Circuit Description
The ABS Indicator driver circuit runs from the Instrument Panel Cluster (IPC) through the brake lamp driver module to the EBCM/EBTCM. The IPC supplies voltage to the ABS indicator. The EBCM/EBTCM controls the ABS indicator through the brake lamp driver module. The brake lamp driver module acts as an inverter; when the EBCM/EBTCM supplies a ground for the brake lamp driver module, the indicator remains off. When the EBCM/EBTCM removes the ground for the brake lamp driver module, the indicator turns on by using the ground at the brake lamp driver module terminal D.
Conditions for Setting the DTC
EBCM/EBTCM commands the ABS indicator on and either an open, a short to ground, or a short to voltage is detected in CKT 852.
Action Taken When the DTC Sets
The DTC is stored, but the ABS is not disabled.
Conditions for Clearing the MIL/DTC
| • | The condition for DTC is no longer present and the scan tool clear DTC function is used. |
| • | 50 ignition cycles have passed with no DTCs detected. |
Diagnostic Aids
Perform a thorough inspection of the wiring and connectors. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
This step checks if CKT 852 is shorted to voltage.
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This step checks if CKT 852 is shorted to ground.
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This step checks for an open in CKT 852.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check |
Is the voltage within the specified range? | Battery Voltage | Go to Step 3 | Go to Step 4 | |
3 | Repair CKT 852 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
Is the resistance equal to the specified value? | OL (infinite) | Go to Step 6 | Go to Step 5 | |
5 | Repair CKT 852 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
Is the resistance less than the specified value? | 5 ohms | Go to Step 7 | Go to Step 8 | |
7 | Replace the EBCM/EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
8 | Repair an open or high resistance in CKT 852. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
