DTC B1D13:12 [BCM]


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Malfunction Location

•  Interior light circuit malfunction

Detection Condition

•  Short to power supply in wiring harness between interior light and BCM

Possible Causes

•  Interior light connector or terminals malfunction
•  BCM connector or terminals malfunction
•  Short to power supply in wiring harness between interior light terminal F and BCM terminal 3I (vehicles with theft-deterrent system)
•  Short to power supply in wiring harness between interior light terminal C and BCM terminal 3I (vehicles without theft-deterrent system)
•  Interior light malfunction
•  BCM malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1
PERFORM DTC INSPECTION
•  Clear the DTCs using the M-MDS.
•  Turn the interior light switch on.
•  Perform the BCM DTC inspection using the M-MDS.
•  Is the DTC B1D13:12 displayed?
Yes
Go to the next step.
No
DTC troubleshooting completed.
2
VERIFY INTERIOR LIGHT CONNECTOR CONDITION
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable.
•  Disconnect the interior light connector.
•  Inspect the connection condition and wiring harness.
•  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?
Yes
Go to the next step.
No
Repair or replace the connector, then go to the final step.
3
VERIFY BCM CONNECTOR CONDITION
•  Disconnect the BCM connector.
•  Inspect the connection condition and wiring harness.
•  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?
Yes
Go to the next step.
No
Repair or replace the related wiring harness, then go to the final step.
4
VERIFY WIRING HARNESS BETWEEN INTERIOR LIGHT AND BCM FOR SHORT TO POWER SUPPLY
•  Interior light and BCM connectors are disconnected.
•  Reconnect the negative battery cable.
•  Measure the voltage at the BCM terminal 3I (wiring harness-side).
•  Is there any voltage?
Yes
Repair or replace the related wiring harness, then go to the final step.
No
Go to the next step.
5
VERIFY INTERIOR LIGHT CONDITION
•  Inspect the interior light.
•  Is the interior light normal?
Yes
Go to the next step.
No
Replace the interior light, then go to the final step.
6
VERIFY TROUBLESHOOTING COMPLETED
•  Reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTCs using the M-MDS.
•  Turn the interior light switch on.
•  Perform the BCM DTC inspection using the M-MDS.
•  Is the DTC B1D13:12 displayed?
Yes
Replace the BCM.
No
DTC troubleshooting completed.