No.4 AFS OFF LIGHT FLASHES OR AUTO LEVELING WARNING LIGHT ILLUMINATES WHEN THE IGNITION IS SWITCHED TO ON [AFS (ADAPTABLE FRONT LIGHTING SYSTEM)]

id0903c6913900

4
AFS OFF light flashes or auto leveling warning light illuminates when the ignition is switched to ON
DESCRIPTION
•  AFS OFF light flashes when the ignition is switched to ON
•  Auto leveling warning light illuminates when the ignition is switched to ON.
POSSIBLE CAUSE
•  Headlight auto leveling function related electrical part malfunction
―  Steering angle signal
•  Steering angle sensor malfunction
•  Communication error between BCM and AFS control module
•  Steering angle sensor initialization procedure is not completed.
―  Front auto leveling sensor related part malfunction
•  Power supply voltage is low
•  Output signal excessively high or low
•  Front auto leveling sensor malfunction
•  AFS initialization procedure is not completed.
―  Rear auto leveling sensor related part malfunction
•  Power supply voltage is low
•  Output signal excessively high or low
•  Rear auto leveling sensor malfunction
•  AFS initialization procedure is not completed.
―  AFS control module malfunction
―  AFS control module power supply voltage excessively high
•  Headlight auto leveling warning light illumination circuit malfunction
―  Instrument cluster malfunction
―  Communication error between AFS control module and Instrument cluster

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT AFS CONTROL MODULE POWER SUPPLY VOLTAGE
•  Switch the ignition to ON.
•  Measure the voltage between AFS control module terminals H/T and ground.
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect and repair or replace the malfunctioning part for an open circuit between the ignition switch (push start) and AFS control module terminals H/T.
2
INSPECT AFS GROUND CIRCUIT FOR OPEN CIRCUIT
•  Switch the ignition to off.
•  Disconnect the AFS control module connector.
•  Verify the continuity between the AFS control module wiring harness-side connector terminal F and ground.
•  Is there continuity?
Yes
Connect the AFS control module connector, then go to the next step.
No
Inspect and repair for a loose or poor connection in the AFS control module ground point.
3
VERIFY THAT AFS OFF LIGHT STATUS
•  Switch the ignition to ON.
•  Verify that the AFS OFF light status.
•  Does the AFS OFF light flash?
Yes
Go to the next step.
No
Go to Step 8.
4
VERIFY IF MALFUNCTION IS STEERING ANGLE SENSOR INITIALIZATION PROCEDURE UNCOMPLETED OR ELSEWHERE
•  Perform the steering angle sensor initialization procedure.
•  Switch the ignition to ON.
•  Verify that the AFS OFF light status.
•  Does the AFS OFF light flash?
Yes
Go to the next step.
No
Troubleshooting is completed.
(The cause of trouble is that the steering angle sensor initialization procedure is not completed.)
5
VERIFY IF MALFUNCTION IS AFS INITIALIZATION PROCEDURE UNCOMPLETED OR ELSEWHERE
•  Perform the AFS initialization procedure.
•  Switch the ignition to ON.
•  Verify that the AFS OFF light status.
•  Does the AFS OFF light flash?
Yes
Go to the next step.
No
Troubleshooting is completed.
(The cause of trouble is that the AFS initialization procedure is not completed.)
6
INSPECT IF MALFUNCTION IS IN COMMUNICATION BETWEEN AFS CONTROL MODULE AND INSTRUMENT CLUSTER OR ELSEWHERE
•  Retrieve the DTCs for the PCM, BCM and the instrument cluster using the M-MDS.
•  Are the following DTCs displayed?
―  PCM: U0073:00, U0104:00, U0155:00
―  BCM: U0001:88
―  Instrument cluster:U0001-88, U0100:00, U0140:00
Yes
Go to the applicable DTC inspection.
No
Go to the next step.
7
INSPECT STEERING ANGLE SENSOR
•  Inspect the steering angle sensor.
•  Is the steering angle sensor normal?
Yes
Go to the next step.
No
Replace the steering angle sensor.
(See COMBINATION SWITCH REMOVAL/INSTALLATION.)
8
INSPECT FRONT AND REAR AUTO LEVELING SENSOR INSTALLATION
•  Inspect the front and rear auto leveling sensor installation.
•  Is there any bending, damage or dislocated links at the bracket?
Yes
Repair or replace the malfunctioning part.
No
Go to the next step.
9
INSPECT IF MALFUNCTION IS IN FRONT AUTO LEVELING SENSOR OR ELSEWHERE
•  Switch the ignition to ON.
•  Turn the headlights on.
•  Measure the voltage between AFS control module terminal G and ground.
•  Is the voltage 0.5—4.5V?
Yes
Go to the next step.
No
Go to Step 8.
10
INSPECT IF MALFUNCTION IS IN REAR AUTO LEVELING SENSOR OR ELSEWHERE
•  Turn the headlights on.
•  Measure the voltage between AFS control module terminal E and ground.
•  Is the voltage 0.5—4.5V?
Yes
Go to Step 10.
No
Go to the next step.
11
INSPECT REAR AUTO LEVELING SENSOR SIGNAL RELATED CIRCUIT
•  Inspect for an open or short t circuit in the wiring harness between AFS control module terminal E and rear auto leveling sensor terminal B.
•  Is an open or short circuit detected?
Yes
Repair or replace the malfunctioning part for an open or short circuit.
No
Go to the next step.
12
INSPECT REAR AUTO LEVELING SENSOR
•  Inspect the rear auto leveling sensor.
•  Is the rear auto leveling sensor normal?
Yes
Repair or replace the malfunctioning part for an open circuit in the following:
•  Between AFS control module terminal M and rear leveling sensor terminal C
•  Between AFS control module terminal D and rear auto leveling sensor terminal A
No
Replace the rear auto leveling sensor.
(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
13
INSPECT IF MALFUNCTION IS IN FRONT AUTO LEVELING SENSOR POWER OR GROUND CIRCUIT OR ELSEWHERE
•  Switch the ignition to off.
•  Disconnect the front and rear auto leveling sensor connectors.
•  Switch the ignition to ON.
•  Turn the headlights on.
•  Measure the voltage between front auto leveling sensor terminals A and C at the wiring harness-side connector.
•  Is the voltage 0.5—4.5V?
Yes
Go to the next step.
No
Inspect for an open or short circuit in the following:
•  Between AFS control module terminal M and front auto leveling sensor terminal C
•  Between AFS control module terminal M and rear auto leveling sensor terminal C
•  Between AFS control module terminal D and front auto leveling sensor terminal A
•  Between AFS control module terminal D and rear auto leveling sensor terminal A
Repair or replace the malfunctioning part for an open or short circuit.
14
INSPECT FRONT AUTO LEVELING SENSOR SIGNAL CIRCUIT FOR OPEN OR SHORT CIRCUIT
•  Inspect for an open or short circuit in the wiring harness between AFS control module terminal G and front auto leveling sensor terminal B
•  Is an open or short circuit detected?
Yes
Repair or replace malfunctioning part for an open or short circuit.
No
Inspect the front auto leveling sensor.
If it is malfunctioning, replace the front auto leveling sensor.
(See AUTO LEVELING SENSOR INSPECTION.)
(See AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
15
INSPECT IF MALFUNCTION IS IN INSTRUMENT CLUSTER OR AFS CONTROL MODULE
•  Inspect the instrument cluster.
•  Is the instrument cluster normal?
Yes
Replace the AFS control module.
(See AFS (ADAPTIVE FRONT LIGHTING SYSTEM) CONTROL MODULE REMOVAL/INSTALLTION.)
No
Replace the instrument cluster.