Inspection Procedure

1. Check that the stop light comes on when the brake pedal is depressed and turns off when the brake pedal is released.

   OK 

   STOP LIGHT SWITCH SPECIFICATION
   
   

   Pedal Condition	Stop Light Condition
   Brake pedal depressed	Turns on
   Brake pedal released	Turns off

   HINT:

   Check the stop light bulb as it may have burnt out.

NG: Go to step  4

OK: Go to Next Step 

1. Measure the voltage of the connector.

   HINT:

   Measure the voltage from behind the connector with the connector connected to the skid control ECU.

   Standard voltage 

   STANDARD VOLTAGE CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   S8-14 (STP) - Body ground	Brake pedal depressed	8 to 14 V
   S8-14 (STP) - Body ground	Brake pedal released	Below 1 V

   Fig 1: Identifying Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step  7

OK: Go to Next Step 

1. Clear the DTCs (see DTC CHECK / CLEAR  ).
2. Turn the power switch ON (READY).
3. Check the same DTCs are recorded (see DTC CHECK / CLEAR  ).

   Result 

   DTC RESULT REFERENCE
   
   

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

B: REPLACE SKID CONTROL ECU 

A: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

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

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

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

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK: Go to Next Step 

Fig 2: Identifying Stop Light Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the stop light control relay (See INSPECTION ).

OK: The stop light control relay is normal. 

NG: REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY 

OK: Go to Next Step 

1. Disconnect the S16 switch connector.
2. Disconnect the S31 relay connector.
3. Measure the resistance of the wire harness side connectors.

Standard resistance 

1. Disconnect the S8 ECU connector.
2. Disconnect the S31 switch connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   S8-14(STP) - S31-8 (OUT)	Below 1Ω

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE SKID CONTROL ECU