Circuit Description
The instrument panel cluster (IPC) turns the LOW TRAC 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 diagnostic trouble code (DTC), the EBCM sends the IPC the command to turn the LOW TRAC 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 for further diagnosis. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views or Displays and Gages Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
All indicators will turn ON when commanded on. Does the LOW TRAC Indicator turn on, then off? | Go to Step 3 | Go to Step 4 | |
3 | Replace the electronic brake control module (EBCM). Refer to Control Module References for replacement, setup, and programming. Is the replacement complete? | -- | |
Is the instrument cluster replacement complete? | -- | ||
