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

1. Check if the stop lamps go on and off normally when the brake pedal is depressed and released.

NG: REPAIR OR REPLACE STOP LAMP SWITCH CIRCUIT 

OK: GO TO NEXT STEP. 

1. Check for continuity between each pair of the terminals.

   Standard: 

   Fig 1: Stop Lamp Switch Terminals Specified Condition Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 2: Identifying Stop Lamp Switch Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LAMP SWITCH ASSY 

OK: GO TO NEXT STEP. 

1. Turn the ignition switch to ON.
2. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors.

   Standard: 

   Fig 3: ECM Terminals Specified Condition Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 4: Depressing And Releasing Brake Pedal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 

NG: GO TO NEXT STEP. 

1. Disconnect the S13 stop lamp switch connector.
2. Disconnect the E7 ECM connector.
3. Check the resistance between the wire harness side connectors.

   Standard (Check for open): 

   Fig 5: Stop Lamp Switch And ECM Connector Terminals Specified Condition Chart (Check For Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard (Check for short): 

   Fig 6: Stop Lamp Switch And ECM Connector Terminals Specified Condition Chart (Check For Short)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Reconnect the stop lamp switch connector.
5. Reconnect the ECM connector.
   Fig 7: Identifying Stop Lamp Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 8: Connecting E7 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

REPLACE ECM (See  ECM (3MZ-FE)  )