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

id0903d0909400

1 | Headlight 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 headlight auto leveling sensor related part the malfunction • Front and/or rear headlight auto leveling control module power supply voltage excessive low • Front and/or rear headlight auto leveling sensor signal voltage excessive high or low • Front and/or rear headlight auto leveling sensor the malfunction ― Headlight leveling actuator (RH or LH) (built-in front combination light) related part the malfunction • Headlight leveling actuator (RH or LH) related circuit malfunction • Headlight leveling actuator (RH or LH) malfunction ― Headlight auto leveling control module the malfunction ― Headlight auto leveling control module power supply voltage is excessive high • Vehicle speed signal is above 180 km/h {112mph} or more ― Instrument cluster the malfunction ― Short to power supply circuit between instrument cluster terminal 1O and headlight auto leveling control module terminal A • Headlight auto leveling warning light control circuit the malfunction ― Instrument cluster the malfunction ― Short to GND between instrument cluster terminal 1A and headlight auto leveling control module terminal C

Diagnostic Procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | VERIFY THAT THE FRONT AND REAR AUTO LEVELING SENSOR 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 at auto leveling control module terminal AC. • 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 AC.
3 | INSPECT AUTO LEVELING CONTROL MODULE GND CIRCUIT FOR OPEN • Turn the ignition switch to OFF position. • Disconnect the auto leveling control module connector. • Verify that continuity at headlight auto leveling control module terminal V. • Is there continuity? | Yes | Connector the headlight 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 at auto leveling control module terminal V.
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 at auto leveling control module terminal P. • 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 N. • Is the voltage 0.25—4.75 V? | Yes | Go to Step 11.
No | Go to the next step.
7 | INSPECT THE REAR HEADLIGHT AUTO LEVELING SENSOR SIGNAL CIRCUIT • Inspect the wiring harness between headlight auto leveling control module terminal N and rear headlight auto leveling sensor terminal B. • Is there open or short circuit detected? | Yes | Repair or replace for open short circuit.
No | Go to the next step.
8 | INSPECT REAR HEADLIGHT AUTO LEVELING SENSOR • Inspect the rear headlight auto leveling sensor. (See REAR AUTO LEVELING SENSOR INSPECTION.) • Is the rear headlight auto leveling sensor normal? | Yes | Repair or replace for open circuit at following. • Between auto leveling control module terminal J and rear auto leveling sensor terminal A. • Between auto leveling control module terminal R and rear auto leveling sensor terminal C.
No | Replace the rear leveling sensor. (See REAR AUTO LEVELING SENSOR REMOVAL/INSTALLATION.)
9 | INSPECT IF THE MALFUNCTION IS IN REAR AUTO LEVELING SENSOR POWER OR GND CIRCUIT OR ELSEWHERE • Turn the ignition switch to ON position. • Turn the headlight to ON. • Measure the voltage at headlight auto leveling control module terminal N. • 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 L and front auto leveling sensor terminal A. • Between auto leveling control module terminal J and rear auto leveling sensor terminal A. • Between auto leveling control module terminal T and front auto leveling sensor terminal C. • Between auto leveling control module terminal R and rear auto leveling sensor terminal C.
10 | INSPECT FRONT AUTO LEVELING SENSOR SIGNAL CIRCUIT • Inspect the wiring harness between auto leveling control module terminal P and front auto leveling sensor terminal B. • Is there open or short circuit detected? | Yes | Repair or replace for open or short circuit.
No | Inspect the front auto leveling sensor. (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 position. • Disconnect the headlight auto leveling control module and instrument cluster connectors. • Verify that continuity between auto leveling control module terminal C 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 position. • Connect the instrument cluster connector (with auto leveling control module connector disconnected). • Short to GND at auto leveling control module terminal C 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 position. • Disconnect the auto leveling control module connector. • Turn the ignition switch to ON position. • Measure the voltage at auto leveling control module terminal A. • Is the voltage B+? | Yes | Repair or replace for short to power supply.
No | Go to the next step.
14 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS BETWEEN AUTO LEVELING CONTROL MODULE AND HEADLIGHT LEVELING ACTUATOR • Inspect for open or short circuit in wiring harness. RH: ― Auto leveling control module terminal AB—headlight leveling actuator (RH) terminal F ― Auto leveling control module terminal Z—headlight leveling actuator (RH) terminal E ― Auto leveling control module terminal X—headlight leveling actuator (RH) terminal D LH: ― Auto leveling control module terminal AA—headlight leveling actuator (LH) terminal F ― Auto leveling control module terminal Y—headlight leveling actuator (LH) terminal E ― Auto leveling control module terminal W—headlight leveling actuator (LH) terminal D • Is there an open or short circuit? | Yes | Repair or replace for open or short circuit.
No | Go to the next step.
15 | INSPECT IF MALFUNCTION IS IN HEADLIGHT LEVELING ACTUATOR OR AUTO LEVELING CONTROL MODULE • Replace the front combination lights on the left and right separately with a front combination light in which the actuator operates normally. • Does the auto leveling warning light illuminate after replacing the front combination light on the left or right side? | Yes | Replace the auto leveling control module. (See AUTO LEVELING CONTROL MODULE REMOVAL/INSTALLATION.)
No | Replace the suspected side front combination light. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)