Inspection Procedure

1. Check the DATA LIST for proper functioning of the stop light switch.

   Skid control ECU 

   ITEM REFERENCE
   
   

   Item (Display)	Measurement Item / Range (Display)	Normal Conditions	Diagnostic Note
   STOP LAMP SW	Stop light switch / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   OK: ON (brake pedal is depressed) appears on the screen. 

NG: Go to step   3 

OK: GO TO NEXT STEP. 

1. Disconnect the A19 ECU connector. (See Fig 1).
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A19-21 (STP2) - Body ground	Brake pedal depressed	8 to 14 V
   A19-21 (STP2) - Body ground	Brake pedal released	Below 4.0 V

   Fig 1: Identifying A19 ECU Harness Connector Terminals (STP2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step   6 

OK: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY 

1. Remove the STOP fuse and ECU-IG1 fuse from the instrument panel junction block.
2. Measure the resistance of the fuse.

   Standard resistance: 

   Below 1 Ω 

NG: REPLACE FUSE 

OK: GO TO NEXT STEP. 

1. Remove the stop light control relay from the engine room No. 1 relay block.
2. Measure the resistance of the relay.
   Fig 2: Identifying Relay Test Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   3 - 4	Below 1 Ω
   3 - 5	10 kΩ or higher
   3 - 4	10 kΩ or higher (when battery voltage is applied to terminals 1 and 2)
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG: REPLACE STOP LIGHT CONTROL RELAY 

OK: GO TO NEXT STEP. 

1. Disconnect the stop light switch connector.
2. Measure the resistance of the switch.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Pin not pushed	Below 1 Ω
   1 - 2	Pin pushed	10 kΩ or higher
   3 - 4	Pin not pushed	10 kΩ or higher
   3 - 4	Pin pushed	Below 1 Ω

   Fig 3: Identifying Stop Light Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK: GO TO NEXT STEP. 

1. Disconnect the A19 ECU connector. (See Fig 4).
2. Disconnect the A3 switch connector. (See Fig 4).
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A19-21 (STP2) - A3-1	Below 1 Ω

   Fig 4: Identifying A3 Switch Assembly & A19 Harness Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: GO TO NEXT STEP. 

1. Clear the DTC (see DTC CHECK / CLEAR ).
2. Check if the same DTC is output (see DTC CHECK / CLEAR ).

   Result 

   RESULT PROCEED
   
   

   Result	Proceed to
   DTC is output	A
   DTC is not output	B

B: END 

A: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY