7123162

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 "Check CAN communication Line" procedure.

Connect all of control module connector.

Make CAN communication is wake up status (Ex. . ON/OFF Door SW)

Measure signal waveform of B-CAN-HIGH terminal of SMK Module connector and chassis ground.

Measure signal waveform of B-CAN-LOW terminal of SMK Module connector and chassis ground.

Specification: Refer to Signal waveform and Data

Is the measured signal waveform normal?

▶ Check poor connection between harness connector and SMK unit:Thoroughly check the looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector.

▶ Disconnect BCM(IPM), SJB, SMK, PSM one by one and then, check that DTC is erased with GDS.

▶ Substitute with a known-good module and check for proper operation.

▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

▶ Go to next procedure.

▶ If the measured value is battery voltage, check short to battery in CAN line. Repair or replace as necessary.

And then, go to "Verification of Vehicle Repair" procedure. In case that Communication is in sleep mode, 12V will be measured. Therefore, check that communication is in Wake up status.

▶ If 0V is detected, Check short to ground, short between CAN high and low each other or open in CAN high or CAN low harness.

Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.