Inspection Procedure

1. Use the Data List to check if the stop light switch is functioning properly.

   Main Body 

   TESTER DISPLAY REFERENCE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

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

NG: REPLACE MAIN BODY ECU 

OK: Go to Next Step 

1. Remove the STOP fuse from the main body ECU.
2. Measure the resistance of the fuse.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   STOP fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: Go to Next Step 

1. Remove the stop light switch (see REMOVAL ).
Fig 1: Inspecting Stop Light Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   1-2	Stop light switch pin not pushed	Below 1 Ω
   3-4	Stop light switch pin not pushed	10 kΩ or higher
   1-2	Stop light switch pin pushed	10 kΩ or higher
   3-4	Stop light switch pin pushed	Below 1 Ω

NG: REPLACE STOP LIGHT SWITCH  (See REMOVAL )

OK: Go to Next Step 

Fig 2: Identifying A35 Stop Light Switch And DH Main Body ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A35 stop light switch connector.
2. Disconnect the DH main body ECU connector.
3. Measure the voltage and resistance according to the value (s) in the table below.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A35-2 - Body ground	Always	11 to 14 V

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A35-1-DH-15 (STP)	Always	Below 1 Ω
   A35-1 or DH-15 (STP) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Use the Data List to check if the stop light switch is functioning properly.

   Body No.4 

   TESTER DISPLAY REFERENCE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light Tr.	Stop light switch/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

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

NG: REPLACE MAIN BODY ECU 

OK: GO TO LIGHTING SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )