Description

Electrical supply unit (ESU) internal malfunction

Detection condition

• The electrical supply unit (ESU) detected a watchdog malfunction in the electrical supply unit (ESU).

Fail-safe

Exterior lighting system

• When the ignition is switched ON (engine off or on), the headlights LO, TNS (parking lights), and panel light turn on and other exterior light controls are stopped.

Possible cause

• Electrical supply unit (ESU) malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

• Clear the DTC for the electrical supply unit (ESU) using the M-MDS.

  (See CLEARING DTC [ELECTRICAL SUPPLY UNIT (ESU)].)

• Retrieve the electrical supply unit (ESU) DTCs using the M-MDS.

  (See DTC INSPECTION [ELECTRICAL SUPPLY UNIT (ESU)].)

• Is the same DTC displayed?

Yes

Replace the electrical supply unit (ESU), then go to the next step.

(See ELECTRICAL SUPPLY UNIT (ESU) REMOVAL/INSTALLATION.)

No

Go to the next step.

2

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [ELECTRICAL SUPPLY UNIT (ESU)].)

No

DTC troubleshooting completed.