Service Traction System and ABS light
Thread Starter
Heel & Toe
Joined: Feb 2012
Posts: 23
Likes: 0
Service Traction System and ABS light
For the past few years, the "Service traction System and ABS" lights would turn on intermittently on my 2003 Z06. I noticed that they usually came on when the battery voltage was a bit low due to non use. Now, the lights are constantly on and blinking, unless I hit the Reset button. There are no error codes showing and everything is working well. What gives? Any suggestions will be greatly appreciated. 
Pro
Joined: Nov 2002
Posts: 717
Likes: 11
From: Pleasanton CA
For the past few years, the "Service traction System and ABS" lights would turn on intermittently on my 2003 Z06. I noticed that they usually came on when the battery voltage was a bit low due to non use. Now, the lights are constantly on and blinking, unless I hit the Reset button. There are no error codes showing and everything is working well. What gives? Any suggestions will be greatly appreciated.
https://www.corvetteforum.com/forums...ch-repair.html
https://www.corvetteforum.com/forums...-repair-3.html
Last edited by 1KLRTOY; Jan 25, 2017 at 04:04 PM.
Thread Starter
Heel & Toe
Joined: Feb 2012
Posts: 23
Likes: 0
DIC codes
Do you just expect the error codes to pop up in the DIC????? Or did you activelypll the codes???
I strongly suspect the latter because is the dash lights for ABS are illuminated there WILL be codes set.
https://www.youtube.com/watch?v=SviRjIsy9G4
OR
http://www.c5forum.com/ayc/dtcdic.php
Pull and post ALL your codes including the H or C or HC that follow each 5 character code.
List the codes under the sensor they are associated with. ie 10 - PCM or 28 - TCS or 40 - BCM.............etc
ABS codes will appear under 28 - TCS.
I strongly suspect the latter because is the dash lights for ABS are illuminated there WILL be codes set.
https://www.youtube.com/watch?v=SviRjIsy9G4
OR
http://www.c5forum.com/ayc/dtcdic.php
Pull and post ALL your codes including the H or C or HC that follow each 5 character code.
List the codes under the sensor they are associated with. ie 10 - PCM or 28 - TCS or 40 - BCM.............etc
ABS codes will appear under 28 - TCS.
I had previously only checked for codes via OBD. I had never accessed the DIC until now. The video was very helpful. The only current code I have is 28 TCS C1214 H C. The few other codes that appeared were history.
Now I just need to figure out what the C1214 is telling me. Any ideas?
Thanks!
Thread Starter
Heel & Toe
Joined: Feb 2012
Posts: 23
Likes: 0
Thread Starter
Heel & Toe
Joined: Feb 2012
Posts: 23
Likes: 0
Might want to check your ignition switch, the contacts burn and cause all sorts of issues.
https://www.corvetteforum.com/forums...ch-repair.html
https://www.corvetteforum.com/forums...-repair-3.html
https://www.corvetteforum.com/forums...ch-repair.html
https://www.corvetteforum.com/forums...-repair-3.html
Good suggestion.
Thanks!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The over the counter code scanners most of the times will not show you Body related (B) OR Chassis related (C) codes. The DIC will!You also need to know that the EBTCM will "CLEAR /RESET" most of the displayed DTCs at each ignition cycle. You really need to read the DTCs at the time of the messages when they appear in the DIC.
Just press RESET to clear those messages and then go directly into trading the DTCs "WITH OUT TURNING OFF THE IGNITION" That will allow you to see every DTC that is currently set.
Hell, If I'm driving my Z and the car glitches the least bit, I immediately pull up the codes while I'm driving and see what's up.
I always try to keep all my DTCs cleared. That way, if something pops up, I know it was recent.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Oh,,, That 1214 DTC is: DTC C1214 System Relay Contact or Coil Circuit Open
The POWER RELAY inside the EBTCM is defective OR one of the coil solder joints is cold soldered.
You need to remove the EBTCM from the BPMV (Brake Pump Motor Valve) and send the module the EBTCM to one of the ABS Fixer people. They will replace the relay and do some improvements to that circuit. Cost around $150.
The module on the right is the EBTCM.
The white relay is the one that causing the issues:
You can pull the EBTCM off of the BPMV without removing the BPMV from the car. BE CAREFUL when you separate the EBTCM from the BPMV. Pop it straight off or you will break the coils off of the board. Then it becomes a desk ornament.
BC
The POWER RELAY inside the EBTCM is defective OR one of the coil solder joints is cold soldered.
You need to remove the EBTCM from the BPMV (Brake Pump Motor Valve) and send the module the EBTCM to one of the ABS Fixer people. They will replace the relay and do some improvements to that circuit. Cost around $150.
The module on the right is the EBTCM.
The white relay is the one that causing the issues:
You can pull the EBTCM off of the BPMV without removing the BPMV from the car. BE CAREFUL when you separate the EBTCM from the BPMV. Pop it straight off or you will break the coils off of the board. Then it becomes a desk ornament.
BC
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Thread Starter
Heel & Toe
Joined: Feb 2012
Posts: 23
Likes: 0
The over the counter code scanners most of the times will not show you Body related (B) OR Chassis related (C) codes. The DIC will!You also need to know that the EBTCM will "CLEAR /RESET" most of the displayed DTCs at each ignition cycle. You really need to read the DTCs at the time of the messages when they appear in the DIC.
Just press RESET to clear those messages and then go directly into trading the DTCs "WITH OUT TURNING OFF THE IGNITION" That will allow you to see every DTC that is currently set.
Hell, If I'm driving my Z and the car glitches the least bit, I immediately pull up the codes while I'm driving and see what's up.
I always try to keep all my DTCs cleared. That way, if something pops up, I know it was recent.
Thanks for the information. The only code I could not clear is C1214 H C, because it is a current code. That's the next hurdle.
Thread Starter
Heel & Toe
Joined: Feb 2012
Posts: 23
Likes: 0
Dtc c1214
Oh,,, That 1214 DTC is: DTC C1214 System Relay Contact or Coil Circuit Open
The POWER RELAY inside the EBTCM is defective OR one of the coil solder joints is cold soldered.
You need to remove the EBTCM from the BPMV (Brake Pump Motor Valve) and send the module the EBTCM to one of the ABS Fixer people. They will replace the relay and do some improvements to that circuit. Cost around $150.
The module on the right is the EBTCM.
The white relay is the one that causing the issues:
You can pull the EBTCM off of the BPMV without removing the BPMV from the car. BE CAREFUL when you separate the EBTCM from the BPMV. Pop it straight off or you will break the coils off of the board. Then it becomes a desk ornament.
BC
The POWER RELAY inside the EBTCM is defective OR one of the coil solder joints is cold soldered.
You need to remove the EBTCM from the BPMV (Brake Pump Motor Valve) and send the module the EBTCM to one of the ABS Fixer people. They will replace the relay and do some improvements to that circuit. Cost around $150.
The module on the right is the EBTCM.
The white relay is the one that causing the issues:
You can pull the EBTCM off of the BPMV without removing the BPMV from the car. BE CAREFUL when you separate the EBTCM from the BPMV. Pop it straight off or you will break the coils off of the board. Then it becomes a desk ornament.
BC
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I 100% agree with the information that Bill has provided you~!!!!
However, if it were my car with the C1214 code, I would be checking out a few things before I pulled the EBCM out and went in after the main power relay in it. It would also be good if you had posted the other codes that you mentioned in post #5 that were H code. H codes should NOT be ignored. They can be a very helpful audit trail of other issues that have occurred.
There have been more than a few C1214 issues corrected by finding an issue with the power path to the EBCM. Items like a bad ignition switch that is between the battery and the EBCM, bad ground path to the EBCM, damaged or corroded contacts surfaces on the connector at the EBCM, or bad fuse. If you had a bunch of RDCM and or LDCM codes that were H that could indicate a low battery related issue. The EBCM like several other pieces of electronics in the C5 go through diagnostic an initialization process when the key is turned to the ON position. If battery voltage is low those can fail and set the codes because having voltage after the car is running and the alternator producing voltage is TOO LATE.... I would be checking those before I did anything else. If I went and pulled the EBCM and sent it off for repair and reinstalled it only to find I still had the C1214, I would be pi$$$$$$$ed.
I bet that Bill has the wiring diagram for the EBCM that he can post to get you started on checking the electrical path.
Here is a link on how to check out the ignition switch:
diagnosis
http://forums.corvetteforum.com/1568186703-post64.html
JMHO
However, if it were my car with the C1214 code, I would be checking out a few things before I pulled the EBCM out and went in after the main power relay in it. It would also be good if you had posted the other codes that you mentioned in post #5 that were H code. H codes should NOT be ignored. They can be a very helpful audit trail of other issues that have occurred.
There have been more than a few C1214 issues corrected by finding an issue with the power path to the EBCM. Items like a bad ignition switch that is between the battery and the EBCM, bad ground path to the EBCM, damaged or corroded contacts surfaces on the connector at the EBCM, or bad fuse. If you had a bunch of RDCM and or LDCM codes that were H that could indicate a low battery related issue. The EBCM like several other pieces of electronics in the C5 go through diagnostic an initialization process when the key is turned to the ON position. If battery voltage is low those can fail and set the codes because having voltage after the car is running and the alternator producing voltage is TOO LATE.... I would be checking those before I did anything else.
If I went and pulled the EBCM and sent it off for repair and reinstalled it only to find I still had the C1214, I would be pi$$$$$$$ed.I bet that Bill has the wiring diagram for the EBCM that he can post to get you started on checking the electrical path.
Here is a link on how to check out the ignition switch:
diagnosis
http://forums.corvetteforum.com/1568186703-post64.html
JMHO
Excellent recommendation.. Thanks for the back-up.
