LIGHTING SYSTEM INITIALIZATION

Note


  • Initialize the AFS ECU or headlight leveling ECU assembly (set the zero point of the height control sensor in the AFS ECU or headlight leveling ECU assembly) after the vehicle height changes due to replacement of the suspension or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly LH.

  • When the AFS ECU or headlight leveling ECU assembly is replaced, the initialization is also necessary.

  • Adjust the headlight aim after initializing the AFS ECU or headlight leveling ECU assembly Click here for ALPHARD, Click here for VELLFIRE).


  • When a malfunction is detected in the automatic headlight beam level control system, the height control sensor signal initialization is impossible. Perform troubleshooting before initialization.


  1. PREPARE VEHICLE FOR INITIALIZATION


    1. Unload the trunk and vehicle, ensuring that the spare tire, tools and jack are in their original positions.

    2. Check that there are no occupants in the vehicle.

    3. Turn off the headlights.

    4. Stop the vehicle on a level surface and keep the vehicle height unchanged.


      NEXT

  2. CHECK INDICATOR LIGHT


    1. Turn the engine switch on (IG), and check the AFS OFF indicator light.

      OK
      Condition Specified Condition
      The AFS ECU or headlight leveling ECU assembly is replaced with a new one. Indicator light continuously blinks 6 times at 2 Hz.
      Replacement of the rear height control sensor sub-assembly LH, removal and reinstallation of the rear height control sensor sub-assembly LH, replacement of the suspension, etc. is performed. Indicator light comes on for approximately 3 seconds, and then goes off (bulb check function).

      Tech Tips

      If the indicator light does not come on when turning the engine switch on (IG), inspect and repair it according to Problem Symptoms Table Click here.


      NG

      GO TO PROBLEM SYMPTOMS TABLE
      OK

  3. INITIALIZATION


    1. A01CCD9E12

      Connect terminals 4 (CG) and 8 (LVL) of the DLC3 using SST.

      SST
      09843-18040
    2. A01CBNPE01

      Turn the low beam headlights on and off using the light control switch within 20 seconds after connecting the terminals.

      Tech Tips

      The number of times the low beam headlights need to be turned on and off is determined by the present fuel level as shown below.

      Fuel Level Number of Times to Turn Low Beam Headlights on and off
      Fuel level is within A range. 1
      Fuel level is within B range. 2
      Fuel level is within C range. 3
      Fuel level is within D range. 4
      Fuel level is within E range. 5

      Note


      • Turn the low beam headlights on and off at approximately 1-second intervals.

      • Be sure to operate the light control switch from outside the vehicle.

    3. Check the indicator light.

      OK
      Condition Specified Condition
      The AFS ECU or headlight leveling ECU assembly is replaced with a new one. Blinks 6 times at 2 Hz → Continuously Blinks N*1 times at 2 Hz.
      Replacement of the rear height control sensor sub-assembly LH, removal and reinstallation of the rear height control sensor sub-assembly LH, replacement of the suspension, etc. is performed. Off → Continuously Blinks N*1 times at 2 Hz.

      Tech Tips


      • *1: The number of times that AFS OFF indicator blinks is determined by the number of times the low beam headlights are turned on and off.

      • If initialization cannot be finished normally, Disconnect SST from the DLC3 and turn the engine switch off. Then, restart from procedure 1.


      NG

      GO TO PROBLEM SYMPTOMS TABLE
      OK
      TURN ENGINE SWITCH OFF (END)