Auto leveling system
Precautions Parts location System information Troubleshooting Circuit diagnosis Removal / installation
LIGHTING (EXTERIOR)
AUTO LEVELING SYSTEM
PRECAUTIONS
1. Precautions during headlight beam adjustment
(1) If using a cover when the headlights are on, do not perform for 3 minutes or more.
(2) Because the headlight outer lens is made of plastic, performing the adjustment for a long time will cause heat that may cause disfiguration.
2. Precautions when handling models with head light auto leveling
(1) The initialization procedure is necessary when removing, installing, or replacing the height control sensor RR LH, when performing a procedure that changes the height of the vehicle, such as replacing the suspension, and when replacing the headlight leveling computer ASSY.
NOTE:
Refer to 
for initialization.
for initialization.(2) When repairing or replacing the suspension on a model with headlight auto leveling, be sure to do so after removing the height control sensor RR LH.
FUNCTION INSPECTION
1. Before troubleshooting
(1) Basic inspection
(a) Inspect the battery voltage.
Standard value
: 11 to 14 V (when the engine is stopped)
(2) Inspect for blown fuses, wiring harnesses open circuit, short circuits, and poor contact of connectors, in places where you can inspect visually.
2. Inspection of the headlight auto leveling
(1) In IG ON, with the light control switch in the HEAD position and the vehicle stopped, change the vehicle posture. Maintain that status for 3 seconds or more, and check that the beams move.
CAUTION:
Change the vehicle height slowly.
REGISTRATION SETTINGS
1. Initialization procedure for the headlight leveling computer ASSY
CAUTION:
Perform initialization using the following procedure when removing, installing, or replacing the height control sensor RR LH, when performing a procedure that changes the height of the vehicle, such as replacing the suspension, and when replacing the headlight leveling computer ASSY.
NOTE:
When initializing the headlight leveling computer ASSY, the amount of fuel shown on the scales of the fuel receiver gauge is broken into 5 levels, and processing is performed based on the amount of fuel at that time.
(1) Checking the vehicle condition (*1)
(a) Put the vehicle in the following condition.
·Remove any loadable luggage from the vehicle. (The spare tire and on-board tools are mounted on the vehicle.)
·There are no passengers in the vehicle.
·Turn off the headlights.
·Vehicle is stopped, and the vehicle height does not change. (Vehicle posture is stable on a level surface.)
·There are no passengers in the vehicle.
·Turn off the headlights.
·Vehicle is stopped, and the vehicle height does not change. (Vehicle posture is stable on a level surface.)
NOTE:
Initialization cannot be normally performed unless above-mentioned conditions are all satisfied.
(2) Checking the warning display
(a) 3 seconds after IG OFF → ON, check the warning display of the headlight leveling warning light in the combination meter ASSY.
Criteria
| Operation contents |
Warning display |
|---|---|
| Replacement (new one) or initialization error of the headlight leveling computer ASSY |
Continues blinking 6 times at 2 Hz |
| Replacement or removal / installation of the height control sensor RR LH, or suspension replacement, etc. |
OFF |
NOTE:
If it is outside the specification, check the headlight leveling computer ASSY, the height control sensor RR LH, and the wiring harnesses and connectors.
(3) Initialization operation
(a) Turn the ignition switch to ON.
(b) Using the SST, short-circuit 1 (LVL) to 4 (CG) of DLC3.
SST
09843-18040
(c) Based on the position of the indicator of the fuel receiver gauge (amount of remaining fuel), determine the applicable number of times to operate the light control switch using the following chart.
(d) After short-circuiting the initialization terminals, turn the light control switch OFF → HEAD → OFF for the number N(*2)of times.
NOTE:
·*2: N is the number of times to operate the light control switch determined based on the position of the indicator of the fuel receiver gauge.
·Start operating the switch within 20 seconds after short-circuiting the initialization terminals.
·Operate the switch approx. at 3-second intervals.
·Start operating the switch within 20 seconds after short-circuiting the initialization terminals.
·Operate the switch approx. at 3-second intervals.
(e) After operating the light control switch, check the warning display 3 seconds later.
Result
| Operation contents |
Warning display |
Result |
|---|---|---|
| Replacement of the headlight leveling computer ASSY (new) |
Blinks 6 times at 2 Hz → Continues blinking N(*3) times at 2 Hz |
Initialization completed normally |
| Continues blinking 6 times at 2 Hz |
Initialization error |
|
| Replacement or removal / installation of the height control sensor RR LH, or suspension replacement, etc. |
No blinking → Continues blinking N(*3) times at 2 Hz |
Initialization completed normally |
| Continues blinking 6 times at 2 Hz |
Initialization error |
NOTE:
·*3: N is the number of times the light control switch was operated.
