System Function An auxiliary battery supplies electrical energy for a limited time if the systems battery voltage is low. Power up your Mercedes with the Genuine Mercedes Auxiliary Battery (part number 2115410001). Relay is pulled only if main circuit voltage drops, or right after start BCM found aux battery voltage low. It's a 2004 W211 yes? As I say though, the +ve lead of the aux battery is intact as far as the relay K57/2. How to test an additional battery SBC Systems for Mercedes W211, W219 / Battery charge test W211 Amazing Road TV 227K subscribers Subscribed Find great deals on eBay for Auxiliary Battery Relay. Leland Hardy 2006 Mercedes Benz CLS500 Auxiliary Battery Relay Removal Overview Part II 5 20 24 xuanya 677 subscribers Subscribed The secondary (auxiliary) battery is a short-term backup for the power supply in the event of the onboard system battery failing. This aux battery is responsible for powering various electrical systems in the vehicle but, most critically, allowing the electronically controlled transmission to shift in Park if the main battery power is cut. Auxiliary Battery Relay (High Current Relay) NOTE: Located in engine compartment. E Class W211, CLS Class, for example, has two batteries. So if you see battery conditioner voltage on aux poles, it means you isolation relay is welded. May 8, 2009 · They haven't tested the Battery Control Module, the battery relay but they can get the red warning light to turn off if they connect a cable from the auxiliary battery to the battery control module!? The car drives fine, there appears to be no issuses with the SBC or brakes and I have no other warnings displayed. Apr 14, 2013 · If isolation relay is ok, aux battery does not drain main battery when car is in a sleep mode (aux is isolated from main circuit). Contents: Relay. Remove the filter housing and you'll find the battery. 00 shipping New Genuine Mercedes-Benz Auxiliary Battery Relay (2003-2009) OE 0025424719 $116. All parts have 1 year warranty. I verified that the relay was faulty and the battery was quite old. Nov 2, 2025 · One New Genuine Battery Overload Relay 0025424719 0025426419 for Mercedes MB Original Equipment found in US vehicles and worldwide Located in Engine Compartment K57/2 Battery control module and cut-out relay Direct fit and function Meets or exceeds OE specification Important Automotive parts have specific fitment requirements, please do not try to make it work. Diagrams and charts are provided showing the fuse locations and amp ratings. Which is located under a plastic cover under your wiper blade arm. 10-P-4201T Model Auxiliary battery relay, location / task 16. Sep 30, 2025 · Find many great new & used options and get the best deals for Mercedes w211 w219 Auxiliary Battery Relay OEM NEW + 1 year Warranty at the best online prices at eBay! Free shipping for many products! Aug 11, 2018 · Just picked up my 2018 Metris today. In this article, we consider the third-generation Mercedes-Benz E-Class (W211), produced from 2003 to 2009. Anyway, enjoy Service Manual - Mercedes-Benz E320 W211 Dual Battery System - Free download as PDF File (. 02 211. 9v with 14. Pulled every fuse and relay and still had the drain. Fortunately, changing the aux/secondary battery is more manageable than changing the oil on your Mercedes-Benz. Oct 8, 2025 · Is there an Auxiliary Battery Malfunction message on the dashboard of your Mercedes-Benz? This guide will show you how to fix the issue on Benz cars from 2003 through 2009, specifically Mercedes-Benz E-Class W211 automobiles, including the E320, E350, E500, E55 AMG, and E63 AMG. Auxiliary Battery Relay - GM (84611502) ; MSRP: $300. The Battery Control Module (BCM) manages charging and power distribution between the main and auxiliary batteries. In a normal situation, the secondary (or AUX) battery should not be touched, but in Sep 13, 2023 · Learn about the 'Auxiliary Battery Malfunction' in your Mercedes-Benz. Here you will find fuse box diagrams of Mercedes-Benz E200 Oct 9, 2023 · Hello all, I seem to be having a problem on my 2008 W211 E550 (VIN: WDBUF72X18B219504). Built to Last: Our relays feature high-quality composite housings that protect against harsh temperatures and the most demanding under-hood conditions, ensuring lasting reliability. It includes a visual diagram showing the relay's precise placement in relation to the vehicle. To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer to the latest Mercedes-Benz Jul 24, 2024 · How To Replace The AUX Battery Relay Forums | W211 Auxiliary Battery Location | atelier-yuwa. You may get any part for the car you want. Mar 6, 2009 · I would open the trunk with the mechanical key (the metal blade hidden into the plastic key) and charge the battery. 88 ; Discount: $126. Technical details regarding voltage regulation, dynamic internal resistance, and Sep 25, 2023 · Exceptional Quality and Performance: This OE replacement auxiliary battery relay is designed to meet, if not exceed, the performance and quality standards of the original equipment installed on your vehicle. Nov 6, 2025 · Learn how to fix the Auxiliary Battery Malfunction Mercedes. Aug 4, 2020 · Auxiliary battery is good showing about 12. Monitors alternator voltage (terminal 61) via CAN B 3. If voltage reaches a low point, the auxiliary battery relay closes to connect the battery to the vehicle fuse blocks. You will still have power at both terminals since you'll get 12V from the positive terminal of the auxiliary battery on one side of the relay, while the other side is a permanent live from the main battery. Warranty Coverage Policy. Oct 2, 2017 · A document that provides information about the location and function of the auxiliary battery relay in a specific vehicle model. The battery is not new, but seems to be holding a charge fine, so I hate to drop $150 on a new one if it is the relay. Circuit 30. In that case, your Auxiliary/secondary 12-volt battery may need replacing. PicClick Insights - Mercedes w211 w219 Auxiliary Battery Relay OEM NEW + 1 year Warranty PicClick Exclusive Popularity - , 1 day for sale on eBay. Jul 29, 2025 · Auxiliary Battery Relay (High Current Relay). 0 /2 Locations K57/2 Auxiliary battery relay P54. 8v and 12. W211 automobile pdf manual download. Part Applications. So you 12. I have a 2003 Mercedes W211 and it started warning about the auxiliary battery. jp Dec 17, 2022 · The mechanic found an alternative power source, message "Auxiliary Battery Malfunction" disappeared and phone is charging nicely from its magnetic Mount thing, so the power cable plugs into that, the phone Case is magnetic and just clips on via the magic of magnetism. org and would like to share with all here (for those who like DIY) hehe: I think it's quite comprehensive and some may not be relevant/applicable to our ride locally. 94 + $28. The document includes diagrams and images illustrating the location and integration of components such as the primary battery, additional battery, and related control units. Remove wiper blade arms 2. tnxfhh udqp apsza kccuoi dvvxcw nwvld nascyk lkw ovbp nhq kkyrb dzobwc gvzay ftyyvs cke