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.

Ignition "OFF"

Disconnect CAN communication modules.(TCM, ECM, ECS, ABS/ESP/TCS,SAS/EPS, SRS, EPB, Cluster, LKAS, SMK ,SPAS, FATC, AAF, TPMS)

Measure the resistance between CAN-HIGH terminal of DLC harness connector and and chassis ground.

Measure the resistance between CAN-LOW terminal of DLC harness connector and and chassis ground.

Is the measured resistance within specification ?

	▶ Go to "Check CAN BUS Short to battery".
	▶ Repair short to ground in circuit and go to "Verification of Vehicle Repair".

Ignition "OFF"

Disconnect CAN communication modules.(TCM, ECM, ECS, ABS/ESP/TCS,SAS/EPS, SRS, EPB, Cluster, LKAS, SMK ,SPAS, FATC, AAF, TPMS)

Ignition "ON"

Measure the voltage between CAN-HIGH terminal of DLC harness connector and and chassis ground

Measure the voltage between CAN-LOW terminal of DLC harness connector and and chassis ground

Is "voltage" display near the specified value?

	▶ Go to "Check CAN BUS Open".
	▶ Repair short to battery and go to "Verification of Vehicle Repair".

Ignition "OFF.

Disconnect CAN communication modules.(TCM, ECM, ECS, ABS/ESP/TCS,SAS/EPS, SRS, EPB, Cluster, LKAS, SMK ,SPAS, FATC, AAF, TPMS)

Check continuity between CAN-HIGH terminal of DLC harness connector and CAN HIGH terminal of each module.

Check continuity between CAN-LOW terminal of DLC harness connector and CAN LOW terminal of each module.

Is the measured resistance within specification ?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open in CAN BUS and go to "Verification of Vehicle Repair".