Many malfunctions in the electrical system are caused by poor connection. 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.
	▶ Perform following procedures.

Connect all of control module connector.

Ignition "ON".

Make CAN communication is wake up status.

Measure signal waveform of C-CAN-HIGH terminal of A/C Control Module connector and chassis ground.

Measure signal waveform of C-CAN-LOW terminal of A/C Control Module connector and chassis ground.

Is measured value within specification?

	▶ Check poor connection between harness connector and A/C Control Module Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
	▶ Check for CAN(High) and CAN(Low) communication line and A/C Control Module, and repair as necessary and then go to "Verification of Vehicle Repair" procedure.