Diagnosis Procedure

COMPRESSOR MOTOR RELAY


Description

Receives suspension air compressor ON signal from suspension control unit. When activated, the compressor motor relay supplies power to the suspension air compressor.





COMPRESSOR MOTOR RELAY


Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.
1.CHECK COMPRESSOR "ON" SIGNAL FROM SUSPENSION CONTROL UNIT
CONSULT-III





1. Turn ignition switch ON.
2. Disconnect compressor motor relay connector E130.
3. Select "COMPRESSOR" of AIR LEVELIZER active test items.
4. While operating test item, check voltage to compressor motor relay connector E130 terminal 2.






Is battery voltage present while operating test item?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK COMPRESSOR "ON" SIGNAL CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect suspension control unit connector B3.
3. Check continuity between suspension control unit connector B3
(A) terminal 1 and compressor motor relay connector E130 (B) terminal 2.






4. Check continuity between suspension control unit connector B3
(A) terminal 1 and ground.






Are the continuity test results as specified?
YES - Replace the suspension control unit. Removal and Replacement.
NO - Repair harness or connector.
3.CHECK COMPRESSOR MOTOR RELAY GROUND





1. Turn ignition switch OFF.
2. Check continuity between compressor motor relay connector
E130 terminal 1 and ground.






Is continuity present?
YES - GO TO 4.
NO - Repair harness or connector.
4.CHECK COMPRESSOR MOTOR RELAY POWER SUPPLY





1. Disconnect compressor motor relay connector E131.
2. Check voltage between compressor motor relay E131 terminal 5 and ground.






Is battery voltage present?
YES - GO TO 5.
NO - Inspect fuse and repair harness or connector.
5.CHECK COMPRESSOR MOTOR RELAY OUTPUT





1. Connect compressor motor relay connectors E130 and E131.
2. Disconnect suspension air compressor connector C9.
3. Turn ignition ON.
4. Select "COMPRESSOR" of AIR LEVELIZER active test items.
5. Check voltage between compressor motor relay C9 terminal 4 and ground.






Is battery voltage present?
YES - Compressor motor relay is functioning properly.
NO - GO TO 6.
6.CHECK AIR COMPRESSOR POWER SUPPLY CIRCUIT
Check the air compressor power supply circuit. Suspension Air Compressor.
Does the power supply circuit test OK?
YES - Replace the compressor motor relay.
NO - Repair harness or connector.