W/Harness Inspection

Electronic Control Suspension
C2108 Compressor Relay - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Power Circuit Inspection

Check for open or short
1. IG "OFF"
2. Disconnect compressor relay.
3. IG "ON"
4. Measure voltage between power terminal of the compressor relay harness connector and chassis ground.

Specification : Battery voltage




5. Is the measured value within specification?






Control Circuit Inspection

Check for open in harness
1. IG "OFF"
2. Disconnect compressor relay and ECS ECU connector.
3. Measure resistance between control terminal of the compressor relay harness connector and control terminal of the ECS ECU harness connector.

Specification : Below approx. 1 Ohms




4. Is the measured value within specification?





Check for short in harness
1. IG "OFF"
2. Disconnect compressor relay and ECS ECU connector.
3. Measure resistance between control terminal of the compressor relay harness connector and chassis ground.

Specification : Infinite




4. Is the measured value within specification?