DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)
CHECK COMBINATION METER ASSEMBLY
LIGHTING SYSTEM - Vehicle Speed Signal Circuit
DESCRIPTION
The headlight leveling ECU receives the vehicle speed signal from the combination meter.
WIRING DIAGRAM
INSPECTION PROCEDURE
- After replacing the headlight leveling ECU, initialization of the ECU is necessary ().
| 1.READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED) |
Using the intelligent tester, read the Data List ().
HL Auto Leveling (w/ Static Headlight Auto Leveling)| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Vehicle Speed | Vehicle speed / 0 to 327.67 km/h | Actual vehicle speed | - |
- OK:
- The display is as specified in the normal condition column.
| OK | |
| |
| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 2.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY) |
Disconnect the E7 combination meter connector.
Disconnect the E109 headlight leveling ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E7-4 (+S) - E109-16 (SPDR) | Always | Below 1 Ω |
| E7-4 (+S) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 3.CHECK COMBINATION METER ASSEMBLY |
w/ Multi-information Display:
Remove the combination meter with its connector still connected ().
w/o Multi-information Display:
Remove the combination meter with its connector still connected ().
Connect an oscilloscope to the combination meter connector.
Check the waveform.
Measurement Condition| Item | Content |
| Terminal No. (Symbol) | E7-4 (+S) - Body ground |
| Tool setting | 5 V/DIV., 20 ms./DIV. |
| Condition | Vehicle is driven at approximately 20 km/h (12 mph) |
- OK:
- Waveform is as shown in the illustration.
Text in Illustration| *a | Component with harness connected
(Combination Meter Assembly) |
- When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.
| | GO TO METER / GAUGE SYSTEM ()
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| OK | |
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| REPLACE HEADLIGHT LEVELING ECU ASSEMBLY ()
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