Circuit Description
The EBCM controls ABS indicator illumination by supplying ground to the ABS indicator failure control circuit. The ABS indicator failure control circuit has a feedback path to the EBCM microprocessor. The feedback voltage is low when the indicator is commanded on.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The ABS indicator failure control circuit feedback voltage is high when the ABS indicator is commanded on.
Action Taken When the DTC Sets
If an ABS disabling DTC sets, the EBCM illuminates the BRAKE indicator.
Conditions for Clearing the DTC
| • | Repair the condition(s) responsible for setting the DTC. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent Conditions and Poor Connections , Connector Repairs and Wiring Repairs in Wiring Systems.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | ||||
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Does the DTC set? | -- | Go to Step 3 | Go to Diagnostic Aids |
3 |
Does the DTC set? | -- | Go to Step 5 | Go to Step 4 |
4 | Replace the instrument panel cluster. Refer to Instrument Cluster Bulb Replacement in Instrument Panel, Gauges and Console. Did you complete the replacement? | Go to Step 8 | -- | |
5 | Test the ABS indicator lamp control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Important: Perform the Tire Size Calibration procedure. Refer to Scan Tool Diagnostics Did you complete the replacement? | -- | Go to Step 8 | -- |
8 | Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? | -- | Go to Step 3 | System OK |
