Circuit Description
The EBCM illuminates the ABS indicator by supplying ground to the lamp . When the ABS indicator is commanded ON, the feedback voltage to the EBCM from the ABS indicator failure control circuit is low.
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests if the EBCM is applying ground to the ABS indicator lamp.
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This step tests the ABS indicator failure control circuit for a short to ground by substituting the instrument panel cluster and the ABS indicator lamp with a test lamp while leaving the EBCM disconnected.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | |
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 illuminate? | Go to Step 4 | Go to Step 7 | |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 6 | |
5 | Repair the short to ground in the ABS indicator failure control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 8 | -- |
6 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 8 | -- |
7 |
Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | Go to Step 8 | -- |
8 |
Does the ABS indicator illuminate for 2 seconds and then turn OFF? | System OK | Go to Step 3 |
