The instrument cluster illuminates the traction control/stability control-active indicator, traction control off indicator and stability control off indicator for 5 s after ignition ON. The electronic brake control module (EBCM) will request the instrument cluster via serial data to turn the traction control/stability control-active indicator ON (flashing) when the system is in traction control or stability control mode. When the EBCM detects a fault it sends a serial data message to the instrument cluster commanding the traction control/stability control-active indicator ON.

The body control module (BCM) monitors the traction control switch. When the traction control switch is pressed once, the BCM will request the EBCM via serial data to disable the traction control. When the traction control switch is pressed for 5 s, the BCM will request the EBCM to disable the stability control. The EBCM will request the instrument cluster via serial data to turn the traction control off and stability control off indicator ON to notify the driver of the deactivation.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, with a scan tool command the instrument cluster All Indicators test ON and OFF. Verify the traction control/stability control-active indicator, traction control off indicator and stability control off indicator turn ON and OFF.

⇒	If either indicator does not turn ON and OFF, replace the P16 Instrument Panel Cluster (IPC).

2. Observe the scan tool EBCM Traction Control Switch parameter while pressing and releasing the traction control switch. Verify the reading changes between Active and Inactive.

⇒	If the parameter does not change between the specified values, refer to Circuit/System Testing.

3. Observe the scan tool EBCM Vehicle Stability Enhancement System Switch parameter while pressing the traction control switch for 5 s and releasing. Verify the reading changes between Active and Inactive.

⇒	If the parameter does not change between the specified values, replace the K9 Body Control Module (BCM).

4. Observe the traction control off indicator while pressing and releasing the traction control switch. Verify the traction control off indicator turns ON and OFF.

⇒	If the traction control off indicator does not turn ON and OFF, replace the K17 Electronic Brake Control Module (EBCM)

5. Observe the stability control off indicator while pressing the traction control switch for 5 s and releasing. Verify the stability control off indicator turns ON and OFF.

⇒	If the stability control off indicator does not turn ON and OFF, replace the K17 Electronic Brake Control Module (EBCM)

Note: Circuit/System Verification must be performed before Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the S48C Multifunction Switch - I/P.
2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

⇒	If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool EBCM Traction Control Switch parameter is Inactive.

⇒	If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module (BCM).

4. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground for 2 s.
5. Verify the scan tool EBCM Traction Control Switch parameter is Active.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module (BCM).

6. If all circuits test normal, test or replace the S48C Multifunction Switch - I/P.

Static Test

1. Ignition OFF, disconnect the harness connector at the S48C Multifunction Switch - I/P.
2. Test for infinite resistance between the signal circuit terminal 7 and the ground circuit terminal 2 with the switch in the released position.

⇒	If less than the specified value, replace the S48C Multifunction Switch - I/P.

3. Test for less than 5 Ω between the signal circuit terminal 7 and the ground circuit terminal 2 with the switch in the pressed position.

⇒	If greater than the specified value, replace the S48C Multifunction Switch - I/P.