Inspection Procedure

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

   Standard resistance 

   TERMINAL SPECIFIED VALUE CHART
   
   

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

   Fig 1: BRK Relay Circuit Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE BRK RELAY 

   OK: Go to next step. 

2. CHECK WIRE HARNESS AND CONNECTOR (BRK RELAY - BATTERY) 
   1. Disconnect the connector from the engine room R/B.
   2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TERMINAL SPECIFICATIONS
   
   

   Terminal No.	Condition	Specification
   5 - Body ground	Always	10 to 14 V
   2 - Body ground	Ignition switch on	10 to 14 V
   2 - Body ground	Ignition switch off	Below 1 V

   Fig 2: Identifying BRK Relay

   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. 

3. CHECK WIRE HARNESS AND CONNECTOR (BRK RELAY - SKID CONTROL ECU) 
   1. Disconnect the connectors from the skid control ECU.
   2. Measure the resistance according to the value(s) in the table below.

Standard resistance 

Fig 3: Checking Wire Harness And Connector (BRK Relay - Skid Control ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE SKID CONTROL ECU