Mercedes w140 k40 relay. I've attached a picture of the location below.
Mercedes w140 k40 relay Do Mercedes sell a genuine Nov 4, 2006 · [EDIT - Myk] also see attachments in post 319 courtesy of @BaD_81 & @M4rCu5 Early SLKs suffered from soldered joint failures on the K40 pcb. Jun 25, 2018 · My SLK 320 R170 2002 car has sporadic issues with starting, process of elimination leads me to a faulty K40 relay. The K40 relay unit is a common failure point in older Mercedes models, causing starting issues, misfires, and electrical faults. 72 2105400372 A2105400372. Fuse for cigarette lighter. It appears that this is a PCB problem (board connection fault between car lead terminations and relay), I've ordered a K40, it may take 2-3 weeks to arrive, I'll update the post when It's installed to May 31, 2024 · Hello. Nov 30, 2020 · Hi folks, after some help with my ’97 W140 S320. Reason is the headlamp wash wipe system plugs into a connector in there and a relay has to be plugged into a certain location too. Battery draining in the space of 8 hours. 0L: Engine Sensors, Relays and Switches and other parts related to Switches, Motors, Relays, Fuses & Wiring Mar 27, 2011 · Jump to Latest 18K views 5 replies 3 participants last post by davidclk Mar 28, 2011 davidclk Discussion starter 267 posts · Joined 2008 #1 ·Mar 27, 2011 i Wish to know where is the location for the k40 relay as some here think it;s a possible lead into solving the BAS/ESP problem. Inc Fuel Pump relay and fuse inc in K40 as far as I can make out :cool: Location in main component box next to air pump, horn, traction, fuel pump, combination control module Suddenly the car would no longer start. Hard to say based on the color of the CB at those locations. I don't like it. The following film describes some of the steps for looking up if the relay May 17, 2006 · The famous K40 and surrounding components. Jan 6, 2022 · W140 Mercedes s500 wiper relay location and repair part 140 542 00 19 Pete’s Carport 22. Some W140 owners asked me where the Relay's are . It won’t start and is displaying “Start Error” in the mileage display. Symptoms are: Will turn over on the key but will not run. com. The K40 is a usual suspect with non-cranking SLK R170s. That will ensure it's always running at full pressure instead of high/low as the K40 relay controls. This is a k40 relay from a Mercedes and these go out pretty often. Adding a separate relay to avoid changing the K40 relay. I would at least scout around for a replacement K40 relay while you perform these other checks. Surely they would have checked relays?? Also starting the car with brake pedal depressed dash lights come on straight away. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Genuine Mercedes Relay Module InStock Ships Today! $124. Car will not crank or start unless you manually close the traction relay and then it starts and seems to run normally until you shut it down and have to Le relais K40 est une cause bien connue de problèmes de démarrage, de ralenti et de troubles du moteur. If my interpretation is correct, the no cranking symptom is a consequence of the failure of the K40 module to supply power to the fuel pump. My '99 SLK 230 died while driving. Struggling to find where to buy one in the UK? Any recommendations bar eBay from US etc, obviously no idea of quality control buying off eBay. Depending on your vehicle production date one of those 2 fuses will be for the starter relay. 50. You will see the K40 relay module (with fuses on it). My car (2004 R170 SLK320) apparently requires a new K40 relay which I understand is a fairly common issue. Item Number: 2105400372 Main Category: MB Sub Category: Engine Electrical Description: K40 May 23, 2025 · There is an ECU relay in the K40 which controls the fan and starting sequence. I've no idea what the starting sequence logic of Engine Control Unit is though. One has the number: A170 545 00 05 And the other doesn't even have a number on it ( probably worn of ) I was so Mar 12, 2018 · Hi all, as per title I'm after the location of the K40 relay box I have a feeling it's the normal fuse box but I'm unsure. May 5, 2018 · Disconnected starter, fuse still blows with ignition on Removed K40 relay, still blows fuse with ignition on Disconnected M55 inlet port shutoff motor, fuse still blows Removed K40 board, no burnt out tracks Now I'm not sure what else is on this circuit as there is no fusecard for these 5 fuses (damn you MB) so I am stumped for now. Jun 1, 2015 · Can you tell me if my 1998 Mercedes W140 S320 has a K40 Relay module or N30 relay module. Call (310)626-8765. Also try starting the car in neutral. 