DTC 37/38: TCC Brake Switch On/Off: Notes
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 1996 Chevrolet Chevy Van, 1995 GMC Yukon, 1995 GMC Vandura Special, 1995 GMC Vandura, and 1995 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.
The normally closed brake switch supplies battery voltage to control module. Signal voltage will drop to zero volts when brake pedal is applied.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks if voltage is available at brake switch.
- Checks brake switch function.
- Checks circuit from brake switch to control module.