W/Harness Inspection

Terminal and Connector inspection

1. Many malfunctions in the electrical system are caused by poor harness 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 voltage
1. IG "OFF" and disconnect ECM connector.
2. IG "ON" and keep the brake taking off. (Measurement "A").
3. Measure the voltage between brake switch signal terminal of ECM harness connector and chassis ground.
4. Measure the voltage between brake lamp signal terminal of ECM harness connector and chassis ground.
5. Keep the brake stepping on. (Measurement "B")
6. Measure the voltage between brake switch signal terminal of ECM harness connector and chassis ground.
7. Measure the voltage between brake lamp signal terminal of ECM harness connector and chassis ground.

Specification : B+













8. Is the measured voltage within specification?





Check open in harness
1. IG "OFF" and disconnect stop lamp switch and ECM connector.
2. Measure the resistance between brake switch signal terminal of ECM harness connector and brake switch signal terminal of Stop lamp switch harness connector.
3. Measure the resistance between brake lamp signal terminal of ECM harness connector and brake lamp signal terminal of Stop lamp switch harness connector.

Specification : Below 1 Ohm





4. Is the measured resistance within specification?





Check battery voltage
1. IG "OFF" and disconnect stop lamp switch connector.
2. Measure the voltage between power supply terminals of stop lamp switch harness connector and chassis ground.
3. IG "ON"
4. Measure the voltage between power supply terminals of stop lamp switch harness connector and chassis ground.
Specification :









5. Is the measured voltage within specification?