Inspection Procedure

1. Remove the BRK relay from the Relay Block No. 6.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   1 - 2	Below 1 Ω
   3 - 4	Below 1 Ω
   3 - 5	10 kΩ or higher

3. Apply battery voltage between terminals 1 and 2.
4. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   3 - 5	Below 1 Ω

   Fig 1: Identifying BRK Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BRK RELAY 

OK: Go to Next Step 

1. Disconnect the connector from the Relay Block No. 6.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   5 - Body ground	Ignition switch on	10 to 14 V
   5 - Body ground	Ignition switch off	Below 1 V
   1 - Body ground	Ignition switch on	10 to 14 V
   1 - Body ground	Ignition switch off	Below 1 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Disconnect the S3 connector from the skid control ECU.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   4 - S3-21 (STP2)	Always	Below 1 Ω
   4 - Body ground	Always	10 kΩ or higher
   3 - S3-27 (STP1)	Always	Below 1 Ω
   3 - Body ground	Always	10 kΩ or higher
   2 - S3-16 (STP0)	Always	Below 1 Ω
   2 - Body ground	Always	10 kΩ or higher

   Fig 2: Identifying S3 Skid Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE BRAKE ACTUATOR ASSEMBLY  (See REMOVAL )