Inspection Procedure

1. Connect the 3 dry cell batteries (1.5 V) in series.
2. Remove the height control sensor front LH.
3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   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

Fig 1: Inspecting Height Control Sensor (Front LH)

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NG: REPLACE HEIGHT CONTROL SENSOR (FRONT LH) 

OK: Go to next step 

1. Connect the 3 dry cell batteries (1.5 V) in series.
2. Remove the height control sensor rear LH.
3. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead from the battery to terminal 1.
4. Measure the voltage between terminals 2 and 1 while slowly moving the link up and down.

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   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

Fig 2: Inspecting Height Control Sensor (Rear LH)

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NG: REPLACE HEIGHT CONTROL SENSOR (REAR LH) 

OK: Go to next step 

1. Check the wire harness between the headlight beam level control ECU and height control sensor (front LH).
   1. Disconnect A43 ECU connector.
   2. Disconnect A20 sensor connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      A43-16 (SGF) - A20-1 (SHG)	Below 1 Ω
      A43-18 (SHFL) - A20-2 (SHFL)	Below 1 Ω
      A43-20 (SBF) - A20-3 (SHB)	Below 1 Ω
      A43-16 (SGF) or A20-1 (SHG) - Body ground	10 kΩ or higher
      A43-18 (SHFL) or A20-2 (SHFL) - Body ground	10 kΩ or higher
      A43-20 (SBF) or A20-3 (SHB) - Body ground	10 kΩ or higher

   Fig 3: Identifying A43 ECU Connector And A20 Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the wire harness between the headlight beam level control ECU and height control sensor (rear LH).
   1. Disconnect A43 ECU connector.
   2. Disconnect o2 sensor connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      A43-17 (SGR) - o2-1 (SHG)	Below 1 Ω
      A43-19 (SHRL) - o2-2 (SHRL)	Below 1 Ω
      A43-21 (SBR) - o2-3 (SHB)	Below 1 Ω
      A43-17 (SGR) or o2-1 (SHG) - Body ground	10 kΩ or higher
      A43-19 (SHRL) or o2-2 (SHRL) - Body ground	10 kΩ or higher
      A43-21 (SBR) or o2-3 (SHB) - Body ground	10 kΩ or higher

Fig 4: Identifying A43 ECU Connector And O2 Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE