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.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
	▶ Go to "CAN communication circuit inspection" procedure.

Connect all kinds of modules related to CAN communication.

IG KEY "ON" or Engine "ON"

Measure signal waveform between terminal C-CAN-HIGH of cluster module harness connector and chassis ground.

Measure signal waveform between terminal C-CAN-LOW of cluster module harness connector and chassis ground.

Fig.1) CAN LOW and CAN HIGH Commnication Waveform

Are the measured signal waveforms OK?

	▶ Go to next procedure.
	▶ Check for open or short in the circuit. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

Ignition "OFF".

Disconnect AFLS ECU connector and Cluster connector.

Measure the resistance between CAN-HIGH terminal of AFLS ECU harness connector and CAN-HIGH terminal of Cluster.

Measure the resistance between CAN-LOW terminal of AFLS ECU harness connector and CAN-LOW terminal of Cluster.

Is the measured resistance within specification ?

	▶ Substitute with a known - good ECU(AFLS ECU or Cluster) and check for proper operation. If the problem is corrected, replace ECU and go to "Verification of Vehicle Repair" procedure.
	▶ Check for open/short in harness. ▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.