Inspection Procedure

1. Check the Data List for proper functioning of the stop light switch.

   ABS/VSC/TRAC: 

   MEASUREMENT ITEM/RANGE AND DIAGNOSTIC NOTE
   
   

   Tester Display	Measurement Item/Range	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.
Fig 1: Identifying A19 ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION AND 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

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.
   Fig 2: Identifying Stop Light Control Relay (Marking BRK)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the relay.
   TESTER CONNECTION AND 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.
   Fig 3: Identifying Stop Light Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the switch.

   Standard resistance 

   TESTER CONNECTION AND 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

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK: Go to next step. 

1. Disconnect the A19 ECU connector.
Fig 4: Identifying A19 ECU And A3 Switch Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A3 switch connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION
   
   

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

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 

   DTC RESULT DESCRIPTION
   
   

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

B: END 

A: REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY