Traction Control Indicator Always "ON" With No DTC Set

CIRCUIT DESCRIPTION
The TC indicator is controlled by the Electronic Brake and Traction Control Module (EBTCM). The EBTCM supplies the ground to the TC indicator circuit to turn the indicator on. When the TC indicator circuit is not grounded at the EBTCM, the TC indicator remains off. When the EBTCM sees the traction control switch voltage go low, it turns the TC indicator on and disables traction control. The EBTCM harness connector contains a shorting bar for the TC indicator circuit. When the EBTCM connector is disconnected from the EBTCM, the shorting bar shorts the TC indicator terminal to ground turning on the indicator.

DIAGNOSTIC AIDS
If the EBTCM harness connector is not securely connected to the EBTCM, the shorting bar in the harness connector may turn on the TC indicator. Make sure the EBTCM harness connector is securely connected to the EBTCM.
^ 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 "General Electrical Diagnostic Procedures" in Diagrams for further diagnosis.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
3. This step checks for an internal EBTCM malfunction. You must install the pinout box and cable adapter to the harness connector at this point to prevent the shorting bar in the harness connector from grounding the circuit and turning on the indicator.
5. This step checks for a short to ground in CKT XB105.