2004 electric problem
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CLK 270CDi
2004 electric problem
Hi,
I have a clk 270 cdi 2004 and recently I have some issues...
1. Sometimes when I unlock the car with remote key it unlocks and 2 sec after locks (I note that this happens first time in the morning or when is stopped for a while)
2. During run sometimes it unlocks (or locks) the doors and turn signals blinks two or three times
3. During run the four turn signals start flashing and I have to press the button to stop it.
Somebody could help me??
I have a clk 270 cdi 2004 and recently I have some issues...
1. Sometimes when I unlock the car with remote key it unlocks and 2 sec after locks (I note that this happens first time in the morning or when is stopped for a while)
2. During run sometimes it unlocks (or locks) the doors and turn signals blinks two or three times
3. During run the four turn signals start flashing and I have to press the button to stop it.
Somebody could help me??
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Looking at the block diagrams, that's the only electronic part in common. Well, the EIS is involved, too, but I doubt it's that. The SAMs seem to be prone to failure when are voltage fluctuations. Speaking of which, if your battery and/or alternator are bad, you can have all sorts of electrical gremlins. What's the resting and running voltage on the system?
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CLK 270CDi
Almost two years pass and the problems continue.
But since now I'm using the car everyday this problems are driving me crazy...
More problems appear meanwhile... Dashboard sometimes blinks all lights and then I get the error replace key. I tried to use the 2nd key and the problem continues.
The unlock and lock during running is getting worst.
Will try to do a video.
But since now I'm using the car everyday this problems are driving me crazy...
More problems appear meanwhile... Dashboard sometimes blinks all lights and then I get the error replace key. I tried to use the 2nd key and the problem continues.
The unlock and lock during running is getting worst.
Will try to do a video.
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From: Lebanon
2007 BMW 550i
Rodney is probably right, looks like its most probably your rear sam. On my old c class the rear license plate lights would turn on for 5 seconds then off for another 5 then the cycle repeats. Changed the rear sam, problem gone. Also checkout some of the threads on the site again. there is a fix for the headrest thats simple and theoretically involves no money.
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My suggestion is to always get a proper diagnosis. The dealer's SDS (Star Diagnosis System) can pull codes from system (like the SAMs) that generic OBDII scanner cannot. If you can;t get the codes, then you are resigned to "throwing parts at it".
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CLK 270CDi
I have a generic obd scanner but I can access to almost all modules of the car, including the rear SAM... It had some errors that I could delete but later on I will connect again to check if they come back.
Most of the errors I have registered are related with OCP module. Intermittent connection failure... And the thing is, I can't access to the OCP module.
Some time ago I tried with a star das and wasn't possible to access it too, so we assumed that the problem was that module. But after that I tried with two other ocp modules and the problem persists...
Thanks
Most of the errors I have registered are related with OCP module. Intermittent connection failure... And the thing is, I can't access to the OCP module.
Some time ago I tried with a star das and wasn't possible to access it too, so we assumed that the problem was that module. But after that I tried with two other ocp modules and the problem persists...
Thanks
Last edited by LOB; Apr 29, 2015 at 05:50 AM.
Super Member
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From: Lebanon
2007 BMW 550i
A generic OBD scanner cant access modules specific to our car such as the REAR SAM or TCU. You will need STAR. As with the OCP module, I'm not sure about this, but i'm guessing the rear SAM is the module that talks to the OCP module.
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CLK 270CDi
I had a misspelling error on my last post (edited now). What I wanted to say is that I CAN access the REAR SAM with my obd interface as well the TCU... If is the rear sam that talks with OCP maybe it's indeed a defective rear sam...
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From: Lebanon
2007 BMW 550i
Well i'm guessing at this point. I dont know much about how the system works. But what puzzles me is how your generic OBDII scanner can access the rear sam and tcu! what brand of OBDII reader are you using? I once used a Launch X431 Pad and it was able to access all the modules except front sam and read sam and ocp, and thats a 1000$+ scanner.
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CLK 270CDi
Error on REAR SAM:
B1090 (Permanent): Fault in CAN communication with control unit OCP .If fault code occurs with no complaint reported and no malfunctions, erase fault memory and perform a
function check
Error on FRONT SAM:
B1031 (Permanent): Control module OCP is not transmitting any data.If fault code occurs with no complaint reported and no malfunctions, erase fault memory and perform a
function check
It seams that any module could connect with OCP.
No errors related with EIS
B1090 (Permanent): Fault in CAN communication with control unit OCP .If fault code occurs with no complaint reported and no malfunctions, erase fault memory and perform a
function check
Error on FRONT SAM:
B1031 (Permanent): Control module OCP is not transmitting any data.If fault code occurs with no complaint reported and no malfunctions, erase fault memory and perform a
function check
It seams that any module could connect with OCP.
No errors related with EIS
Super Member
Joined: Mar 2010
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From: Lebanon
2007 BMW 550i
Thats weird. Logically I'd say your OCP Module is shot. But you already tried to fit in a different unit. After you fitted the unit did you reset the codes? Maybe thats the reason it didn't work? Btw the key function problems you were having are managed by the rear sam. So this is all a bit weird!
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From: Lebanon
2007 BMW 550i
No idea really, if i were you i'd search for some articles or pdf files online about how the CANBUS system communicates. Maybe its something as simple as a break in a wire somewhere?
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Check the pins on the wiring harness to make sure nothing is bent or dislodged. Otherwise, it sounds like you may need to trace the CAN bus wiring. It will be a brown wire with a colored tracer. Oh, one other thing to check - there is a CAN bus junction under the driver's door sill, inside the plastic wiring raceway. You can't miss it - a block with lots of brown wires in it. Make sure it's not corroded. Water can get in there and oxidize the wiring.
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CLK 270CDi
Check the pins on the wiring harness to make sure nothing is bent or dislodged. Otherwise, it sounds like you may need to trace the CAN bus wiring. It will be a brown wire with a colored tracer. Oh, one other thing to check - there is a CAN bus junction under the driver's door sill, inside the plastic wiring raceway. You can't miss it - a block with lots of brown wires in it. Make sure it's not corroded. Water can get in there and oxidize the wiring.
Thanks DanielFD too.
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I wonder if this is an issue with the key losing communication with the EIS? Here's an interesting thread:
http://www.benzworld.org/forums/w203...is-issues.html
http://www.benzworld.org/forums/w203...is-issues.html
Thread Starter
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CLK 270CDi
I wonder if this is an issue with the key losing communication with the EIS? Here's an interesting thread:
http://www.benzworld.org/forums/w203...is-issues.html
http://www.benzworld.org/forums/w203...is-issues.html
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I believe this is a CAN bus issue. You could have a bad connection, or it could be a device on the bus that is spewing "trash" on the network and confusing the other devices. This is going to be very difficult to find. SDS has an optional CAN bus "sniffer", but honestly, few techs at the dealers know how to use it. I am not aware of any aftermarket devices that will do this, but maybe there is something out there.
One easy thing I can tell you to check is the main CAN bus terminal. It's located under the driver side door sill. Water leaks can infiltrate this and cause corrosion. Steps 1-4 in this documentation will get you there:
http://www.mods4cars.com/sms/db/smar...all_clk/en.php
One easy thing I can tell you to check is the main CAN bus terminal. It's located under the driver side door sill. Water leaks can infiltrate this and cause corrosion. Steps 1-4 in this documentation will get you there:
http://www.mods4cars.com/sms/db/smar...all_clk/en.php
