AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM Vehicle Speed Signal Circuit
| DTC Code | DTC Name |
|---|---|
| Vehicle Speed Signal Circuit |
DESCRIPTION
The headlight leveling ECU receives the vehicle speed signal from the combination meter.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
READ VALUE USING GTS (VEHICLE SPEED)
Using the GTS, read the Data List.
Body Electrical > HL AutoLeveling > Data List
Tester Display
Measurement Item
Range
Normal Condition
Diagnostic Note
Vehicle Speed
Vehicle speed
0 to 327.67 km/h
Actual vehicle speed
-
Body Electrical > HL AutoLeveling > Data List
Tester Display
Vehicle Speed
OK
The display is as specified in the normal condition column.
Result
Proceed to
OK
NG
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)
Disconnect the G16 combination meter connector.
Disconnect the A67 headlight leveling ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
G16-6 (+S) - A67-16 (SPDR)
Always
Below 1 Ω
G16-6 (+S) - Body ground
Always
10 kΩ or higher
Result
Proceed to
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK COMBINATION METER ASSEMBLY
-
*a
Component with harness connected
(Combination Meter Assembly)
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)
G16-6 (+S) - Body ground
Tool setting
5 V/DIV., 20 ms./DIV.
Condition
Vehicle is driven at approximately 20 km/h (12 mph)
Result
Proceed to
Waveform is as shown in the illustration
Waveform is not as shown in the illustration
Tip: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
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