Traction Off Indicator Always On
Traction Off Indicator Always On
Circuit Description
The traction control system (TCS) TRAC OFF indicator is controlled by the instrument panel cluster (IPC) via class 2 serial data messages from the electronic brake control module (EBCM). When the EBCM sees the TCS switch fault, the EBCM then disables the TCS and sends a message to the IPC to turn the TRAC OFF indicator ON. Each time the ignition is cycled from OFF to ON, the TCS is enabled.
The following conditions will cause the TRAC OFF indicator to illuminate:
* The EBCM has disabled the TCS due to a DTC.
* The EBCM has disabled the TCS due to a overheated ABS/TCS hydraulic unit.
* The IPC bulb check. When the ignition switch is turned to ON, the TRAC OFF indicator will turn ON for approximately 5 seconds and then turn OFF.
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. Component Tests and General Diagnostics
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Checks if the scan tool can turn ON and OFF all the indicator lamps in the IPC.
4. Checks if the circuits going to the IPC or the IPC is at fault.
