Open Circuit In Motor Relay Circuit

DTC 52 OPEN CIRCUIT IN MOTOR RELAY CIRCUIT
DIAGNOSIS:
^ Faulty motor
^ Faulty motor relay
^ Faulty harness connector

TROUBLE SYMPTOM:
^ ABS does not operate.
^ EBD does not operate.

WIRING DIAGRAM:





CHECK INPUT VOLTAGE OF ABSCM&H/U.
Turn the ignition switch to OFF.
Disconnect the connector from ABSCM& H/U.
Turn the ignition switch to ON.
Measure the voltage between ABSCM&H/U connector and chassis ground.
Connector & terminal
(B301) No. 13 (+) - Chassis ground
Is the voltage 10 - 15 Volts?
Repair the harness/connector between battery and ABSCM&H/U and check fuse SBF8.

CHECK GROUND BOLTS.
Turn the ignition switch to OFF.
Are the ground bolts tightened 13 Nm (1.3 kgf-m, 9.6 ft. lbs.)?
Tighten the ground bolts securely.

CHECK GROUND CIRCUIT OF MOTOR.
Turn the ignition switch to OFF.
Measure the resistance between ABSCM&H/U connector and chassis ground.
Connector & terminal
(B301) No. 12 - Chassis ground:
Is the resistance less than 0.5 Ohms?
Repair the ABSCM&H/U ground harness.

CHECK MOTOR OPERATION.
Operate the sequence control.

Note: Use the diagnosis connector to operate sequence control.

Can motor revolution noise (buzz) be heard when carrying out the check sequence?
Replace the ABSCM&H/U.

CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
Is there poor contact in connector between generator, battery and ABSCM&H/U?
Repair the connector.

CHECK ABSCM&H/U.
Connect all connectors.
Erase the memory.
Perform the inspection mode.
Read out the DTC.
Is the same DTC as in current diagnosis still being output?
Replace the ABSCM&H/U.

CHECK ANY OTHER DTC APPEARANCE.
Are other DTCs being output?
Proceed with the diagnosis corresponding to DTC.
A temporary poor contact.