Circuit Description
The instrument panel cluster (IPC) illuminates the ABS indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends class 2 serial data messages to the IPC in order to command the indicator ON or OFF.
Diagnostic Aids
The malfunction must be present during diagnosis in order to prevent unnecessary parts replacement. Always begin diagnosis with Diagnostic System Check - Vehicle in Vehicle DTC Information.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
|
Important: After a wheel speed sensor DTC is cleared and the ignition is ON, the ABS indicator may remain ON until the electronic brake control module (EBCM) completes a power-up self test. This test concludes when the vehicle reaches a speed greater than 13 km/h (8 mph) and the wheel speeds are verified by the EBCM. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the ABS indicator illuminate for 2 seconds and then turn OFF? | Go to Diagnostic Aids | Go to Step 3 |
Does the ABS indicator turn OFF? | Go to Step 5 | Go to Step 4 | |
4 | Replace the instrument panel cluster. Refer to Control Module References in Computer/Integrating Systems. Did you complete the replacement? | Go to Step 6 | -- |
5 |
Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems. Did you complete the replacement? | Go to Step 6 | -- |
6 |
Does the ABS indicator illuminate for 2 seconds and then turn OFF? | System OK | Go to Step 3 |
