Lighting System Vehicle Speed Signal Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

CHECK COMBINATION METER ASSEMBLY

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADLIGHT LEVELING ECU ASSEMBLY)

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

After replacing the headlight leveling ECU, initialization of the ECU is necessary (Toyota Fortuner RM000002CE402CX.html).

1. Using the intelligent tester, read the Data List (Toyota Fortuner RM000000PKV08JX.html).
   
   

   HL 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.
   

1. Remove the combination meter with its connector still connected (Toyota Fortuner RM000000THS01WX.html).
   

2. Connect an oscilloscope to the combination meter connector.
   

3. Check the waveform.
   

   Measurement Condition

   Item	Content
   Terminal No. (Symbol)	C27-6 - 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)

   HINT:

   As the vehicle speed increases, the wavelength shortens.

1. Disconnect the C27 combination meter connector.
   

2. Disconnect the H17 headlight leveling ECU connector.
   

3. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   C27-6 - H17-16 (SPDR)	Always	Below 1 Ω
   C27-6 - Body ground	Always	10 kΩ or higher