Circuit Description
When the ignition is first turned to RUN, the EBCM goes through a self-test which lasts 2 to 4 seconds.
During the test, the EBCM grounds terminal 52. This causes the amber ANTILOCK indicator to light. This serves as an indicator bulb test.
When the fluid is low, the EBCM turns ON the amber ANTILOCK and TRACTION OFF indicators. The EBCM does not set a DTC.
A low fluid level condition usually lights the red BRAKE warning lamp, since the master cylinder supplies the BPMV reservoir. However, restrictions or air in the hose could cause a low fluid condition in the BPMV reservoir without lighting the red BRAKE warning lamp.
Diagnostic Aids
The following conditions may cause the ANTILOCK indicator to be on with no DTCs set:
| • | An open in any of the following circuits: |
| - | CKT 441 |
| - | CKT 800 |
| - | CKT 1451 |
| - | CKT 849 |
| - | CKT 853 |
| • | A low brake fluid level |
| • | An open BPMV fluid level switch circuit |
| • | A short to ground in any of the following circuits: |
| - | CKT 441 |
| - | CKT 800 |
| - | CKT 852 |
Test Description
The numbers below refer to step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
DEFINITION: The ABS indicator does not turn off after the instrument panel cluster (IPC) bulb check and no ABS/TCS DTC(s) set. | ||||
1 | Was the ABS Diagnostic System Check performed? | -- | ||
Using a scan tool in the Instrument Panel Cluster Special Functions attempt to turn off the ABS indicator. Did the ABS indicator turn off? | -- | |||
3 | Replace the EBCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the replacement complete? | -- | -- | |
4 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the replacement complete? | -- | -- | |
