Headlight Beam Level Control Actuator Circuit
The headlight leveling ECU assembly actuates the headlight leveling motor according to vehicle conditions.
WIRING DIAGRAM
PROCEDURE
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 LevelingTester Display | Test Part | Control Range | Diagnostic Note |
|---|---|---|---|
Drive The Leveling Motor |
Leveling motor |
UP/OFF |
- |
DOWN/OFF |
- |
OK:
Headlight leveling motors operate normally.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
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 SideTester 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 |
|
REPLACE HEADLIGHT LEVELING MOTOR (HEADLIGHT UNIT)
(a) Temporarily replace the headlight leveling motor with a new or normally functioning one (See page .gif)
).
(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 |
Test yourself
A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.