W/Harness Inspection

Adaptive Front Lighting System

B1603 CAN Communication Bus Off - W/Harness Inspection

W/Harness 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?






CAN communication circuit inspection

Check CAN BUS Short to Ground
1. Ignition "OFF"
2. Disconnect CAN communication modules.(AFLS ECU, ECM, TCU, VDC ECU, EHPS, ECS,4WD, steering angle sensor)
3. Measure the resistance between CAN-HIGH terminal of DLC harness connector and and chassis ground
4. Measure the resistance between CAN-LOW terminal of DLC harness connector and and chassis ground

Specification : Discontinuity (Infinite Ohms)








5. Is the measured resistance within specification?





Check CAN BUS Short to battery
1. Ignition "OFF"
2. Disconnect CAN communication modules.(AFLS ECU, ECM, TCU, VDC ECU, EHPS, ECS,4WD, steering angle sensor).
3. Ignition "ON"
4. Measure the voltage between CAN-HIGH terminal of DLC harness connector and and chassis ground
5. Measure the voltage between CAN-LOW terminal of DLC harness connector and and chassis ground

Specification : below 0 V








6. Is "voltage" display near the specified value?





Check CAN BUS Open
1. Ignition "OFF
2. Disconnect CAN communication modules.(AFLS ECU, ECM, TCU, VDC ECU, EHPS, ECS,4WD, steering angle sensor).
3. Check continuity between CAN-HIGH terminal of DLC harness connector and CAN HIGH terminal of each module.
4. Check continuity between CAN-LOW terminal of DLC harness connector and CAN LOW terminal of each module.

Specification : Continuity (below 1.0 Ohms)

5. Is the measured resistance within specification?