Circuit Description
The instrument panel cluster (IPC) turns the antilock brake system (ABS) indicator ON during the IPC bulb check for approximately 3 seconds when the ignition switch is turned to the ON position. If the electronic brake control module (EBCM) sets a DTC, the EBCM sends the IPC the command to turn the ABS indicator ON.
Diagnostic Aids
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | Thoroughly inspect any circuitry that may be causing the complaint for the following conditions: |
| - | Backed out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal-to-wiring connections |
| - | Physical damage to the wiring harness |
| • | The following conditions may cause an intermittent malfunction: |
| - | A poor connection |
| - | Rubbed-through wire insulation |
| - | A broken wire inside the insulation |
| • | If an intermittent malfunction exists, refer to Inducing Intermittent Fault Conditions in Wiring Systems. |
Test Description
The numbers below refer to step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Instrument Panel, Gages, and Console Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Using a scan tool in the instrument panel cluster (IPC) Special Functions, attempt to turn OFF the ABS indicator. Did the ABS indicator turn OFF? | Go to Step 3 | Go to Step 4 | |
3 | Replace the electronic brake control module (EBCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the replacement complete? | Go to Step 5 | -- |
4 | Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the replacement complete? | Go to Step 5 | -- |
5 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