1K subscribers Subscribed Jul 28, 2023 · If there are problems starting the engine and the lighting of warning lights on the instrument panel, one of the possible causes is the damage to the K40 relay which is located in the fuse keypad located in the engine compartment, on the passenger side, near the dome of the 'shock absorber: once the cover has been removed, this relay is easily identifiable; then extract it from its seat and A fix for the horn not working on a 2001 Mercedes Benz SLK230 (R171). Best replace with new Mercedes K40 from an authorised dealer since your previous repair failed. This mainly affects smooth op and fuel pump. This year I posted earlier about odd starting problems, which could well have been the K40 again, but eventually just went away. Jan 15, 2009 · i have searched all over google trying to find information on this control module but i cant find any info on which relay works what exactly? i have included a picture of my K40 module out of my pre-facelift w210 the picture i included has 5 relays but one of them does not function when i turn Jun 23, 2016 · Can anyone tell me the physical location of the 2 relays k40/2kb and k40/2kc please? I'm pretty certain they are attached to the driver side sam, but there are several and I need to know which ones are the correct ones. But now, well the car won't start at Get the best deals for 1997 Mercedes K40 Relay at eBay. Jun 1, 2015 · Thanks Alex, then with plenty being broken it should not too much of a problem to change both, the intermittent locking is a hard one unless the carbon brushes in the pump are worn out. This notorious relay plays no part in the compressor circuit but does power the idle controller that converts the induced crank sensor signal from AC to a pulsed DC engine speed signal. Aug 23, 2017 · Greetings everyone, first time poster here but long time Benz owner. com Check out our mercedes w202 k40 relay selection for the very best in unique or custom, handmade pieces from our shops. And I think we would need the IFZ unit or equivalent as well. Any advice on the following appreciated. The symptoms pointed to a faulty K40 relay that is known to give up. It seems Relay Control Module ( RCM ), we are seeing these original modules fail now on slk320, slk32, and all Crossfires causing issues with Engine Starting, Engine Fan Speed, 2ndary Air Injection Pump, Fuel Pump Power, Horns and Supercharger engagement (on SLK32 and SRT6). In this article, you will find fuse box diagrams of Mercedes-Benz G-Class G280, G300, G320, G350, G500, and G55, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay. Using aftermarket or eBay is another recipie for failure. Explore a wide range of our K40 Relay selection. The symptom is a 15A relay blows in the K40 relay when turning to start. Lorsque le K40 fonctionne mal, ces composants n'obtiennent pas la tension Apr 3, 2020 · As for the K40, if it IS the K40, you may be able to salvage it by re-flowing the solder at those 3 joints. Aug 23, 2015 · [W210] ABS Fault, How to repair K40 Relay Module (Indonesia) (ENGSUB) Oprak Oprek 741 subscribers Subscribed Ensure dependable electrical performance with the Genuine Mercedes Multi Purpose Relay (part number 0005400072) for Mercedes E320, E55 AMG, CLK320, CLK430, E430, and CLK55 AMG. Step by step guide on how to fix a common problem with the K40 Relay unit in a R170 series Mercedes Benz SLK 230. No central locking from key or centre console May 31, 2014 · This week’s tech post will cover diagnosing, removing, and installing a multi-function relay module in a 2000 Mercedes SLK230 roadster. 