No.1 AUTO LEVELING WARNING LIGHT ILLUMINATES WHEN THE IGNITION SWITCH TURNED TO ON POSITION [HEADLIGHT AUTO LEVELING SYSTEM]

id0903d0930100

1 | Auto leveling warning light illuminates when the ignition switch turned to ON position
POSSIBLE CAUSE | • Headlight auto leveling function related electrical part the malfunction ― Front and/or rear auto leveling sensor related part the malfunction • Front and/or rear auto leveling sensor power supply voltage excessive low • Front and/or rear auto leveling sensor signal voltage excessive high or low • Front and/or rear auto leveling sensor the malfunction ― Auto leveling control module malfunction ― Auto leveling control module power supply voltage is excessive high • Vehicle speed signal is above 180 km/h {112 mph} or more ― Instrument cluster malfunction ― Short to power supply circuit between instrument cluster terminal 2O and auto leveling control module terminal R • Auto leveling warning light control circuit the malfunction ― Instrument cluster malfunction ― Short to GND between instrument cluster terminal 2J and auto leveling control module terminal V

Diagnostic Procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY THAT THE FRONT AND REAR AUTO LEVELING SENSER INSTALLATION • Verify that the front and rear auto leveling sensor installation. • Is there any bend, damage or dislocated link at the bracket? | Yes | Repair or replace the malfunctioning part.
No | Go to the next step.
2 | INSPECT AUTO LEVELING CONTROL MODULE POWER SUPPLY VOLTAGE • Turn the ignition switch to ON position. • Measure the voltage between auto leveling control module terminal H and GND. • Is the voltage B+? | Yes | Go to the next step.
No | Repair or replace for open circuit between the ignition switch and auto leveling control module terminal H.
3 | INSPECT AUTO LEVELING CONTROL MODULE GND CIRCUIT FOR OPEN • Turn the ignition switch to OFF. • Disconnect the auto leveling control module connector. • Verify that continuity between auto leveling control module terminal F and GND. • Is there continuity? | Yes | Connector the auto leveling control module connector, then go to Step 5.
No | Go to the next step.
4 | INSPECT GND POINT • Verify that the GND point for auto leveling control module. • Is there loose or poor connection at GND point? | Yes | Retighten the GND point.
No | Repair or replace for open circuit between auto leveling control module terminal F and GND.
5 | INSPECT IF THE MALFUNCTION IS IN FRONT AUTO LEVELING SENSOR OR ELSEWHERE • Turn the ignition switch to ON position. • Turn the headlight to ON. • Measure the voltage between auto leveling control module terminal G and GND. • Is the voltage 0.25—4.75 V? | Yes | Go to the next step.
No | Go to Step 9.
6 | INSPECT IF THE MALFUNCTION IS IN REAR AUTO LEVELING SENSOR OR ELSEWHERE • Turn the ignition switch to ON position. • Turn the headlight to ON. • Measure the voltage between auto leveling control module terminal E and GND. • Is the voltage 0.25—4.75 V? | Yes | Go to Step 11.
No | Go to the next step.
7 | INSPECT THE REAR AUTO LEVELING SENSOR SIGNAL CIRCUIT • Inspect the wiring harness between auto leveling control module terminal E and rear auto leveling sensor terminal D. • Is there open or short circuit detected? | Yes | Repair or replace for open short circuit.
No | Go to the next step.
8 | INSPECT REAR AUTO LEVELING SENSOR • Inspect the rear auto leveling sensor. (See REAR AUTO LEVELING SENSOR INSPECTION.) • Is the rear auto leveling sensor normal? | Yes | Repair or replace for open circuit at following. • Between auto leveling control module terminal M and rear auto leveling sensor terminal A. • Between auto leveling control module terminal D and rear auto leveling sensor terminal B.
No | Replace the rear auto leveling sensor. (See REAR AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
9 | INSPECT IF THE MALFUNCTION IS IN AUTO LEVELING SENSOR POWER OR GND CIRCUIT OR ELSEWHERE • Turn the ignition switch to ON position. • Turn the headlight to ON. • Measure the voltage between auto leveling control module terminal E and GND. • Is the voltage 0.25—4.75 V? | Yes | Go to the next step.
No | Repair or replace for open circuit at following. • Between auto leveling control module terminal M and front auto leveling sensor terminal A. • Between auto leveling control module terminal M and rear auto leveling sensor terminal A. • Between auto leveling control module terminal D and front auto leveling sensor terminal D. • Between auto leveling control module terminal D and rear auto leveling sensor terminal B.
10 | INSPECT FRONT AUTO LEVELING SENSOR SIGNAL CIRCUIT • Inspect the wiring harness between auto leveling control module terminal G and front auto leveling control sensor terminal C. • Is there open or short circuit detected? | Yes | Repair or replace for open or short circuit.
No | Inspect the front auto leveling sensor. Replace the malfunctioning part. (See FRONT AUTO LEVELING SENSOR INSPECTION.) (See FRONT AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
11 | INSPECT IF THE MALFUNCTION IS IN AUTO LEVELING WARNING LIGHT CONTROL CIRCUIT OR ELSEWHERE • Turn the ignition switch to OFF. • Disconnect the auto leveling control module and instrument cluster connectors. • Verify that continuity between auto leveling control module terminal V and GND. • Is there continuity? | Yes | Repair or replace for short to GND circuit.
No | Go to the next step.
12 | INSPECT IF THE MALFUNCTION IS IN INSTRUMENT CLUSTER • Turn the ignition switch to OFF. • Connect the instrument cluster connector (with auto leveling control module connector disconnected). • Short to GND at auto leveling control module terminal V using the jumper wire. • Turn the ignition switch to ON position. • Dose the auto leveling warning light illuminate? | Yes | Go to the next step.
No | Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
13 | INSPECT IF THE MALFUNCTION IS IN VEHICLE SPEED SIGNAL CIRCUIT OR ELSEWHERE • Turn the ignition switch to OFF. • Disconnect the auto leveling control module connector. • Turn the ignition switch to ON position. • Measure the voltage between auto leveling control module terminal R and GND. • Is the voltage B+? | Yes | Repair or replace for short to power supply.
No | Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)