·For initialization errors, the headlight leveling warning light in the combination meter ASSY turns on.
·If the number of times the warning light blinks and the number of times the switch was operated are different, initialization was not completed normally.
·If it was not completed normally (initialization error), start over from (*1).
·For initialization errors, the headlight leveling warning light in the combination meter ASSY turns on.
·If the number of times the warning light blinks and the number of times the switch was operated are different, initialization was not completed normally.
·If it was not completed normally (initialization error), start over from (*1).
(f) Once the normal completion of the initialization is confirmed, turn the ignition switch to OFF.
NOTE:
Blinking from initialization completing normally continues until IG OFF.
PARTS LOCATION
SYMPTOM TABLE
Auto leveling control
| Symptoms |
Inspection items |
Reference pages |
|---|---|---|
| Beam control is not performed. |
Failsafe function |
|
| ECU IG1 fuse |
|
|
| Height control sensor RR LH |
|
|
| Headlight leveling motor circuit |
|
|
| Headlight leveling computer ASSY |
- |
|
| When IG OFF → ON, the headlight auto leveling warning light does not turn on (beam control is normal). |
Headlight leveling computer ASSY |
- |
| Combination meter ASSY |
- |
|
| Vehicle wiring harness and connector |
- |
|
| The headlight auto leveling warning light turns on. |
Failsafe function |
|
| Height control sensor RR LH |
|
|
| Headlight leveling computer ASSY |
- |
|
| Combination meter ASSY |
- |
|
| Vehicle wiring harness and connector |
- |
HOW TO TROUBLESHOOT
1.
Bring in the car
Next▼
2.
Interview and phenomenon check
Next▼
3.
Symptom table
NOTE:
B
>Go to Step 5.
A▼
4.
Based on the trouble phenomenon, perform troubleshooting following the steps below.
(1) Function check (refer to )
)(2) ECM terminal matrix (Refer to )
)(3) Failsafe list (Refer to )
)(4) On-vehicle inspection
(5) Unit inspection
Next▼
5.
Adjustment, repair, or replacement
Next▼
6.
Confirmation test
Next▼
Complete
CHECK LIST FOR INTERVIEW
CIRCUIT FIGURE
ECM TERMINAL ARRANGEMENT
1. Headlight leveling computer ASSY
Standard value
| Inspection terminals (Terminal symbol) |
Measuring conditions |
Standard value |
|---|---|---|
| A16-1 (IG) ←→ A16-9 (SHR) |
IG ON |
11 to 14 V |
| A16-3 (WNG) ←→ A16-9 (SHR) |
Headlights off → on |
5 V or more → 1.5 V or less |
| A16-5 (INIT) ←→ A16-9 (SHR) |
Always (Initialization signal input terminal) |
Approx. 5 V |
| A16-6 (WNG) ←→ A16-9 (SHR) |
After IG ON, 3 seconds (warning light on)→ After 3 seconds (warning light off) |
Less than 1 V → 11 to 14 V |
| A16-9 (SHR) ←→ Chassis ground |
Always |
Less than 1 Ω |
| A16-10 (RH1) ←→ A16-9 (SHR) |
IG ON |
11 to 14 V |
| A16-11 (LH1) ←→ A16-9 (SHR) |
IG ON |
11 to 14 V |
| A16-12 (SBR) ←→ A16-21 (SGR) |
IG ON |
4.75 to 5.25 V |
| A16-16 (SPDR) ←→ A16-9 (SHR) |
Driving at approx. 20 km/h |
Pulse generation (Waveform 1) |
| A16-17 (RH2) ←→ A16-9 (SHR) |
Headlights off → on |
Less than 1 V → 1.0 to 14.4 V (17 seconds) |
| Headlights on with no change in vehicle height → Change the vehicle height and maintain for 3 seconds or more |
||
| A16-18 (LH2) ←→ A16-9 (SHR) |
Headlights off → on, |
Less than 1 V → 1.0 to 14.4 V (17 seconds) |
| Headlights on with no change in vehicle height → Change the vehicle height and maintain for 3 seconds or more |
||
| A16-19 (SHR) ←→ A16-21 (SGR) |
IG ON (No passengers, no luggage, vehicle is stationary) |
Approx. 2.5 V*1 |
| A16-21 (SGR) ←→ A16-9 (SHR) |
Always |
Less than 1 Ω |
| A16-23 (RH3) ←→ A16-9 (SHR) |
Always |
Less than 1 Ω |
| A16-24 (LH3) ←→ A16-9 (SHR) |
Always |
Less than 1 Ω |
*1: Values change depending on the vehicle status.
