Inspection Procedure

1. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION - SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   H12-13 (RH1) - H12-22 (RH3)	Power switch ON (IG)	10 to 14 V
   H12-14 (LH1) - H12-23 (LH3)
   H12-3 (RH2) - H12-22 (RH3)	With power switch ON (IG) and headlight on, change the vehicle height and maintain the height for more than 2 seconds	10 to 12.6 V (Approx. 10 seconds)
   H12-4 (LH2) - H12-23 (LH3)

   Fig 1: Identifying H12 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK : GO TO NEXT STEP 

1. Disconnect the H2*1 or H1*1 actuator connector.

   HINT:

   *1: for LH side

   *2: for RH side

2. Disconnect the H12 ECU connector.
Fig 2: Checking Wire Harness (ECU - Actuator)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance of the wire harness side connector.

   Standard resistance: 

   for LH side 

   TESTER CONNECTION - SPECIFIED CONDITION (LH SIDE)
   
   

   Tester Connection	Specified Condition
   H12-4 (LH2) - H2-2 (LH1)	Below 1Ω
   H12-14 (LH1) - H2-3 (LH3)
   H12-23 (LH3) - H2-1 (LH4)
   H12-4 (LH2) - Body ground	10 kΩ or higher
   H12-14 (LH1) - Body ground
   H12-23 (LH3) - Body ground

   for RH side 

   TESTER CONNECTION - SPECIFIED CONDITION (RH SIDE)
   
   

   Tester Connection	Specified Condition
   H12-3 (RH2) - H1-2 (RH1)	Below 1Ω
   H12-13 (RH1) - H1-3 (RH3)
   H12-22 (RH3) - H1-1 (RH4)
   H12-3 (RH2) - Body ground	10 kΩ or higher
   H12-13 (RH1) - Body ground
   H12-22 (RH3) - Body ground

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : REPLACE HEADLIGHT UNIT (HEADLIGHT BEAM LEVEL CONTROL ACTUATOR)