Inspection steps

WARNING: This page is about a different car, the 2014 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

Check brake switch.
1. Check the brake switch.
  Criteria: The switch and its installation position is correct.
  
  NG: Replace the switch main body or adjust its installation position.
  
  OK: Go to Next Step

Check brake switch circuit.

Turn the ignition switch to OFF.
Disconnect the parking brake switch connector.
Turn the ignition switch to ON.

Measure the voltage between connector terminal and chassis ground.

VOLTAGE

Inspection terminals	Inspection conditions	Standard value
A22-1 - chassis ground	Always	10V or more
A13-3 - chassis ground	Always	10V or more

NG: Check the fuse, and repair or replace the harness.

OK: Go to Next Step

Check brake switch circuit.

Turn the ignition switch to OFF.
Disconnect the ECM connector.
Turn the ignition switch to ON.

Measure the resistance between ECM connector and brake switch.

RESISTANCE (OPEN CIRCUIT CHECK)

Inspection terminals	Inspection conditions	Standard value
A33-7(BRK1)-A22-4	Always	Less than 10 Ω
A33-3 (BRK2) - A22-2	Always	Less than 10 Ω

NG: Repair or replace the harness.

OK: Replace the ECM.