W/Harness Inspection

Terminal and Connector inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. 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 Short to Ground in Power Circuit
1. IG KEY 'OFF'.
2. Disassemble A/C Relay.
3. Measure resistance between power terminal of A/C Relay harness side and chassis ground.

Specification : Infinite Ohms





4. Is resistance within specification?





Check for Open in Power Circuit
1. IG KEY 'OFF'.
2. Disassemble A/C Relay.
3. IG KEY 'ON'.
4. Measure voltage between power terminal of A/C Relay harness side and chassis ground.

Specification : Approx. 12V





5. Is voltage within specification?






Control Circuit Inspection

Check for Short to Ground in Control Circuit
1. IG KEY 'OFF'.
2. Disassemble A/C Relay.
3. Measure resistance between control terminal of A/C Relay harness side and chassis ground.

Specification : Infinite Ohms





4. Is resistance within specification?





Check for Open in Control Circuit
1. IG KEY 'OFF'.
2. Disassemble A/C Relay.
3. IG KEY 'ON'.
4. Measure voltage between control terminal of A/C Relay harness side and chassis ground.

Specification : Approx. 4.5V





5. Is voltage within specification?