FAILSAFE LIST
1. Failsafe function
(1) Headlight leveling computer ASSY
(a) If the following errors are detected, the headlight leveling computer ASSY stops auto leveling control. Also, if an error is detected while the actuator is in motion, the actuator operation is stopped.
| Item |
Error detection conditions |
Restoring conditions |
Warning display |
|---|---|---|---|
| [Power Supply Voltage Failure] |
When power supply voltage of 18.5 V or more is detected |
When power supply voltage of 17.5 V or less is detected |
OFF |
| When power supply voltage of 9.0 V or less is detected |
When power supply voltage of 9.3 V or more is detected |
||
| Vehicle height sensor power supply error |
When vehicle height sensor power supply voltage of 6.25 V or more is detected |
When vehicle height sensor power supply voltage less than 6.25 V is detected |
ON |
| When vehicle height sensor power supply voltage of 4.60 V or less is detected |
When vehicle height sensor power supply voltage above 4.6 V is detected |
||
| Vehicle height sensor signal error |
When vehicle height sensor signal voltage of 4.75 V or more is detected |
When vehicle height sensor signal voltage less than 4.75 V is detected |
ON |
| When vehicle height sensor signal voltage of 0.25 V or less is detected |
When vehicle height sensor signal voltage above 0.25 V is detected |
||
| Vehicle height sensor data error during initialization |
When the headlight leveling computer ASSY was initialized with an invalid sensor signal from the vehicle height sensor |
When initialization is performed with a valid sensor value from the vehicle height sensor |
ON |
| Headlight leveling motor circuit |
|---|
Circuit figure
Inspection steps
CAUTION:
After replacing the headlight leveling computer ASSY, initialization is required. (Refer to )
)1.
Inspection of the wiring harnesses and connectors (headlight leveling computer ASSY - headlight ASSY)
(1) Disconnect the connector A16 of the headlight leveling computer ASSY.
(2) Disconnect the connector A62 of the headlight ASSY LH, or connector A40 of the headlight ASSY RH.
(3) Measure the resistance according to the following chart.
Resistance (open circuit check)
LH side
| Inspection terminals (Terminal symbol) |
Inspection conditions |
Standard value |
|---|---|---|
| A16-11 (LH1) - A62-3 (LHB1) |
Always |
Less than 1 Ω |
| A16-18 (LH2) - A62-2 (LHM+) |
Always |
Less than 1 Ω |
| A16-24 (LH3) - A62-1 (LHE) |
Always |
Less than 1 Ω |
RH side
| Inspection terminals (Terminal symbol) |
Inspection conditions |
Standard value |
|---|---|---|
| A16-10 (RH1) - A40-3 (RHB1) |
Always |
Less than 1 Ω |
| A16-17 (RH2) - A40-2 (RHM+) |
Always |
Less than 1 Ω |
| A16-23 (RH3) - A40-1 (RHE) |
Always |
Less than 1 Ω |
Resistance (short circuit check)
LH side
| Inspection terminals (Terminal symbol) |
Inspection conditions |
Standard value |
|---|---|---|
| A16-11 (LH1) - Chassis ground |
Always |
10 kΩ or more |
| A16-18 (LH2) - Chassis ground |
Always |
10 kΩ or more |
| A16-24 (LH3) - Chassis ground |
Always |
10 kΩ or more |
RH side
| Inspection terminals (Terminal symbol) |
Inspection conditions |
Standard value |
|---|---|---|
| A16-10 (RH1) - Chassis ground |
Always |
10 kΩ or more |
| A16-17 (RH2) - Chassis ground |
Always |
10 kΩ or more |
| A16-23 (RH3) - Chassis ground |
Always |
10 kΩ or more |
NG
>Repair or replacement of wiring harness or connector
OK▼
2.
Replacement of the headlight leveling computer ASSY
(1) Replace with a new or normal headlight leveling computer ASSY. (Refer to )
)Next▼
3.
Operation inspection
(1) Inspect the operation of the headlight leveling motors. (Refer to )
)
Criteria
: The headlight leveling motors operate normally.
B
>Replacement of the headlight ASSY RH (Refer to )
)C
>Replacement of the headlight ASSY LH (Refer to )
)A▼
Complete (Faulty headlight leveling computer ASSY)