DTC B1313:12 [ELECTRICAL SUPPLY UNIT (ESU)]

id0902ff061600

Description

Front map light circuit malfunction
Detection condition
•  Electrical supply unit (ESU) detects a short to power supply in the front map light circuit.
Fail-safe
Not applicable
Possible cause
•  Front map light malfunction
―  Front map light bulb malfunction
―  Front map light malfunction
•  Front map light connector or terminal malfunction
•  Electrical supply unit (ESU) connector or terminal malfunction
•  Short to power supply in wiring harness between the following terminals:
―  Front map light terminal C—Electrical supply unit (ESU) terminal 2L (Single light type)
―  Front map light terminal H—Electrical supply unit (ESU) terminal 2L (Dual light type)
•  Electrical supply unit (ESU) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT FRONT MAP LIGHT
•  Inspect the front map light.
•  Is the front map light normal?
Yes
Go to the next step.
No
Replace the front map light bulb or front map light, then go to Step 5.
(See FRONT MAP LIGHT BULB REMOVAL/INSTALLATION.)
(See FRONT MAP LIGHT REMOVAL/INSTALLATION.)
2
INSPECT FRONT MAP LIGHT CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the front 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
INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION
•  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
INSPECT FRONT MAP LIGHT CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the front map light and electrical supply unit (ESU) connectors are disconnected.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Front map light terminal C (Single light type)
―  Front map light terminal H (Dual light type)
•  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 the following terminals:
•  Front map light terminal C—Electrical supply unit (ESU) terminal 2L (Single light type)
•  Front map light terminal H—Electrical supply unit (ESU) terminal 2L (Dual light type)
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
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Clear the DTC for the electrical supply unit (ESU) using the M-MDS.
•  Operate the room light switch to DOOR position,
•  Retrieve the electrical supply unit (ESU) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the electrical supply unit (ESU).
Go to the next step.
No
Go to the next step.
6
VERIFY IF OTHER DTCs DISPLAYED
•  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.