Toyota Sienna Service Manual: Open in ABS Motor Relay Circuit

Toyota Sienna Service Manual / Brake control / Anti-lock brake system / Diagnostic trouble code chart / Open in ABS Motor Relay Circuit

Open in ABS Motor Relay Circuit

DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay on and operates the ABS pump motor.

If the voltage supplied to the motor relay (+BM) is below the DTCs detection threshold due to low voltage from the battery/alternator, the DTCs may be stored.

Open in ABS Motor Relay Circuit

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT: After steps 1, 2 and 3 are completed, start the inspection from step 4 when using the intelligent tester, and from step 5 when not using the intelligent tester.

1 INSPECT FUSE (ABS 1 FUSE)

(a) Remove the ABS 1 fuse from the FL block.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

2 INSPECT SKID CONTROL ECU (+BM TERMINAL VOLTAGE)

INSPECT SKID CONTROL ECU (+BM TERMINAL VOLTAGE)

(a) Install the ABS 1 fuse.

(b) Disconnect the skid control ECU connector.

Standard voltage

3 INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

(a) Measure the resistance according to the value(s) in the table below.

Standard resistance

4 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)

(a) Reconnect the skid control ECU connector.

(b) Connect the intelligent tester to the DLC3.

(d) Start the engine.

(e) Select the ACTIVE TEST mode on the intelligent tester.

ABS:

(f) Check operating sound of the ABS motor when operating it with the intelligent tester.

OK: The operating sound of the ABS motor is heard.

5 RECONFIRM DTC

(a) Clear the DTCs (See page BC-10).

(b) Start the engine.

(d) Check that the same DTCs are recorded (See page BC- 10).

HINT:

Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.
If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU, with the ignition switch on and the stop light switch off, the ECU performs selfdiagnosis of the motor and solenoid circuits.

Result

HINT:

If any DTCs are output while jiggling a connector or wire harness of the brake actuator (skid control ECU), inspect and repair the connector or wire harness.
If the normal system code is output, slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
These DTCs may be stored due to a malfunction in the connector terminal connection, etc.

REPLACE BRAKE ACTUATOR ASSEMBLY

SFR Solenoid Circuit

DESCRIPTION The solenoid comes on when signals are received from the ECU and controls the pressure acting on the wheel cylinders, thus controlling brake force. WIRING DIAGRAM INSPECT ...

Open in ABS Solenoid Relay Circuit

DESCRIPTION This relay supplies power to each ABS solenoid. Immediately after the ignition switch is turned to the ON position, the relay turns on if the solenoid is determined to be normal ...

Other materials:

Removal
1. REMOVE FRONT DOOR OPENING TRIM WEATHERSTRIP LH 2. REMOVE FRONT DOOR OPENING TRIM WEATHERSTRIP RH 3. REMOVE FRONT PILLAR GARNISH LH 4. REMOVE FRONT PILLAR GARNISH RH 5. REMOVE VISOR ASSEMBLY LH 6. REMOVE VISOR ASSEMBLY RH 7. REMOVE ASSIST GRIP SUB-ASSEMBLY (2) 8. REMOVE VISOR HOLDER (1) ...

ACC Power Source Circuit
DESCRIPTION This circuit supplies power to the A/C amplifier and the illumination for the clock. WIRING DIAGRAM INSPECTION PROCEDURE 1 INSPECT FUSE (ECU ACC) (a) Remove the ECU ACC fuse from the engine room relay block. (b) Measure the resistance according to the value(s) in the tab ...

Disassembly
1. Remove repair service starter kit (a) Remove the nut and disconnect the lead wire from the repair service starter kit. (b) Remove the 2 screws which are used to secure the repair service starter kit to the repair service starter kit. (c) Remove the repair service starter kit. ( ...