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Home >> Cadillac >> 1998 >> Catera >> Repair and Diagnosis >> Brakes >> Anti-Lock Brake System With Traction Control System >> Diagnostic Tests >> DTC C0161: Abs/TCS Brake Switch Circuit Malfunction >> Notes

DTC C0161: Abs/TCS Brake Switch Circuit Malfunction: Notes

  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
  2. Observe rear brakelights. If brakelights are off, go to step 4)  . If brakelights are on, go to next step.
  3. Disconnect brakelight switch connector. If brakelights are on, go to step 18)  . If brakelights are off, go to step 12)  .
  4. Press brake pedal. If brakelights come on, go to next step. If brakelights remain off, go to step 8)  .
  5. Turn ignition off. Disconnect 31-pin EBTCM connector C1. Install Breakout Box (J-39700) and Adapter (J-39700-280) to EBTCM harness connector C1. Using DVOM, measure voltage at Breakout Box terminal No. 14 while an assistant presses brake pedal. If battery voltage is present, go to next step. If battery voltage is not present, go to step 7)  .
  6. Replace EBTCM.
  7. Repair open or high resistance in Black/White wire or Black/Yellow wire between brakelight switch and EBTCM.
  8. Check 20-amp HAZARD fuse No. 12 located in fuse block, behind left side of instrument panel. If fuse is okay, go to next step. If fuse is blown, go to step 13)  .
  9. Disconnect brakelight switch connector. Using DVOM, measure voltage at brakelight switch harness connector terminal No. 1 (Red wire). If battery voltage is present, go to step 11)  . If battery voltage is not present, go to next step.
  10. Repair open in Red wire between fuse block and brakelight switch.
  11. Connect a fused jumper wire between brakelight switch harness connector terminals. If brakelights come on, go to next step. If brakelights do not come on, go to step 7)  .
  12. Adjust or replace brakelight switch as necessary. See BRAKELIGHT SWITCH  under ADJUSTMENTS.
  13. Replace 20-amp HAZARD fuse No. 12. DO NOT press brake pedal. Check new 20-amp HAZARD fuse No. 12. If fuse is blown, go to next step. If fuse is okay, go to step 15)  .
  14. Repair short to ground in Red wire between fuse block and brakelight switch.
  15. Press brake pedal. Check new 20-amp HAZARD fuse No. 12. If fuse is okay, see INTERMITTENTS & POOR CONNECTIONS  under DIAGNOSIS & TESTING. If fuse is blown, go to next step.
  16. Turn ignition off. Disconnect 31-pin EBTCM connector C1. Replace 20-amp HAZARD fuse No. 12. Press brake pedal. Check new 20-amp HAZARD fuse No. 12. If fuse is okay, go to step 6)  . If fuse is blown, go to next step.
  17. Repair short to ground in Black/White wire or Black/Yellow wire between brakelight switch and EBTCM.
  18. Repair short to voltage in Black/White wire or Black/Yellow wire between brakelight switch and EBTCM.
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