DTC B1D00:13 [HEADLIGHT AUTO LEVELING SYSTEM]

id0902i7060000

Description

Headlight (LH) circuit malfunction
Detection condition
•  The auto leveling control module detected an open circuit in the headlight (LH) circuit during the headlight LO on control with the ignition switched ON (engine off or on).
Fail-safe
•  Control of the headlight auto leveling system is continued.
Possible cause
•  DTCs are stored in the electrical supply unit (ESU).
―  Headlight LO (LH) circuit malfunction
•  Front combination light (LH) connector or terminal malfunction
•  Auto leveling control module connector or terminal malfunction
•  Short to ground in wiring harness between auto leveling control module terminal I and front combination light (LH) terminal K
•  Open circuit in wiring harness between auto leveling control module terminal I and front combination light (LH) terminal K
•  Front combination light (LH) malfunction
•  Auto leveling control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY ELECTRICAL SUPPLY UNIT (ESU) DTCs
•  Retrieve the electrical supply unit (ESU) DTCs using the M-MDS.
•  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
Go to the next step.
2
INSPECT FRONT COMBINATION LIGHT (LH) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the front combination 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.
3
INSPECT AUTO LEVELING CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the auto leveling control module 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
INSPECT HEADLIGHT (LH) MALFUNCTION DETECTION CIRCUIT FOR SHORT TO GROUND
•  Verify that the front combination light (LH) and auto leveling control module connectors are disconnected.
•  Inspect for continuity between front combination light (LH) terminal K (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 auto leveling control module terminal I and front combination light (LH) terminal K.
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 Step 7.
No
Go to the next step.
5
INSPECT HEADLIGHT (LH) MALFUNCTION DETECTION CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition off.
•  Verify that the front combination light (LH) and auto leveling control module connectors are disconnected.
•  Inspect the wiring harness for continuity between auto leveling control module terminal I (wiring harness-side) and front combination light (LH) terminal K (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between auto leveling control module terminal I and front combination light (LH) terminal K.
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 an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 7.
6
VERIFY IF MALFUNCTIONING LOCATION IS FRONT COMBINATION LIGHT (LH) DEPENDING ON REPEATABILITY
•  Always reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Clear the DTC for the auto leveling control module using the M-MDS.
•  Operate the light switch to the HEAD position and the dimmer switch to the LO position.
•  Switch the ignition ON (engine off or on) and wait for 5 s or more.
•  Retrieve the auto leveling control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the front combination light (LH), then go to the next step.
(See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
No
Go to Step 8.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Clear the DTC for the auto leveling control module using the M-MDS.
•  Operate the light switch to the HEAD position and the dimmer switch to the LO position.
•  Switch the ignition ON (engine off or on) and wait for 5 s or more.
•  Retrieve the auto leveling control module DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the auto leveling control module.
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 [HEADLIGHT AUTO LEVELING SYSTEM].)
No
DTC troubleshooting completed.