Headlight Beam Level Control Actuator Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (READY).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL Auto Leveling / Active Test.
5. Check that the leveling motors operate.
   HL AUTO LEVELING
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Drive The Leveling Motor UP	Leveling motor upward operation	ON/OFF	ON: Move up OFF: Stop
   Drive The Leveling Motor DOWN	Leveling motor downward operation	ON/OFF	ON: Move down OFF: Stop

   OK

   Headlight leveling motors operate normally.

NG → See step   2 

OK → See step   4 

1. Disconnect the A48 headlight leveling ECU assembly connector.
2. Disconnect the A14 or A49 headlight leveling motor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   LH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A48-18 (LHT) - A14-2 (LHT)	Always	Below 1 Ω
   A48-11 (LH+) - A14-3 (LHIG)	Always	Below 1 Ω
   A48-24 (LH-) - A14-1 (LHE)	Always	Below 1 Ω
   A48-18 (LHT) - Body ground	Always	10 kΩ or higher
   A48-11 (LH+) - Body ground	Always	10 kΩ or higher
   A48-24 (LH-) - Body ground	Always	10 kΩ or higher

   RH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A48-17 (RHT) - A49-2 (RHT)	Always	Below 1 Ω
   A48-10 (RH+) - A49-3 (RHIG)	Always	Below 1 Ω
   A48-23 (RH-) - A49-1 (RHE)	Always	Below 1 Ω
   A48-17 (RHT) - Body ground	Always	10 kΩ or higher
   A48-10 (RH+) - Body ground	Always	10 kΩ or higher
   A48-23 (RH-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the headlight leveling motor with a new or normally functioning one. Refer to COMPONENTS .
2. Perform the Active Test of the leveling motors.

   OK

   Headlight leveling motors operate normally.

NG → See step   5 

OK → END