Lighting System - Headlight Beam Level Control Actuator Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT LEVELING MOTOR)
CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)
INSPECT HEADLIGHT UNIT ASSEMBLY
CHECK HEADLIGHT LEVELING MOTOR
LIGHTING SYSTEM - Headlight Beam Level Control Actuator Circuit
DESCRIPTION
The headlight leveling ECU actuates the headlight leveling motors according to the vehicle conditions.
WIRING DIAGRAM
INSPECTION PROCEDURE
- After replacing the headlight leveling ECU, initialization of the ECU is necessary ().
| 1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT LEVELING MOTOR) |
Using the intelligent tester, perform the Active Test ().
HL Auto Leveling| Tester Display | Test Part | Control Range | Diagnostic Note |
| Drive The Leveling Motor UP* | Headlight leveling motor upward operation | ON/OFF | ON: Move up
OFF: Stop |
| Drive The Leveling Motor DOWN* | Headlight leveling motor downward operation | ON/OFF | ON: Move down
OFF: Stop |
*: Perform the Active Test with the engine running and vehicle stopped.
- OK:
- Headlight leveling motors operate normally.
| OK | |
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| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 2.CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY) |
Disconnect the E109 headlight leveling ECU connector.
Disconnect the A54*1 or A58*2 headlight leveling motor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LH| Tester Connection | Condition | Specified Condition |
| E109-11 (LH+) - A54-8 (LHIG) | Always | Below 1 Ω |
| E109-18 (LHT) - A54-3 (LH T) | Always | Below 1 Ω |
| E109-24 (LH-) - A54-4 (LH E) | Always | Below 1 Ω |
| E109-11 (LH+) - Body ground | Always | 10 kΩ or higher |
| E109-18 (LHT) - Body ground | Always | 10 kΩ or higher |
| E109-24 (LH-) - Body ground | Always | 10 kΩ or higher |
for RH| Tester Connection | Condition | Specified Condition |
| E109-10 (RH+) - A58-8 (RHIG) | Always | Below 1 Ω |
| E109-17 (RHT) - A58-3 (RH T) | Always | Below 1 Ω |
| E109-23 (RH-) - A58-4 (RH E) | Always | Below 1 Ω |
| E109-10 (RH+) - Body ground | Always | 10 kΩ or higher |
| E109-17 (RHT) - Body ground | Always | 10 kΩ or higher |
| E109-23 (RH-) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 3.INSPECT HEADLIGHT UNIT ASSEMBLY |
Remove the headlight unit ().
Text in Illustration| *a | Component without harness connected
(Headlight Unit Assembly LH) | *b | Component without harness connected
(Headlight Unit Assembly RH) |
| *c | Front view of wire harness connector
(to Headlight Leveling Motor LH) | *d | Front view of wire harness connector
(to Headlight Leveling Motor RH) |
Disconnect the headlight leveling motor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
- for LH:
| Tester Connection | Condition | Specified Condition |
| 8 (LHIG) - 3 | Always | Below 1 Ω |
| 3 (LH T) - 2 |
| 4 (LH E) - 1 |
- for RH:
| Tester Connection | Condition | Specified Condition |
| 8 (RHIG) - 3 | Always | Below 1 Ω |
| 3 (RH T) - 2 |
| 4 (RH E) - 1 |
| | REPLACE HEADLIGHT UNIT ASSEMBLY ()
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| 4.CHECK HEADLIGHT LEVELING MOTOR |
Temporarily replace the headlight leveling motor with a new or normally functioning one ().
Perform the Active Test of the leveling motors ().
- OK:
- Headlight leveling motors operate normally.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPLACE HEADLIGHT LEVELING ECU ASSEMBLY ()
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| | REPLACE HEADLIGHT LEVELING ECU ASSEMBLY ()
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| A | |
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| END (HEADLIGHT LEVELING MOTOR WAS DEFECTIVE) |
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