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| diehardg Veteran  Date registered: May 2006 Location: Tokyo, Japan Vehicle(s): 2000G500L, 2015 G350BT, 2016G63(now), 1968 S404 Posts: 220  | A210 540 00 74 Relay Unit I recently replaced this on my G. Does anyone know what this does?? Number 5 on the picture. Long story short,,,,, Engine starter sometime did not turn on my G. So, I took my G to dealer and they replaced starter and relay. Starter still failed when hot. Even worse, engine stopped when idling. So, I took it to dealer again and they finally identified the issue and replaced this relay unit. They told me that this is controlling starter. On this relay unit, there are 5 or 6 15A fuses and one big 40A fuse. So, it's obviously controling some kind of electric power. I'm wondering if this really fixed all the issues. All of the issue was not identifiable by MB computer diagnose. Thanks. Yasu Edited by diehardg 6/9/2007 12:35 PM (A210 540 00 72.jpg) Attachments ----------------  A210 540 00 72.jpg (67KB - 6 downloads) | |
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| 4x4abc Date registered: Apr 2006 Location: La Paz, Baja California, Mexico Vehicle(s): 02 G500  | ||
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| DUTCH Administrator Doppelgänger Date registered: Apr 2006 Location: US, GA, Atlanta Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter Posts: 9963 | RE: A210 540 00 74 Relay Unit diehardg - 6/9/2007 12:31 PM I recently replaced this on my G. Does anyone know what this does?? Number 5 on the picture. That's the K40 Relay Module which Braingears just replaced on his W463. Take a look at the attached PDF. As you can see, it controls a lot of stuff; and the failure is fairly common. Attachments ---------------- K40_Relay.pdf (109KB - 51 downloads) | |
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| diehardg Veteran Date registered: May 2006 Location: Tokyo, Japan Vehicle(s): 2000G500L, 2015 G350BT, 2016G63(now), 1968 S404 Posts: 220 | ||
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| diehardg Veteran Date registered: May 2006 Location: Tokyo, Japan Vehicle(s): 2000G500L, 2015 G350BT, 2016G63(now), 1968 S404 Posts: 220 | RE: A210 540 00 74 Relay Unit DUTCH - 6/10/2007 1:45 AM diehardg - 6/9/2007 12:31 PM I recently replaced this on my G. Does anyone know what this does?? Number 5 on the picture. That's the K40 Relay Module which Braingears just replaced on his W463. Take a look at the attached PDF. As you can see, it controls a lot of stuff; and the failure is fairly common. DUTCH, Thanks for the info as always. I need to print this out to understand clearly but it does lots of jobs for sure... This should have been easy fix if identfied easily  Hope other members here will not experience the same as I did... Yasu | |
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| 4x4abc Date registered: Apr 2006 Location: La Paz, Baja California, Mexico Vehicle(s): 02 G500 | ||
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| DUTCH Administrator Doppelgänger Date registered: Apr 2006 Location: US, GA, Atlanta Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter Posts: 9963 | ||
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| fernweh Date registered: Apr 2006 Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa  | RE: A210 540 00 74 Relay Unit diehardg - 6/9/2007 10:08 AM DUTCH - 6/10/2007 1:45 AM diehardg - 6/9/2007 12:31 PM I recently replaced this on my G. Does anyone know what this does?? Number 5 on the picture. That's the K40 Relay Module which Braingears just replaced on his W463. Take a look at the attached PDF. As you can see, it controls a lot of stuff; and the failure is fairly common. DUTCH, Thanks for the info as always. I need to print this out to understand clearly but it does lots of jobs for sure... This should have been easy fix if identfied easily Hope other members here will not experience the same as I did... Yasu As per Dutch's pdf you can easily troubleshoot some of the K40 action. Fuses K40f1(15A), f5(15A), f6(15A) and f4(40A) should be always hot / +12Volt Turning on Ignition (S2/1) it should activate K40k5 (diff lock relay) check for +12V on Connector C/Pin 4&5 Turning on Ignition (S2/1) it should activate K40k9 (engine 87 M1/M2 relay) check for +12V on Connector E/5&6, A/1&3 and/or at fuse K40f2 & f3 to test the Fuel pump relay and others you might have to remove K40 and set-up a little test harness, as I do not know if you can remove the individual K40 connectors separately and get to the pins as needed. If you want me to, I can write up a short test sequence for the K40 relay - using just some single wires with connectors, a 12V battery and a test lamp Karl | |
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| DUTCH Administrator Doppelgänger Date registered: Apr 2006 Location: US, GA, Atlanta Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter Posts: 9963 | RE: A210 540 00 74 Relay Unit fernweh - 6/9/2007 4:38 PM If you want me to, I can write up a short test sequence for the K40 relay - using just some single wires with connectors, a 12V battery and a test lamp Karl That would be very handy to have.  | |
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| fourbyfourclub Extreme Veteran Date registered: Apr 2006 Location: New Jersey, USA Vehicle(s): 300G Posts: 302  | ||
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| DUTCH Administrator Doppelgänger Date registered: Apr 2006 Location: US, GA, Atlanta Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter Posts: 9963 | RE: A210 540 00 74 Relay Unit fourbyfourclub - 6/9/2007 6:23 PM We sell "old style" 210 540 00 72 (up to end of 1996) for $89.00 and "new style" 210 540 00 72 (from model year 1997) for $102.00 I don't think is tooo expensive to keep it as a spare and fell yourself comfortable away from your friendly Mercedes service. Vlad, Are both the old and new the same part number?  | |
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| fourbyfourclub Extreme Veteran Date registered: Apr 2006 Location: New Jersey, USA Vehicle(s): 300G Posts: 302 | ||
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| fernweh Date registered: Apr 2006 Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa | ||
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| DUTCH Administrator Doppelgänger Date registered: Apr 2006 Location: US, GA, Atlanta Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter Posts: 9963 | ||
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