Description

Illumination output circuit malfunction

Detection condition

• Electrical supply unit (ESU) detects a short to ground in the illumination output circuit.

Fail-safe

Not applicable

Possible cause

• Electrical supply unit (ESU) connector or terminal malfunction

• Illuminations malfunction

• Short to ground in electrical supply unit (ESU) illumination output circuit

• Electrical supply unit (ESU) malfunction

Step

Inspection

Action

1

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the electrical supply unit (ESU) connector.

• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 4.

2

• Verify that the electrical supply unit (ESU) connector is disconnected.

• Turn the light switch to the TNS (parking lights) position.

• Inspect for continuity between electrical supply unit (ESU) terminal 2D (wiring harness-side) and body ground.

• Is there continuity?

Yes

Go to the next step.

No

Go to Step 4.

3

• Inspect the following parts:

• Cruise control switch (With cruise control switch)

  (See CRUISE CONTROL SWITCH INSPECTION [SKYACTIV-G 2.0].)

• Drive selection switch

  (See DRIVE SELECTION SWITCH INSPECTION [SKYACTIV-G 2.0].)

• Trunk lid opener switch (interior)

  (See TRUNK LID OPENER SWITCH INSPECTION.)

• Hazard warning switch

  (See HAZARD WARNING SWITCH INSPECTION.)

• Steering switch

  (See STEERING SWITCH INSPECTION.)

• Cluster switch

  (See DSC OFF SWITCH INSPECTION.)

  (See BLIND SPOT MONITORING (BSM) SWITCH INSPECTION.)

  (See LDWS SWITCH INSPECTION.)

• Are all parts normal?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Cruise control switch???Electrical supply unit (ESU) terminal 2D (With cruise control switch)

• Shift panel (indicator)???Electrical supply unit (ESU) terminal 2D (AT)

• Drive selection switch???Electrical supply unit (ESU) terminal 2D

• Trunk lid opener switch (interior)???Electrical supply unit (ESU) terminal 2D

• Hazard warning switch???Electrical supply unit (ESU) terminal 2D

• Audio unit???Electrical supply unit (ESU) terminal 2D (Without center display)

• Commander switch???Electrical supply unit (ESU) terminal 2D (With center display)

• CD player???Electrical supply unit (ESU) terminal 2D

• Steering switch???Electrical supply unit (ESU) terminal 2D

• Cluster switch???Electrical supply unit (ESU) terminal 2D

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to the next step.

No

Repair or replace the malfunctioning part, then go to the next step.

(See CRUISE CONTROL SWITCH REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

(See STEERING SWITCH REMOVAL/INSTALLATION.)

(See DRIVE SELECTION SWITCH REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

(See TRUNK LID OPENER SWITCH REMOVAL/INSTALLATION.)

(See HAZARD WARNING SWITCH REMOVAL/INSTALLATION.)

(See CLUSTER SWITCH REMOVAL/INSTALLATION.)

4

• Always reconnect all disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

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

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

• Turn the light switch to the TNS (parking lights) position.

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

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

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the electrical supply unit (ESU).

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

Go to the next step.

No

Go to the next step.

5

• 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.