Inspection Procedure

Hand-held tester: 

1. CHECK OPERATION OF STOP LIGHT
   1. Check if the stop lights go on and off normally when the brake pedal is depressed and released.
   • NG: REPAIR OR REPLACE STOP LIGHT SWITCH ASSY 
   • OK 
2. INSPECT STOP LIGHT SWITCH ASSY 
   1. Check the resistance between the terminals when the switch is turned ON and OFF. 
      Fig 1: Inspecting Stop Light Switch Assembly

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Fig 2: Stop Light Switch Assembly Condition Chart

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   • NG: REPLACE STOP LIGHT SWITCH ASSY 
   • OK 
3. READ VALUE OF HAND-HELD TESTER (STP SIGNAL) 
   1. Turn the ignition switch ON.
   2. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STOP LIGHT SW" and read its value displayed on the hand-held tester.
      Fig 3: Identifying Depressed/Released Brake Pedal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Fig 4: Identifying Specified Condition

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • OK: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
   • NG 
4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the S9 stop light switch connector.
   2. Disconnect the E5 ECM connector.
   3. Check the resistance between the wire harness side connectors.
      Fig 5: Identifying Stop Light Switch Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for open): 

      Fig 6: Checking Conditions (Open)

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      Standard (Check for short): 

      Fig 7: Checking Conditions (Short)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the ECM connector.
   5. Reconnect the stop light switch connector.
   Fig 8: Identifying ECM Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   • OK 

   REPLACE ECM (See  REPLACEMENT  ) 

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

1. CHECK OPERATION OF STOP LIGHT 
   1. Check if the stop lights go on and off normally when the brake pedal is depressed and released.
   • NG: REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT 
   • OK 
2. INSPECT STOP LIGHT SWITCH ASSY 
   1. Check the resistance between terminals when the switch ON and OFF.
      Fig 9: Inspecting Stop Light Switch Assembly

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Fig 10: Checking Resistance

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: REPLACE STOP LIGHT SWITCH ASSY 
   • OK 
3. INSPECT ECM (STP VOLTAGE) 
   1. Turn the ignition switch ON.
   2. Measure the voltage between the terminals of the E4 and E5 ECM connectors.
      Fig 11: Inspecting ECM (STP Voltage)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      Fig 12: Measuring Voltage

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • OK: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
   • NG 
4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
   1. Disconnect the S9 stop light switch connector.
   2. Disconnect the E5 ECM connector.
   3. Check the resistance between the wire harness side connectors.
      Fig 13: Identifying Stop Light Switch Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for open): 

      Fig 14: Checking Resistance (Open)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      Fig 15: Checking Resistance (Short)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the ECM connector.
   5. Reconnect the stop light switch connector.
   Fig 16: Identifying ECM Connector
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
   • OK 

   REPLACE ECM (See  REPLACEMENT  )