Height Control Sensor Circuit: Procedure

1. Connect the 3 dry cell batteries (1.5 V) in series.
   Fig 1: Inspecting Height Control Sensor (Front LH)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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

   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: Go to next step 

1. Connect the 3 dry cell batteries (1.5 V) in series.
   Fig 2: Inspecting Height Control Sensor (Rear LH)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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

   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: Go to next step 

1. Check the wire harness between the headlight beam level control ECU and height control sensor (front LH).
   Fig 3: Identifying A43 ECU Connector And A20 Or Q4 Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect A43 ECU connector.
   2. Disconnect A20 or q4 sensor connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      2GR-FSE 

      1UR-FSE 

      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

      Tester Connection	Specified Condition
      A43-16 (SGF) - q4-1 (SHG)	Below 1 Ω
      A43-18 (SHFL) - q4-2 (SHFL)	Below 1 Ω
      A43-20 (SBF) - q4-3 (SHB)	Below 1 Ω
      A43-16 (SGF) or q4-1 (SHG) - Body ground	10 kΩ or higher
      A43-18 (SHFL) or q4-2 (SHFL) - Body ground	10 kΩ or higher
      A43-20 (SBF) or q4-3 (SHB) - Body ground	10 kΩ or higher

2. Check the wire harness between the headlight beam level control ECU and height control sensor (rear LH).
   Fig 4: Identifying A43 ECU Connector And O2 Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect A43 ECU connector.
   2. Disconnect o2 sensor connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance

      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

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

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