DTC 41, Brake Switch Circuit Fault: Notes
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1995 GMC Yukon, 1995 GMC Suburban, 1995 GMC Pickup, 1995 GMC Cab & Chassis, and 1995 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
TCC normally closed brake switch supplies a battery voltage signal on TCC brake switch signal circuit to PCM. Circuit is open when brakes are applied. Brake light/cruise control normally open brake switch supplies a battery voltage signal on cruise control/brake switch signal circuit to PCM when brakes are applied. DTC 41 will set when:
- Switches disagree for 10 consecutive minutes.
Or
- TCC and cruise control brake switches are not toggling open and closed during 6 brake applications on same ignition cycle.
PCM will default to an incorrect brake signal can affect TCC, 4th gear operation, in hot mode and cruise control.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This step checks for voltage at brake switch.
- This step simulates brake switch closed or brakes off.
- This step checks for ignition feed to TCC brake switch.
- This step checks TCC brake switch signal circuit and simulates brakes being applied.