Description

DRL circuit malfunction

Detection condition

• Electrical supply unit (ESU) detects a short to ground in the DRL circuit with the ignition switched ON (engine off or on).

Fail-safe

Not applicable

Possible cause

• DRL bulb (LH) malfunction (bulb type)

• DRL bulb (RH) malfunction (bulb type)

• DRL (LH) connector or terminal malfunction

• DRL (RH) connector or terminal malfunction

• Electrical supply unit (ESU) connector or terminal malfunction

• Short to ground in wiring harness between the following terminals:

• Electrical supply unit (ESU) terminal 4J—DRL (LH) terminal A

• Electrical supply unit (ESU) terminal 4J—DRL (RH) terminal A

• DRL (LH) malfunction (LED type)

• DRL (RH) malfunction (LED type)

• Electrical supply unit (ESU) malfunction

Step

Inspection

Action

1

NOTE:

• For vehicles with DRL (LED type), go to Step 3.

• Visually inspect the DRL bulb (LH).

• Is the DRL bulb (LH) normal?

Yes

Go to the next step.

No

Replace the DRL bulb (LH), then go to Step 9.

(See DAYTIME RUNNING LIGHT (DRL) BULB REMOVAL/INSTALLATION.)

2

• Visually inspect the DRL bulb (RH).

• Is the DRL bulb (RH) normal?

Yes

Go to the next step.

No

Replace the DRL bulb (RH), then go to Step 9.

(See DAYTIME RUNNING LIGHT (DRL) BULB REMOVAL/INSTALLATION.)

3

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the DRL (LH) 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 9.

4

• Disconnect the DRL (RH) 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 9.

5

• 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 9.

6

• Verify that the DRL (LH)/(RH) and electrical supply unit (ESU) connectors are disconnected.

• Inspect for continuity between electrical supply unit (ESU) terminal 4J (wiring harness-side) and body ground.

• Is there continuity?

Yes

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

• Electrical supply unit (ESU) terminal 4J—DRL (LH) terminal A

• Electrical supply unit (ESU) terminal 4J—DRL (RH) terminal A

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 Step 9.

No

Bulb type:

• Go to Step 9.

LED type:

• Go to the next step.

7

• 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)].)

• 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 DRL (LH), then go to the next step.

(See DAYTIME RUNNING LIGHT (DRL) REMOVAL/INSTALLATION.)

No

Go to Step 10.

8

• 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 DRL (RH), then go to the next step.

(See DAYTIME RUNNING LIGHT (DRL) REMOVAL/INSTALLATION.)

No

Go to Step 10.

9

• 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)].)

• 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.

10

• 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.