DTC B1044:01 [ADAPTIVE FRONT LIGHTING SYSTEM (AFS)]


id09021n934200

Description

Auto leveling sensor circuit malfunction

Detection condition
•  AFS control module detected the auto leveling sensor circuit voltage of 0.25 V or less or 4.75 V or more for 10 s or more with the ignition switched ON (engine off or on).
Fail-safe function
•  The swivel actuator is moved to the center.
•  The headlight leveling actuator is stopped at the position when the malfunction is determined.
Possible cause
•  Auto leveling sensor connector or terminal malfunction
•  AFS control module connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  AFS control module terminal I—Auto leveling sensor terminal C
―  AFS control module terminal K—Auto leveling sensor terminal B
―  AFS control module terminal C—Auto leveling sensor terminal A
•  Short to power supply in wiring harness between the following terminals:
―  AFS control module terminal I—Auto leveling sensor terminal C
―  AFS control module terminal K—Auto leveling sensor terminal B
―  AFS control module terminal C—Auto leveling sensor terminal A
•  Open circuit in wiring harness between the following terminals:
―  AFS control module terminal I—Auto leveling sensor terminal C
―  AFS control module terminal K—Auto leveling sensor terminal B
―  AFS control module terminal C—Auto leveling sensor terminal A
•  Auto leveling sensor malfunction
•  AFS control module malfunction

Diagnostic Procedure

Step

Inspection

Action

1
INSPECT AUTO LEVELING SENSOR CONNECTOR CONDITION
•  Switch the ignition off.
•  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 AFS CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the AFS 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 FOR SHORT TO GROUND IN AUTO LEVELING SENSOR CIRCUIT
•  Verify that the auto leveling sensor and AFS control module connectors are disconnected.
•  Inspect for continuity between the following terminals (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
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  AFS control module terminal I—Auto leveling sensor terminal C
•  AFS control module terminal K—Auto leveling sensor terminal B
•  AFS control module terminal C—Auto leveling sensor terminal A
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.
4
INSPECT FOR SHORT TO POWER SUPPLY IN AUTO LEVELING SENSOR CIRCUIT
•  Verify that the auto leveling sensor and AFS control module connectors are disconnected.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminals (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
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  AFS control module terminal I—Auto leveling sensor terminal C
•  AFS control module terminal K—Auto leveling sensor terminal B
•  AFS control module terminal C—Auto leveling sensor terminal A
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 Step 7.
5
INSPECT FOR OPEN CIRCUIT IN AUTO LEVELING SENSOR CIRCUIT
•  Verify that the auto leveling sensor and AFS control module connectors are disconnected.
•  Switch the ignition off.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  AFS control module terminal I—Auto leveling sensor terminal C
―  AFS control module terminal K—Auto leveling sensor terminal B
―  AFS control module terminal C—Auto leveling sensor terminal A
•  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 the following terminals:
•  AFS control module terminal I—Auto leveling sensor terminal C
•  AFS control module terminal K—Auto leveling sensor terminal B
•  AFS control module terminal C—Auto leveling sensor terminal A
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
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.
7
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the DTC for the AFS control module using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 10 s or more.
•  Retrieve the AFS 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 AFS control module.
Go to the next step.
No
Go to the next step.
8
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.