Description

Back-up light circuit malfunction

Detection condition

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

Fail-safe

Not applicable

Possible cause

• Back-up light bulb (LH) malfunction

• Back-up light bulb (RH) malfunction

• Back-up light (LH) connector or terminal malfunction

• Back-up light (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 2Q—Back-up light (LH) terminal A

• Electrical supply unit (ESU) terminal 2Q—Back-up light (RH) terminal A

• Electrical supply unit (ESU) malfunction

Step

Inspection

Action

1

• Visually inspect the back-up light bulb (LH).

• Is the back-up light bulb (LH) normal?

Yes

Go to the next step.

No

Replace the back-up light bulb (LH), then go to Step 7.

(See BACK-UP LIGHT BULB REMOVAL/INSTALLATION.)

2

• Visually inspect the back-up light bulb (RH).

• Is the back-up light (RH) normal?

Yes

Go to the next step.

No

Replace the back-up light bulb (RH), then go to Step 7.

(See BACK-UP LIGHT BULB REMOVAL/INSTALLATION.)

3

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the back-up light (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 7.

4

• Disconnect the back-up light (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 7.

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 7.

6

• Verify that the back-up light (LH)/(RH) and electrical supply unit (ESU) connectors are disconnected.

• Inspect for continuity between electrical supply unit (ESU) terminal 2Q (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 2Q—Back-up light (LH) terminal A

• Electrical supply unit (ESU) terminal 2Q—Back-up light (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 the next step.

No

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)].)

• Perform the following operation.

• Shift the selector lever to the R position. (AT)

• Shift the shift lever to the reverse position. (MT)

• 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.

8

• 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.