DTC B111E:12 [ELECTRICAL SUPPLY UNIT (ESU)]

id0902ff060900

Description

Trunk compartment light circuit malfunction
Detection condition
•  Electrical supply unit (ESU) detects a short to power supply in the trunk compartment light circuit.
Fail-safe
Not applicable
Possible cause
•  Trunk compartment light bulb malfunction
•  Trunk compartment light connector or terminal malfunction
•  Trunk compartment light malfunction
•  Electrical supply unit (ESU) connector or terminal malfunction
•  Short to power supply in wiring harness between trunk compartment light terminal B and electrical supply unit (ESU) terminal 2F
•  Electrical supply unit (ESU) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VISUALLY INSPECT TRUNK COMPARTMENT LIGHT BULB
•  Visually inspect the trunk compartment light bulb.
•  Is the trunk compartment light bulb normal?
Yes
Go to the next step.
No
Replace the trunk compartment light bulb, then go to Step 6.
(See TRUNK COMPARTMENT LIGHT BULB REMOVAL/INSTALLATION.)
2
INSPECT TRUNK COMPARTMENT LIGHT CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the trunk compartment 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 6.
3
INSPECT TRUNK COMPARTMENT LIGHT
•  Inspect the trunk compartment light.
•  Is the trunk compartment light normal?
Yes
Go to the next step.
No
Replace the trunk compartment light, then go to Step 6.
(See TRUNK COMPARTMENT LIGHT REMOVAL/INSTALLATION.)
4
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 6.
5
INSPECT TRUNK COMPARTMENT LIGHT CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the trunk compartment 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 trunk compartment 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 trunk compartment light terminal B and electrical supply unit (ESU) terminal 2F.
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.
6
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.
•  Open the trunk.
•  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.
7
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.