Need Quick Answer Code Description
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
Need Quick Answer Code Description
My 02 Z is in the shop at the moment for door lock and unlock issues and shows 2 thrown codes. Can somebody please give me a description of each. AO-LDCM U1064H
A1-RDCM-U1064H
A1-RDCM-U1064H
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
The U1064 code is being flagged for both the left (LDCM) and the right (RDCM) door control modules.
The module sends a "health warning every 2 seconds. When no signal is received the DTC is set.
As a first step I'd reset the code on the DIC. U codes can be caused by power/battery spikes. It may reset and clear the problem.
If not try the connector in the door jamb to make sure its seated properly. If not there's probably a snag with the module. That said, both flags for both door modules at the same time is unusual.
The module sends a "health warning every 2 seconds. When no signal is received the DTC is set.
As a first step I'd reset the code on the DIC. U codes can be caused by power/battery spikes. It may reset and clear the problem.
If not try the connector in the door jamb to make sure its seated properly. If not there's probably a snag with the module. That said, both flags for both door modules at the same time is unusual.
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
The U1064 code is being flagged for both the left (LDCM) and the right (RDCM) door control modules.
The module sends a "health warning every 2 seconds. When no signal is received the DTC is set.
As a first step I'd reset the code on the DIC. U codes can be caused by power/battery spikes. It may reset and clear the problem.
If not try the connector in the door jamb to make sure its seated properly. If not there's probably a snag with the module. That said, both flags for both door modules at the same time is unusual.
The module sends a "health warning every 2 seconds. When no signal is received the DTC is set.
As a first step I'd reset the code on the DIC. U codes can be caused by power/battery spikes. It may reset and clear the problem.
If not try the connector in the door jamb to make sure its seated properly. If not there's probably a snag with the module. That said, both flags for both door modules at the same time is unusual.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
The codes are definitely for the door control modules. What I cant work out is why both would throw codes at the same time. They are powered independently. Often one goes bad and you have problems on that side. At other times its the connector in the door hinge. That way only one module should be affected and only one side go bad. If both are throwing codes it suggests its upstream of the modules where the two functions come together.
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
The codes are definitely for the door control modules. What I cant work out is why both would throw codes at the same time. They are powered independently. Often one goes bad and you have problems on that side. At other times its the connector in the door hinge. That way only one module should be affected and only one side go bad. If both are throwing codes it suggests its upstream of the modules where the two functions come together.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
The drivers door module is grounded at G201, pax at G202. Worth cleaning them I'd say.
Fuses are 30/31(right) 33/34 (left) on the pax panel.
I'd also check the connectors in the door hinge for a good connection. It could be both causing problems at the same time I guess.
Fuses are 30/31(right) 33/34 (left) on the pax panel.
I'd also check the connectors in the door hinge for a good connection. It could be both causing problems at the same time I guess.
Last edited by DeeGee; Jan 29, 2008 at 04:37 PM.
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Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Pull back the rubber gaiter in the door hinge and pull the blue connectors apart. Spray them with electrical cleaner and reseat them firmly. See it that fixes it. If not, check the two grounds for corrosion and if necessary clean them up then see how you go.
All that said, it could be 2 bad modules.
Last edited by DeeGee; Jan 29, 2008 at 04:48 PM.
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
The power feeds straight to the door modules via seperate fuses. They are 2 independent circuits. It could be both door modules bad at the same time but that would be unusual. I'd come back to the fact that U codes normally seem to be power related namely a spike or loss of power. thats why I think its more likely to be grounds or connectors.
Pull back the rubber gaiter in the door hinge and pull the blue connectors apart. Spray them with electrical cleaner and reseat them firmly. See it that fixes it. If not, check the two grounds for corrosion and if necessary clean them up then see how you go.
All that said, it could be 2 bad modules.
Pull back the rubber gaiter in the door hinge and pull the blue connectors apart. Spray them with electrical cleaner and reseat them firmly. See it that fixes it. If not, check the two grounds for corrosion and if necessary clean them up then see how you go.
All that said, it could be 2 bad modules.
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
UPDATE:The dealer just called and are going to replace both the left and right door control modules. I mentioned to check both actuator connections as well. Should get the car back Wed or Thu I'll post back.
Thread Starter
Melting Slicks
Joined: Dec 2002
Posts: 2,061
Likes: 1
From: Valley Village CA
Got the car back today with new left and right door modules. The locks work great. They open and close with more force than before. So far so good I'm happy. Thanks for your help.Greg