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.

Component Function Check

1. CHECK COMPRESSOR MOTOR RELAY OPERATION

CAUTION: The "COMPRESSOR" active test will remain ON until it is turned off using CONSULT-III. Allowing the compressor to run for an extended period of time may cause damage to the suspension control system components due to excessive air pressure.

CONSULT-III
1. Turn ignition ON.
2. Select "COMPRESSOR" of AIR LEVELIZER active test items.
3. While operating test item, check that the suspension air compressor turns ON.
ON: Compressor turns ON
OFF: Compressor turns OFF
Does the suspension air compressor operate properly?
YES >> Compressor motor relay and suspension air compressor are operating normally.
NO >> Refer to "Diagnosis Procedure".

Diagnosis Procedure

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.
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. Refer to SCS-17, "SUSPENSION AIR COMPRESSOR: Diagnosis Procedure". Suspension Air Compressor: Diagnosis Procedure
Does the power supply circuit test OK?
YES >> Replace the compressor motor relay.
NO >> Repair harness or connector.