Lighting System Height Control Sensor Circuit

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Lighting. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT HEIGHT CONTROL SENSOR (FRONT LH)

INSPECT HEIGHT CONTROL SENSOR (REAR LH)

CHECK WIRE HARNESS (AFS ECU - HEIGHT CONTROL SENSOR (FRONT LH OR REAR LH))

LIGHTING SYSTEM - Height Control Sensor Circuit


DESCRIPTION

This circuit provides power to operate the height control sensor. The headlight beam level control ECU calculates a height value from the height control sensor signal and the voltage at the power source of the height control sensor. The voltage at the power source of the height control sensor is corrected when SHFL or SHFL is detected.

Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Height Control Sensor Circuit


WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Height Control Sensor Circuit


INSPECTION PROCEDURE

1.INSPECT HEIGHT CONTROL SENSOR (FRONT LH)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Height Control Sensor Circuit

  1. Connect the 3 dry cell batteries (1.5 V) in series.

  1. Remove the height control sensor front LH.

  1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead from the battery to terminal 3.

  1. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    2 (SHFL) - 1 (SHG)
    		+45° (High)
    		Approx 4.5 V
    2 (SHFL) - 1 (SHG)
    		0° (Normal)
    		Approx 2.5 V
    2 (SHFL) - 1 (SHG)
    		-45° (Low)
    		Approx 0.5 V


NG
REPLACE HEIGHT CONTROL SENSOR (FRONT LH)
OK


2.INSPECT HEIGHT CONTROL SENSOR (REAR LH)


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Height Control Sensor Circuit

  1. Connect the 3 dry cell batteries (1.5 V) in series.

  1. Remove the height control sensor rear LH.

  1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead from the battery to terminal 3.

  1. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    2 (SHRL) - 1 (SHG)
    		+45° (High)
    		Approx 4.5 V
    2 (SHRL) - 1 (SHG)
    		0° (Normal)
    		Approx 2.5 V
    2 (SHRL) - 1 (SHG)
    		-45° (Low)
    		Approx 0.5 V


NG
REPLACE HEIGHT CONTROL SENSOR (REAR LH)
OK


3.CHECK WIRE HARNESS (AFS ECU - HEIGHT CONTROL SENSOR (FRONT LH OR REAR LH))


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Height Control Sensor Circuit

  1. Check the wire harness between the headlight beam level control ECU and height control sensor (front LH).

    1. Disconnect A30 ECU connector.

    2. Disconnect A21 sensor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Specified Condition
      A30-17 (SGF) - A21-1 (SHG)
      		Below 1 Ω
      A30-2 (SHFL) - A21-2 (SHFL)
      		Below 1 Ω
      A30-1 (SBF) - A21-3 (SHB)
      		Below 1 Ω
      A30-17 (SGF) or A21-1 (SHG) - Body ground
      		10 kΩ or higher
      A30-2 (SHFL) or A21-2 (SHFL) - Body ground
      		10 kΩ or higher
      A30-1 (SBF) or A21-3 (SHB) - Body ground
      		10 kΩ or higher


    Lexus Gs430, Gs300. Uzs190 Grs190.Lighting.Lighting System.Lighting System Height Control Sensor Circuit

  1. Check the wire harness between the headlight beam level control ECU and height control sensor (rear LH).

    1. Disconnect A31 ECU connector.

    2. Disconnect o2 sensor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance:
      Tester Connection
      		Specified Condition
      A31-20 (SGR) - o2-1 (SHG)
      		Below 1 Ω
      A31-9 (SHRL) - o2-2 (SHRL)
      		Below 1 Ω
      A31-10 (SBR) - o2-3 (SHB)
      		Below 1 Ω
      A31-20 (SGR) or o2-1 (SHG) - Body ground
      		10 kΩ or higher
      A31-9 (SHRL) or o2-2 (SHRL) - Body ground
      		10 kΩ or higher
      A31-10 (SBR) or o2-3 (SHB) - Body ground
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE