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 "Signal Circuit Inspection" procedure.

IG "OFF"

Measure the resistance between CAN-HIGH and CAN-LOW terminals of data link connector (Measurement "A")

Disconnect ECM,Instrument Cluster, and ABS/ESC ECU connector.

Measure the resistance between CAN-HIGH and CAN-LOW terminals of data link connector (Measurement "B")

Is the measured resistance within specification ?

	▶ Go to "Check short to ground in CAN BUS" as follows.
	▶ Below 10Ω for both conditions(disconnected, connected) : Repair short between CAN BUS lines and go to "Verification of Vehicle Repair". ▶ 120Ω for both conditions(disconnected, connected) : Go to "Check CAN BUS continuity". ▶Infinite Ω for both conditions(disconnected, connected) :Repair open in CAN communication circuit between DLC terminal and In-pannel junction box.

IG "OFF" and disconnect ECM, Instrument Cluster and ABS/ESC ECU connector.

Check resistance between CAN-HIGH terminal of Data Link Connector and chassis ground. (CAN HIGH line)

Check resistance between CAN-LOW terminal of Data Link Connector and chassis ground. (CAN LOW line)

Is the measured resistance within specification ?

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

IG "OFF" and disconnect ECM, Instrument Cluster and ABS/ESC ECU connector.

IG "ON"

Measure the voltage between CAN-HIGH terminal of Data Link Connector and chassis ground. (CAN HIGH line)

Measure the voltage between CAN-LOW terminal of Data Link Connector and chassis ground. (CAN LOW line)

Is the measured voltage within specification ?

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

IG "OFF" and disconnect ECM, Instrument Cluster and ABS/ESC ECU connector.

Check resistance between CAN-HIGH terminal of Data Link Connector and CAN-HIGH terminal of each module.(Measurement "A")

Check resistance between CAN-LOW terminal of Data Link Connector and CAN-LOW terminal of each module.(Measurement "B")

Is the measured resistance within specification ?

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