1) With the above fuse panel installed, the first things I would check are the fuses, especially the the 10 amp fuses, and the voltages on them with the ignition switch in "run" position. The k40 relay , starter motor relay , AC relay are the most common searched ones . First, the customer complaint: car runs great, no probl… Hi Charles, the starter relay is located behind the dash on the S class. The air pump relay is inside the K40 relay module. No central locking from key or centre console This will be similar to other mercedes benz models from the w210 generation or models made betwen 1995 and 2003 . I have a fuse diagram but it only shows the fuses as a single letter 'A' May 26, 2009 · Easy way to find out if it's the K40 relay is to run a hard wire of power to the fuel pump. I am trying to find the wiring diagram for the K40 relay. Parts# 210 540 03 72 210-540-03-72 210. W140 quality location that gets Moist & even wet under heavy rain if the Windscreen rubb Dec 23, 2008 · "over-voltage protection relay. I've attached a picture of the location below. May Qualify For FREE SHIPPING. May 17, 2006 · Weiß jemand etwas über das K40-Relais selbst und wo es sich befindet? Oder muss ich mich nur darum kümmern, das in den vorherigen Beiträgen beschriebene K40-Relaismodul zu ersetzen? SLK230 Mercedes Benz 1998 Relay - AutoPartsWarehouse. Make sure that you check fuse #2 in the trunk fuse box and fuse #16 in the fuse box under the hood. If it does have either where are they on the located on the Anyone have an engine bay photo where you could point out the K40 relay? I found the sticky with the part, found it mentioned in many threads using Aug 22, 2020 · Last year I posted about my horn not working (no sniggering), and how I managed to fix it using an external relay to the K40 unit. Featuring a K40 relay with fuse box for the passenger footwell, this relay enhances vehicle safety and functionality. Jan 7, 2022 · Following the video, the ECU Relay doesn't operate when 9v's are connected to the car lead connection terminals. In this publication, you will find a description of the fuses and relays of the Mercedes 140 with block diagrams and their Mercedes-Benz Fuse Box and Relay Diagrams - Complete Guide The fuse box in a Mercedes-Benz is a critical component that serves as the central hub for the vehicle's electrical systems. Apr 25, 2023 · So the K40 relay and Pulse relay can those be replaced by a random other relay? Or is it engine spec bindend ( Pulse module )I have one from a SLK 320 AUTOMATIC and 230K MANUAL. During this time, it underwent restyling. And have cleaned speed sensors on rear wheels. I’ve a Aug 28, 2007 · These have been added because they are difficult to lookup. So, any ideas which of the pictures Beranda Mercedes K40 Relay Wiring Diagram Mercedes K40 Relay Wiring Diagram Angie Swifirold Desember 25, 2021 MERCEDES BENZ ACTROS, ATEGO, ATRON, AXOR, LK, MK, SK, SPRINTER, UNIMOG, VARIO, ZETROS, W124, W140, W163 (ML320), W202, W210, W220 Wiring Diagrams MERCEDES ACTROS MERCEDES BENZ ACTROS Truck Wiring Diagrams ACTROS Nummek Units Wiring Diagram Relay module Traction systems fuse EDC / circuit 87 Motronik (2) fuse Circuit 87, Motronik (1) fuse. Replacing the fuse with a 20 A the engine starts and runs. Cette unité fournit une tension aux modules de commande et aux composants électriques, y compris la pompe à carburant, la pompe à air électrique et le klaxon. Understanding the fuse box diagram is essential for diagnosing and fixing electrical issues, whether you are a seasoned mechanic or a car enthusiast. E300. Well take a look . The yellow warning light keeps appearing although i changed the sensor and that's why i try to find the k 40 11 12 13 14 15 16 17 18 19 20 Find the wiring diagram for the K40 relay on the SLK 230. 