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 ?






Signal Circuit Inspection

Check CAN high communication circuit
1. Ignition "ON" and Engine "OFF".
2. Connect scantool and select VEHICLE SCOPE METER function.
3. Measure waveform between terminal "B13" of BCM ECU and chassis ground.

Specification : CAN communication waveform is displayed





4. Is the measured waveform within specifications ?
** The existance of CAN communication waveform itself shows there's no trouble in CAN communication circuit. If there's any short in harness, no signal is detected.





Check CAN low communication circuit
1. Ignition "ON" and Engine "OFF".
2. Connect scantool and select VEHICLE SCOPE METER function.
3. Measure waveform between terminal "B12" of BCM ECU and chassis ground.

Specification : CAN communication waveform is displayed





4. Is the measured waveform within specifications ?
** The existance of CAN communication waveform itself shows there's no trouble in CAN communication circuit. If there's any short in harness, no signal is detected