Toyota Corolla Repair Manual: Inspection procedure

1 Check operation(stop lamp swtich assy)

1. Check that the stop light comes on when the brake pedal is depressed, and turns off when the brake pedal is released.

2 Input signal check

1. See input signal check on page 05–745.
2.  check the indicator light when the brake pedal is depressed.

   Ok: the indicator light goes off when the brake pedal is depressed.

3 Inspect terminal voltage(stp–)

1. Remove the cruise control ecu assy with connectors still connected.
2.  turn the ignition switch to on.
3.  measure voltage between terminal 3 (stp–) of cruise control ecu assy connector and body ground, when the brake pedal is depressed and released.

   Ok:

4 Check harness and connector(between cruise control ecu assy and stop lamp switch assy)

1. Check for open and short circuit in harness and connector between cruise control ecu assy and stop lamp switch assy

Check and replace cruise control ecu assy