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Home >> GMC >> 2000 >> Yukon Base, 5.3 T, 4WD >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Symptom Tests >> Test E: Traction Off Indicator Always On

Test E: Traction Off Indicator Always On

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. Using scan tool, command TRACTION OFF indicator light off. If indicator light turns off when commanded off, problem is intermittent. If indicator light does not turn off when commanded off, go to next step.
  3. Turn ignition off. Remove traction assist switch. Connect a test light between the service traction control signal circuit and ignition 1 voltage circuit at the traction assist switch harness connector. Turn ignition on. Using scan tool, command TRACTION OFF indicator light on and off. If test light turns on and off with each command, go to step  5. If test light does not turn on and off with each command, go to next step.
  4. Check service traction control signal circuit for short to ground. Repair as necessary. After repairs, go to step  9. If circuit is okay, go to step  6.
  5. Check for poor connections at traction assist switch. Repair as necessary. After repairs, go to step  9. If connections are okay, go to step  7.
  6. Check for poor connections at EBCM harness connector. Repair as necessary. After repairs, go to step  9. If connections are okay, go to step  8.
  7. Replace traction assist switch. After replacing switch, go to step  9.
  8. Replace EBCM. After replacing EBCM, go to next step.
  9. Using scan tool, command TRACTION OFF indicator light on and off. If indicator light turns on and off with each command, system is okay. If indicator light does not turn on and off with each command, go to step  3.
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