99 Mercedes-Benz E300 TurbodieselReplacing K40 relay. They can be anywhere from 200 to 300 dollars. Nov 14, 2025 · Find many great new & used options and get the best deals for Mercedes R170 W210 SLK230 E320 E420 K40 OEM RELAY Stribel 2105400072 at the best online prices at eBay! Free shipping for many products! #impalamansgarage In part 2 we continue troubleshooting a no start condition on a W210 E320 Mercedes Estate (Station Wagon) by examining the K40 relay module and reviewing the service manual. Apr 20, 2023 · I have a 2001 E class 320. I replaced the whole module, but it was probably a failure of the relay controlling the fuel pump (2nd from left when viewed from the side with the fuses). This signal is used by the tach, the A/C compressor controller and the EGR Mar 13, 2017 · Look inside the module box, at the passenger side. I have just repaired mine. This unit provides voltage to the control modules and electrical components, including the fuel pump, electric air pump, and horn. If the neutral safety switch on the Jul 2, 2019 · Common issues: 1) fuses on the K40 relay module 2) K40 relay module itself (cracks, bad relay contacts, starter relay) 3) Starter 4)Ignition switch module (hope not, as it is expensive to fix) 5) Weak battery (voltage may be OK but not enough to start) 6) Preglow circuit faulty 7) Wiring / connector issues (with K40 mostly) SLK Class all Relays, Modules, Fuses, Locations, and Diagrams (R170 Mercedes)Video Contents:00:00 Intro01:02 R170 K40 Relay01:58 K40 Relay Wiring Diagram03:0 The Mercedes-Benz G-Class (W463) was produced from 1990 to 2018. any help would be thankful. 03. May 10, 2023 · I have tried to read through all the posts on this seemingly common problem but still have no idea how to test this relay for proper function. Normally, you would send them off or just go ahead and replace them. Sorry if have Electrical auto parts for Mercedes-Benz W140 S500 (1994-1999) 5. Find top brands, exclusive offers, and unbeatable prices on eBay. K40 Relay - Right hand drive LHD opposite Remove neg batt term Remove Jun 15, 2017 · There is another K40 relay / fuse panel at the driver's side (which is called K40/2) which is not relevant at this point. 14 L X22/12 X26/23 X26/25 X4 X99/14 Z7/24 Z7/36 Z7/6 Engine/chassis/ETC [EGS]connector Engine compartment/cockpit connector Engine/chassis connector (24-pin) Terminal block (circuit 30, fuse and relay box) (2-pin) REST [MRA]/BA or ESP intermediate connector Circuit 87 connector sleeve Circuit 87M2e connector sleeve Circuit 87 connector sleeve Full assignment of fuses and relays Mercedes 140 with box diagrams and their location. Can I get some direction as to how much one of these should cost as a part? Thanks in advance, Paul Nov 13, 2016 · Hi i have a 92 600sel with abs / asr lights on,do you remove the fuse box in order to get to relays underneath? Ive had car into mercedes repairer to sort issue but asr module not blinking as it uses blink code. . Found that ECU relay in K40 relay box didn't close. Get the information you need to troubleshoot and fix electrical issues on your Mercedes-Benz. 540. So, this is a The notorious K40 overload protection unit is a well-known cause of starting, idling, and engine stumbling problems. Fuel pump not pumping. Didn't crank after it and cooling fan blowing. This video is part of the investigation to find out why. Feb 25, 2010 · Hi folks, after some help with my ’97 W140 S320. Bought new K40 from htt E420 just cut off in mid drive and refused to start. Feb 13, 2013 · need to know where it's located on a 1997 sl600. The fuse is the second one from the left, between two other Here you will find fuse box diagrams of Mercedes-Benz E200, E220, E230, E240, E250, E270, E280, E290, E300, E320, E420, E36, E50, E55, E60 1996, 1997, 1998, 1999, 2000, 2001 and 2002, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay. Hit and miss on the reflow of these K40 issues. Oct 10, 2012 · The fault was the K40 relay module, as suspected. When I connect the 9v directly to the pins on the back of the PCB it operates. Shop now for fast shipping and easy returns! Mercedes 140 – Fuses and Relays Mercedes W140 is an S-class model of the German brand Mercedes Benz, which was produced in 1991, 1992, 1993, 1994, 1995, 1996, 1997 and 1998. My neighbor has a 1996 E320 sedan that he has asked for some help with. If you are certain that it is the relay, you might as well buy a replacement K40 which is about $100. dave.