Codes 37/38, TCC Brake Switch On/Off: Notes
WARNING: This page is about a different car, the 1995 GMC Sonoma and 1995 Chevrolet S10 Pickup. 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.