Test A: Traction Control Switch Indicator Led Inoperative

Install scan tool. Turn ignition on, with engine off. Using scan tool, check for DTCs. If DTCs are present, diagnose affected DTC(s). If no DTCs are present, go to next step.
NOTE: If LED is on at all times, and no DTC(s) are present, check for short to voltage in circuit No. 832 (Light Blue wire) between Electronic Brake and Traction Control Module (EBTCM) and Body Control Module (BCM). See WIRING DIAGRAMS .
Using scan tool, select Body Menu. Command LED on. If LED follows command, go to next step. If LED does not follow command, check for terminal tightness at switch and Body Control Module (BCM) harness connector. Repair as necessary. If terminals are okay, replace BCM.
Select Chassis Menu. Monitor traction control switch status. Depress traction control switch. If scan tool displays ON, go to next step. If scan tool does not display ON, go to step 5.
Disconnect circuit No. 832 (Light Blue wire) from BCM harness connector J2 terminal A7. Connect a DVOM between ground and circuit No. 832. If DVOM reading toggles when switch is depressed, check for terminal tightness at BCM harness connector. Repair as necessary. If terminal is okay, replace BCM. If DVOM reading does not toggle when switch is depressed, check for open in circuit. Repair as necessary. If circuit is okay, replace EBTCM.
Verify TCS operation. If TCS operates normally, repair circuit No. 832 (Light Blue wire) for short to ground. If TCS does not operate normally, check for short in circuit No. 1788 (Light Blue wire) between traction control switch and EBTCM. Repair as necessary. If circuit is okay, check for terminal tightness. Repair as necessary. If terminals are okay, replace EBTCM.