LANE-KEEPING ASSIST SYSTEM Headlight Dimmer Switch Circuit

DESCRIPTION

When the driving support ECU receives a turn signal light switch signal, the driving support ECU cancels the lane-keeping assist system.

WIRING DIAGRAM

*1	WNKL
*2	WNKR
*3	Headlight Dimmer Switch Assembly
*4	Driving Support ECU

PROCEDURE

1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

   
   

   1. 

      Remove the headlight dimmer switch Click here.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition 15 (TL) - 12 (E) Turn signal switch left turn Below 1 Ω Turn signal switch right turn 10 kΩ or higher 13 (TR) - 12 (E) Turn signal switch right turn Below 1 Ω Turn signal switch left turn 10 kΩ or higher

   
   

   NG

   REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

   OK

2. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - DRIVING SUPPORT ECU AND BODY GROUND)

   
   
   1. 

      Text in Illustration

      *1	Front view of wire harness connector (to Headlight Dimmer Switch Assembly)
      *2	Front view of wire harness connector (to Driving Support ECU)

      Disconnect the D7 switch connector.

   2. Disconnect the D14 ECU connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition D7-15 (TL) - D14-35 (WNKL) Always Below 1 Ω D7-13 (TR) - D14-34 (WNKR) D7-12 (E) - Body ground D7-15 (TL) - Body ground Always 10 kΩ or higher D7-13 (TR) - Body ground

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR