Diagnostic Code Assistance?
Thread Starter
Instructor
Joined: Aug 2002
Posts: 226
Likes: 0
From: St. Charles IL
Diagnostic Code Assistance?
Hey all-
I've been having some issues with some electronics components in my 2001 Coupe and was hoping to get some assistance. There have been issues with everything from the drivers side power seat, telescoping wheel, radio, Traction Control and even in starting the car from time to time.
I've done nothing aftermarket to the car except for swapping out the air filter. I pulled the diagnostic codes on the car for the first time today and came back with those that you see at the bottom of this post. I already looked up the description of the codes and input them below but was looking for any other decription people might be able to add.
I was hoping someone could give some color as to what might be causing some of these issues or any experiences people have had with fixing some of them personally. I noticed some corrosion on my main battery cable (positive) and will obviously start looking there. Thanks in advance for your input.
40-BCM
B0432 H - Rear Defogger Relay Circuit
B0503 H - RH DRL Relay Cicruit
B0508 H - LH DRL Relay Circuit
B2483 H - Backup Lamp Relay Circuit
B2528 H - Horn Relay Circuit
B2588 H - Column Lock/Unlock Drive (A)
B2593 H -
A0-LDCM
B2282 H - Battery #1 Fault DCM-LEFT
B2284 H - Battery #2 Fault DCM-LEFT
U1064 H - Loss Of Communication with DCM (No SOH Message Received - RFA
A1-RDCM
B2283 H - Battery #1 Fault DCM-RIGHT
B2285 H - Battery #2 Fault DCM-RIGHT
U1064 H - Loss Of Communication with DCM (No SOH Message Received - RFA
A6-SCM NO COMM.
B0-RFA
U1255 H - Serial Data Line Malfunction - RFA
I've been having some issues with some electronics components in my 2001 Coupe and was hoping to get some assistance. There have been issues with everything from the drivers side power seat, telescoping wheel, radio, Traction Control and even in starting the car from time to time.
I've done nothing aftermarket to the car except for swapping out the air filter. I pulled the diagnostic codes on the car for the first time today and came back with those that you see at the bottom of this post. I already looked up the description of the codes and input them below but was looking for any other decription people might be able to add.
I was hoping someone could give some color as to what might be causing some of these issues or any experiences people have had with fixing some of them personally. I noticed some corrosion on my main battery cable (positive) and will obviously start looking there. Thanks in advance for your input.
40-BCM
B0432 H - Rear Defogger Relay Circuit
B0503 H - RH DRL Relay Cicruit
B0508 H - LH DRL Relay Circuit
B2483 H - Backup Lamp Relay Circuit
B2528 H - Horn Relay Circuit
B2588 H - Column Lock/Unlock Drive (A)
B2593 H -
A0-LDCM
B2282 H - Battery #1 Fault DCM-LEFT
B2284 H - Battery #2 Fault DCM-LEFT
U1064 H - Loss Of Communication with DCM (No SOH Message Received - RFA
A1-RDCM
B2283 H - Battery #1 Fault DCM-RIGHT
B2285 H - Battery #2 Fault DCM-RIGHT
U1064 H - Loss Of Communication with DCM (No SOH Message Received - RFA
A6-SCM NO COMM.
B0-RFA
U1255 H - Serial Data Line Malfunction - RFA
Burning Brakes
Joined: Dec 2003
Posts: 1,066
Likes: 9
From: Eddy Texas
Well, they are all "H" history codes which could have been accumulating for a while. May have some wiring issues in one of the door harnesses, moisture on the BCM, or even a battery problem. Any of those is no big deal to fix. I would clear all of the codes and drive it a day or two and see what comes back. There are a lot of "gliches" that will throw a code once and never return. Clear 'em out and recheck after some driving and repost what's back up.
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Well, they are all "H" history codes which could have been accumulating for a while. May have some wiring issues in one of the door harnesses, moisture on the BCM, or even a battery problem. Any of those is no big deal to fix. I would clear all of the codes and drive it a day or two and see what comes back. There are a lot of "gliches" that will throw a code once and never return. Clear 'em out and recheck after some driving and repost what's back up.
Thread Starter
Instructor
Joined: Aug 2002
Posts: 226
Likes: 0
From: St. Charles IL
I've cleared the codes and taken the car on a few short drives. The only code that has returned is:
A6-SCM NO COMM.
My seat, column and door locks still do not work. I seem to remember reading somewhere that the SCM controls the telescoping column so that would make sense and I read an article about a relay in the Door Control Module that seems like it may be the problem. Anyone have any suggestions on troubleshooting the SCM error above?
A6-SCM NO COMM.
My seat, column and door locks still do not work. I seem to remember reading somewhere that the SCM controls the telescoping column so that would make sense and I read an article about a relay in the Door Control Module that seems like it may be the problem. Anyone have any suggestions on troubleshooting the SCM error above?
