Inspection Procedure

1. Remove the BRK relay from the engine room R/B No.1.
2. Check operation of the BRK relay.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Terminal No.	Condition	Specified Condition
   3 - 5	Always	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminal 1 and 2.	Below 1 Ω

Fig 1: Checking BRK Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BRK RELAY 

OK: Go to Next Step 

1. Disconnect the connector from the engine room R/B No. 1.
2. Measure the voltage according to the value (s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Terminal No.	Condition	Specified Condition
   5 - Body ground	Ignition switch on (IG)	10 to 14 V
   5 - Body ground	Ignition switch off	Below 1 V
   2 - Body ground	Ignition switch on (IG)	10 to 14 V
   2 - Body ground	Ignition switch off	Below 1 V

Fig 2: Identifying BRK Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FAILURE RELAY (BRK RELAY) 

OK: Go to Next Step 

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

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Terminal No.	Condition	Specified Condition
   1 - A34-16 (STP0)	Always	Below 1 Ω
   A34-16 (STP0) - Body ground	Always	10 kΩ or higher
   4 - A34-21 (STP2)	Always	Below 1 Ω
   A34-21 (STP2) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying BRK Relay And Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE SKID CONTROL ECU