OBD II scan tool (excluding hand-held tester):

WARNING: This page is about a different variant/trim than selected.

CHECK STOP LAMP (OPERATION)
1. Check if the stop lamps turn on and off normally when the brake pedal is depressed and released.
  OK:
  
  The stop lamps turn on when you depress the brake pedal.
1. NG: REPAIR OR REPLACE STOP LAMP SWITCH CIRCUIT
2. OK: GO TO NEXT STEP.

INSPECT STOP LAMP SWITCH ASSY

Measure the resistance of the switch terminals.

Fig 1: Identifying Stop Lamp Switch Assembly Connector Terminals

G02907944

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

TESTER CONNECTION AND CONDITION SPECIFICATIONS

Switch Condition	Tester Connection	Specified Condition
Switch pin free	1 - 2	Below 1 Ω
Switch pin free	3 - 4	10 kΩ or higher
Switch pin pushed in	1 - 2	10 kΩ or higher
Switch pin pushed in	3 - 4	Below 1 Ω

NG: REPLACE STOP LAMP SWITCH ASSY
OK: GO TO NEXT STEP.

INSPECT ECM (STP, ST1 VOLTAGE)

Turn the ignition switch ON.

Measure the voltage of the ECM connectors.

Fig 2: Identifying E9 & E6 ECM Connector Terminals

G02907945

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

TESTER CONNECTION AND CONDITION SPECIFICATIONS

Tester Connection	Brake Pedal Condition	Specified Condition
E6-19 (STP) - E9-1 (E1)	Depressed	7.5 to 14 V
E6-19 (STP) - E9-1 (E1)	Released	Below 1.5 V
E6-12 (ST1) - E9-1 (E1)	Depressed	Below 1.5 V
E6-12 (ST1) - E9-1 (E1)	Released	7.5 to 14 V

OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )
NG: GO TO NEXT STEP.

CHECK WIRE HARNESS (STOP LAMP SWITCH - ECM)
1. Disconnect the S15 stop lamp switch connector.
2. Disconnect the E6 ECM connector.
3. Measure the resistance of the wire harness side connectors.
  
  Fig 3: Identifying Wire Harness (Stop Lamp Switch) & ECM Connector Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 4: Harness Resistance Specifications
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. OK: REPLACE ECM (See REPLACEMENT )