The electronic brake control module (EBCM) receives a signal from the trailer Antilock Brake System (ABS) module over the ignition 1 voltage circuit. The EBCM applies ground to the trailer ABS indicator control circuit in order to turn ON the TRAILER ABS indicator.
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Air Antilock Brake System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Disconnect the trailer from the vehicle. Does the TRAILER Antilock Brake System (ABS) indicator turn OFF? | The problem is with the trailer. Refer to the trailer manufacturer. | Go to Step 3 | |
3 | Disconnect the electronic brake control module (EBCM). Does the TRAILER ABS Indicator turn OFF? | Go to Step 6 | Go to Step 4 |
4 |
Did you find and correct the condition? | Go to Step 7 | Go to Step 5 |
5 | Replace the telltale circuit board. Refer to Telltale Circuit Board Replacement . Did you complete the repair? | Go to Step 7 | -- |
6 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the TRAILER ABS Indicator turn ON? | Go to Step 2 | System OK |