Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Corolla and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

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.
1. NO: INSPECT STOP LAMP CIRCUIT
2. YES: GO TO NEXT STEP.
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.
  
  Fig 1: Checking Input Signal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
2. NG: GO TO NEXT STEP.

INSPECT TERMINAL VOLTAGE (STP-)

Remove the cruise control ECU assy with connectors still connected.
Turn the ignition switch to ON.

Measure voltage between terminal 3 (STP-) of cruise control ECU assy connector and body ground, when the brake pedal is depressed and released.

OK:

VOLTAGE RESISTANCE SPECIFICATION

Brake Pedal	Voltage
Depressed	10 - 16 V
Released	Below 1 V

Fig 2: Identifying Terminal Voltage (STP-)

NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
OK: GO TO NEXT STEP.

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 (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )