Test J: The Traction Control/Roll Stability Control System Cannot Be Disabled

Pinpoint Test J: The Traction Control/Roll Stability Control System Cannot Be Disabled
Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation
When one or more drive wheels lose traction and begin to spin, the ABS module sends a request to the PCM over the high-speed controller area network (HS-CAN) bus to modulate the engine torque. This is achieved by regulating fuel and spark to the cylinders. At the same time, the ABS module operates the hydraulic pump motor and the appropriate hydraulic valves to actuate the brake calipers and sends a message to the instrument cluster along the HS-CAN bus to flash the stability/traction control indicator. The system can be disabled pressing the stability/traction control switch. When the switch is pressed, the ABS receives a voltage signal and will ignore any stability/traction control events until the switch is pressed again or the ignition switch is cycled.

Fused ignition voltage is sent to the stability/traction control switch from smart junction box (SJB) fuse 18 (10A) along circuit CBP18 (GY/OG). When pressed, the switch closes and momentarily connects circuit CBP18 (GY/OG) to circuit CCA15 (YE/GY) sending the voltage to the ABS module along circuit CCA15 (YE/GY). The ABS module sends a message to the instrument cluster along the HS-CAN bus to illuminate the stability/traction control indicator.

This pinpoint test is intended to diagnose the following:
^ Wiring, terminals or connectors
^ Stability traction control switch
^ ABS module

J1:

J1 (Continued)-J4:

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