Code 38, TCC Brake Switch Error: Notes
WARNING: This page is about a different car, the 1994 Cadillac Fleetwood. However, it is still accessible from the selected car via links, so may be relevant.
PCM monitors activity of the normally-closed brake switch. Switch opens when brake pedal is applied.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks for voltage at brake switch.
- Simulates brake switch closed or brakes off. Checks TCC brake switch circuit between PCM and switch.
- Checks circuit between TCC brake switch and PCM. Test opens TCC brake switch, simulating brakes applied.