Inspection Procedure

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

   OK 

   PEDAL CONDITION ILLUMINATION CHART
   
   

   Pedal Condition	Illumination Condition
   Brake pedal depressed	ON
   Brake pedal released	OFF

   HINT:

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

NG:  Go to step  4

OK: Go to Next Step 

1. Disconnect the skid control ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   S3-27(STP1)-Body ground	Brake pedal depressed	8 to 14 V
   S3-27(STP1)-Body ground	Brake pedal released	Below 1 V

Fig 1: Identifying Skid Control ECU Connector S3 Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG:  Go to step  5

OK: Go to Next Step 

1. Clear the DTCs (See DTC CHECK / CLEAR  ).
2. Turn the ignition switch to the ON position.
3. Are the same DTCs detected?

   Result 

   RESULT CHART
   
   

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

   NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION  ).

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

A: REPLACE BRAKE ACTUATOR ASSEMBLY 

1. Disconnect the stop light switch assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester connection	Switch condition	Specified condition
   1-2	Switch pin free	Below 1 Ω
   1-2	Switch pin pushed in	10 kΩ or higher

Fig 2: Identifying Stop Light Switch Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH 

OK: Go to Next Step 

1. Disconnect the stop light switch connector and skid control ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   S3-27 (STP1) - S12-1 (STP)	Below 1 Ω

   NOTE: When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION  ).
Fig 3: Identifying Skid Control ECU Connector S3 Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE BRAKE ACTUATOR ASSEMBLY