DESCRIPTION
The headlight leveling ECU assembly actuates the headlight leveling motor according to vehicle conditions.
WIRING DIAGRAM
PROCEDURE
1. |
READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / HL Auto Leveling / Active Test.
(e) Check that the motors operate.
HL Auto Leveling
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Drive The Leveling Motor |
Leveling motor |
UP/OFF |
- |
DOWN/OFF |
- |
OK:
Headlight leveling motors operate normally.
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING MOTOR - HEADLIGHT LEVELING ECU ASSEMBLY) |
(a) Disconnect the A40 headlight leveling ECU connector.
(b) Disconnect the A17 or A16 headlight leveling motor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
LH Side
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A40-18 (LHT) - A17-2 (LH T) |
Always |
Below 1 Ω |
A40-11 (LH+) - A17-3 (LHM+) |
Always |
Below 1 Ω |
A40-24 (LH-) - A17-1 (LHM-) |
Always |
Below 1 Ω |
A40-18 (LHT) - Body ground |
Always |
10 kΩ or higher |
A40-11 (LH+) - Body ground |
Always |
10 kΩ or higher |
A40-24 (LH-) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A40-17 (RHT) - A16-2 (RH T) |
Always |
Below 1 Ω |
A40-10 (RH+) - A16-3 (RHM+) |
Always |
Below 1 Ω |
A40-23 (RH-) - A16-1 (RHM-) |
Always |
Below 1 Ω |
A40-17 (RHT) - Body ground |
Always |
10 kΩ or higher |
A40-10 (RH+) - Body ground |
Always |
10 kΩ or higher |
A40-23 (RH-) - Body ground |
Always |
10 kΩ or higher |
*1 |
Front view of wire harness connector (to Headlight Leveling Motor (Headlight Unit)) |
*3 |
LH Side |
*2 |
Front view of wire harness connector (to Headlight Leveling ECU Assembly) |
*4 |
RH Side |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
REPLACE HEADLIGHT LEVELING MOTOR (HEADLIGHT UNIT) |
(a) Temporarily replace the headlight leveling motor with a new or normally functioning
one (See page ).
(b) Perform the Active Test of the leveling motors.
OK:
Headlight leveling motors operate normally.
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
NG | ![]() |
REPLACE HEADLIGHT LEVELING ECU ASSEMBLY |
System Diagram
SYSTEM DIAGRAM
Communication Table
Transmitting ECU (Transmitter)
Receiving ECU (Receiver)
Signal
Communication Method
Certification ECU (smart key ECU assembly)
Power management contro ...
Components
COMPONENTS
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
...
System Description
SYSTEM DESCRIPTION
1. PUSH-BUTTON START DESCRIPTION
(a) The push-button start uses a push-type engine switch, which the driver can
operate by merely carrying the electrical key. This system consists primarily of
the power management control ECU, engine s ...