DTC B1044:01 [ADAPTIVE LED HEADLIGHTS CONTROL MODULE]

id1502c1000700

System malfunction location

Auto leveling sensor circuit malfunction
Detection condition
•  Auto leveling sensor circuit voltage of 0.25 V or less or 4.75 V or more is detected by adaptive LED headlights control module for 10 s or more with the ignition switched ON (engine off or on).
Fail-safe
•  When the setting is on using the personalization feature, the headlights HI turn on. (When setting is off using personalization feature, headlight HI illumination on/off depends on control by front body control module (FBCM))
•  The headlight leveling actuator is stopped at the position when the malfunction is determined.
Possible cause
•  Auto leveling sensor connector or terminal malfunction
•  Adaptive LED headlights control module connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Adaptive LED headlights control module terminal F and auto leveling sensor terminal C
―  Adaptive LED headlights control module terminal T and auto leveling sensor terminal B
―  Adaptive LED headlights control module terminal J and auto leveling sensor terminal A
•  Short to power supply in wiring harness between the following terminals:
―  Adaptive LED headlights control module terminal F and auto leveling sensor terminal C
―  Adaptive LED headlights control module terminal T and auto leveling sensor terminal B
―  Adaptive LED headlights control module terminal J and auto leveling sensor terminal A
•  Open circuit in wiring harness between the following terminals:
―  Adaptive LED headlights control module terminal F and auto leveling sensor terminal C
―  Adaptive LED headlights control module terminal T and auto leveling sensor terminal B
―  Adaptive LED headlights control module terminal J and auto leveling sensor terminal A
•  Auto leveling sensor malfunction
•  Adaptive LED headlights control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT AUTO LEVELING SENSOR CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the auto leveling sensor 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.
2
INSPECT ADAPTIVE LED HEADLIGHTS CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the adaptive LED headlights 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.
3
INSPECT AUTO LEVELING SENSOR CIRCUIT FOR SHORT TO GROUND
•  Verify that the auto leveling sensor and adaptive LED headlights control module connectors are disconnected.
•  Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.
―  Auto leveling sensor terminal C
―  Auto leveling sensor terminal B
―  Auto leveling sensor terminal A
•  Is there continuity?
Yes
Repair or replace the wiring harness which is shorted to ground, then go to Step 7.
No
Go to the next step.
4
INSPECT AUTO LEVELING SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the auto leveling sensor and adaptive LED headlights control module connectors are disconnected.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (vehicle wiring harness side).
―  Auto leveling sensor terminal C
―  Auto leveling sensor terminal B
―  Auto leveling sensor terminal A
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness which is shorted to power supply, then go to Step 7.
5
INSPECT AUTO LEVELING SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Verify that the auto leveling sensor and adaptive LED headlights control module connectors are disconnected.
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Inspect the wiring harness between the following terminals (vehicle wiring harness side) for continuity.
―  Adaptive LED headlights control module terminal F and auto leveling sensor terminal C
―  Adaptive LED headlights control module terminal T and auto leveling sensor terminal B
―  Adaptive LED headlights control module terminal J and auto leveling sensor terminal A
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness which has an open circuit, then go to Step 7.
6
INSPECT AUTO LEVELING SENSOR
•  Inspect the auto leveling sensor.
•  Is the auto leveling sensor normal?
Yes
Go to the next step.
No
Replace the auto leveling sensor, then go to the next step.
(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Reconnect all the disconnected connectors.
•  Reconnect the disconnected negative battery cable.
•  Clear the adaptive LED headlights control module DTCs using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 10 s or more.
•  Perform the DTC inspection for the adaptive LED headlights control module using the M-MDS.
•  Is DTC B1044:01 displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the adaptive LED headlights control module, then go to the next step.
No
Go to the next step.
8
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ADAPTIVE LED HEADLIGHTS CONTROL MODULE].)
No
DTC troubleshooting completed.