DTC 4/DTC B1043:01 [AFS (ADAPTIVE FRONT LIGHTING SYSTEM)]

id0902g9980100

DESCRIPTION

Front auto leveling sensor circuit malfunction
DETECTION CONDITION
•  Front auto leveling sensor circuit voltage is out of range for 10 s or more, while the ignition is ON.
POSSIBLE CAUSE
•  Front auto leveling sensor connector or terminals malfunction
•  AFS control module connector or terminals malfunction
•  Short to ground in wiring harness between the following terminals:
―  AFS control module terminal D—Front auto leveling sensor terminal A
―  AFS control module terminal G—Front auto leveling sensor terminal B
―  AFS control module terminal M—Front auto leveling sensor terminal C
•  Short to power supply in wiring harness between the following terminals:
―  AFS control module terminal D—Front auto leveling sensor terminal A
―  AFS control module terminal G—Front auto leveling sensor terminal B
―  AFS control module terminal M—Front auto leveling sensor terminal C
•  Front auto leveling sensor malfunction
•  Open circuit in wiring harness between the following terminals:
―  AFS control module terminal D—Front auto leveling sensor terminal A
―  AFS control module terminal G—Front auto leveling sensor terminal B
―  AFS control module terminal M—Front auto leveling sensor terminal C
•  AFS control module malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
INSPECT FRONT AUTO LEVELING SENSOR CONNECTOR AND TERMINALS
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the front auto leveling sensor connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 7.
No
Go to the next step.
2
INSPECT AFS CONTROL MODULE CONNECTOR AND TERMINALS
•  Disconnect the AFS control module connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 7.
No
Go to the next step.
3
INSPECT FRONT AUTO LEVELING SENSOR CIRCUIT FOR SHORT TO GROUND
•  Front auto leveling sensor and AFS control module connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Front auto leveling sensor terminal A
―  Front auto leveling sensor terminal B
―  Front auto leveling sensor terminal C
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 7.
No
Go to the next step.
4
INSPECT FRONT AUTO LEVELING SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  Front auto leveling sensor and AFS control module connectors are disconnected.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at the following terminals (wiring harness-side):
―  Front auto leveling sensor terminal A
―  Front auto leveling sensor terminal B
―  Front auto leveling sensor terminal C
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 7.
No
Go to the next step.
5
INSPECT FRONT AUTO LEVELING SENSOR
•  Switch the ignition to off.
•  Inspect the front auto leveling sensor.
•  Is there any malfunction?
Yes
Replace the front auto leveling sensor, then go to Step 7.
(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
No
Go to the next step.
6
INSPECT FRONT AUTO LEVELING SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Front auto leveling sensor and AFS control module connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  AFS control module terminal D—Front auto leveling sensor terminal A
―  AFS control module terminal G—Front auto leveling sensor terminal B
―  AFS control module terminal M—Front auto leveling sensor terminal C
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
7
VERIFY TROUBLESHOOTING COMPLETED
•  Make sure to reconnect the disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC from the AFS control module using the M-MDS.
•  Perform the DTC inspection.
•  Is the same DTC present?
Yes
Replace the AFS control module, then go to the next step.
(See AFS (ADAPTIVE FRONT LIGHTING SYSTEM) CONTROL MODULE REMOVAL/INSTALLATION.)
No
Go to the next step.
8
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [AFS (ADAPTIVE FRONT LIGHTING SYSTEM)].)
No
DTC troubleshooting completed.