Low Traction Indicator Inoperative

Antilock Brake System

Diagnostic Information and Procedures

Low Traction Indicator Inoperative

Circuit Description

The ignition 1 voltage circuit supplies 12 volts to the traction control switch. The EBCM illuminates the low traction indicator by applying ground to the traction control active signal circuit.

Diagnostic Aids

The traction control system can be controlled by the operator in the following ways:
Through operation of the traction control switch.
Through programming of the traction control system automatic engagement feature.
Depending on the programmed state, the operation of the traction control system, as well as the operation of the traction off and low traction indicators, differs. For a more detailed explanation of these operational characteristics, refer to Traction Control Indicator Lamps in ABS Description and Operation (Over 8600 GVW) or ABS Description and Operation (8600 GVW or less).
Observe the data list parameters listed below in order to determine the status of the traction control system when it is unknown if the system is operational.
Traction Control Enabled
Traction Off Lamp Command
Press the traction control switch and observe the scan tool in order to verify a change in the status of the data list parameters.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent and Poor Connections, Wiring Repairs and Connector Repairs in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3. This step verifies the ignition 1 voltage circuit can supply adequate power to the traction control switch.
4. This step verities the EBCM is applying ground to the low traction indicator.
5. The EBCM may be damaged if the traction control active signal circuit is shorted to voltage

Low Traction Indicator Inoperative Steps 1 - 3:

Low Traction Indicator Inoperative (cont'd) Steps 4 - 11: