Description

Map light circuit malfunction

Detection condition

• Electrical supply unit (ESU) detects a short to power supply in the map light circuit.

Fail-safe

Not applicable

Possible cause

• Map light malfunction

• Map light bulb malfunction

• Map light malfunction

• Map light connector or terminal malfunction

• Electrical supply unit (ESU) connector or terminal malfunction

• Short to power supply in wiring harness between map light terminal B and electrical supply unit (ESU) terminal 2L

• Electrical supply unit (ESU) malfunction

Step

Inspection

Action

1

• Inspect the map light.

  (See MAP LIGHT INSPECTION.)

• Is the map light normal?

Yes

Go to the next step.

No

Replace the map light bulb or map light, then go to Step 5.

(See MAP LIGHT BULB REMOVAL/INSTALLATION.)

(See MAP LIGHT REMOVAL/INSTALLATION.)

2

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the map light 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 5.

3

• 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 5.

4

• Verify that the map light and electrical supply unit (ESU) connectors are disconnected.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Switch the ignition ON (engine off or on).

• Measure the voltage at map light terminal B (wiring harness-side).

• Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between map light terminal B and electrical supply unit (ESU) terminal 2L.

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 power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

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

Go to the next step.

5

• 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)].)

• Operate the room light switch to DOOR 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.

6

• 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.