For 1990-2009 cars

### Circuit Description

The brake switch is normally closed supplying 12 volts to the powertrain control module (PCM) at terminal J1C14 when the ignition is ON and the brake is OFF.

### Conditions for Setting the DTC

DTC P0573 will set if voltage at circuit 86B is always 12 volts when the vehicle has cycled 2 times from 0-55 km/h (0-34 mph).

### Test Description

Numbered steps below refer to steps on the trouble chart.

1. When disconnecting the brake switch connector, the PCM should see 0 volts at terminal J1C14. Zero volts should be indicated as a brake switch ON.
2. If the scan tool indication is OFF when the brake switch was disconnected, it indicates a short to voltage on circuit 86B to the PCM.

### Diagnostic Aids

This code could set by a customer who comes to a complete stop without using the foot brake.

A blown 5 amp cruise fuse will cause a DTC P0573 to set.