Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPERATION BRAKE ACTUATOR PUMP MOTOR
1. Disconnect A37 and A38 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 Operation Brake Actuator Pump Motor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO Next Step

CHECK BRAKE ACTUATOR RESISTANCE

Disconnect A37 and A38 actuator connectors.
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

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
A38-S (MT+) - A38-8 (MT-)	30 to 36 Ω
A37-2 (BM1) - A38-7 (MTT)	30 to 36 Ω
A38-3 (BM2) - A38-7 (MTT)	30 to 36 Ω
A37-1 (GND1) - A38-5 (MT+)	30 to 36 Ω
A38-6 (GND2) - A38-5 (MT+)	30 to 36 Ω

NG: REPLACE BRAKE ACTUATOR

Fig 2: Identifying A37 & A38 Actuator Connectors Terminals

OK: GO TO Next Step

CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR (MT+, MT-))
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE SKID CONTROL ECU ASSEMBLY
CHECK WIRE HARNESS (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR)
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: GO TO Next Step
CHECK BRAKE ACTUATOR PUMP MOTOR
1. Check the brake actuator pump motor (see REMOVAL )
NG: REPLACE BRAKE ACTUATOR PUMP MOTOR

OK: REPLACE BRAKE ACTUATOR