Inspection Procedure

1. Remove the BRK relay from the R/B No. 6.
2. Check the continuity between each terminal BRK relay.

   Resistance 

   BRK RELAY (1 OF 2)
   
   

   Terminal No.	Specified Condition
   1 - 2	Below 1 Ω
   3 - 4	Below 1 Ω
   3 - 5	10 kΩ or higher

3. Apply battery voltage between terminal 1 and 2.
4. Check the continuity between each terminal of BRK relay.

   Resistance 

   BRK RELAY (2 OF 2)
   
   

   Terminal No.	Specified Condition
   3 - 5	Below 1 Ω

   Fig 1: Checking BRK Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE BRK RELAY 

OK: GO TO NEXT STEP 

1. Check for an open or short circuit in harness and connector between the BRK relay and battery (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO NEXT STEP 

1. Check for an open or short circuit in harness and connector between the BRK relay and skid control ECU (See HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS ).

   HINT:

   When a malfunction is found in the skid control ECU, replace the brake actuator assembly.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE BRAKE ACTUATOR ASSEMBLY