Inspection Procedure

1. Disconnect A43 and A44 actuator connectors.
2. Connect the battery positive (+) lead to terminal 2 (BM1) or 3 (BM2) and battery negative (-) lead to terminal 1 (GND1) or 6 (GND2) of the brake actuator (pump motor).

   OK: Operation sound of pump motor should be heard. 

OK: Go to step  4

Fig 1: Identifying A43 And A44 Actuator Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to Next step 

1. Disconnect A43 and A44 actuator connectors.
2. Measure the resistance between terminals MT+ and MT-, BM1 and MTT, BM2 and MTT, GND1 and MT+, GND2 and MT+ of the actuator.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A44-5 (MT+) - A44-8 (MT-)	30 to 36 Ω
   A43-2 (BM1) - A44-7 (MTT)	30 to 36 Ω
   A44-3 (BM2) - A44-7 (MTT)	30 to 36 Ω
   A43-1 (GND1) - A44-5 (MT+)	30 to 36 Ω
   A44-6 (GND2) - A44-5 (MT+)	30 to 36 Ω

NG: REPLACE BRAKE ACTUATOR 

Fig 2: Identifying A43 And A44 Actuator Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next step 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE SKID CONTROL ECU ASSEMBLY 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to Next step 

1. Check the brake actuator pump motor (see DISASSEMBLY ).

NG: REPLACE BRAKE ACTUATOR PUMP MOTOR 

OK: REPLACE BRAKE ACTUATOR