LIGHTING SYSTEM(w/o Automatic Headlight Beam Level Control System) Headlight Dimmer Switch Circuit

DESCRIPTION

The steering sensor receives the following switch information:

• Light control switch in tail, head or AUTO position

• Dimmer switch in high, low or high flash (pass) position

• Fog light switch in front*, rear or off position




• *: w/ Front Fog Light

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. READ VALUE USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Chassis / Steering Angle Sensor / Data List.

   5. Read the Data List according to the display on the GTS.

      
      Chassis > Steering Angle Sensor > Data List

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Light OFF Switch	Light control switch off position signal	OFF or ON	OFF: Light control switch not in off position ON: Light control switch in off position	-
      Auto Light Switch	Light control switch AUTO position signal	OFF or ON	OFF: Light control switch not in AUTO position ON: Light control switch in AUTO position	-
      Head Light Switch (Tail)	Light control switch tail position signal	OFF or ON	OFF: Light control switch in neither tail nor head position ON: Light control switch in tail or head position	-
      Head Light Switch (Head)	Light control switch head position signal	OFF or ON	OFF: Light control switch not in head position ON: Light control switch in head position	-
      High Beam Main Switch	Dimmer switch high position signal	OFF or ON	OFF: Dimmer switch not in high position ON: Dimmer switch in high position	-
      Passing Light Switch	Dimmer switch high flash position (pass) signal	OFF or ON	OFF: Dimmer switch not in high flash position ON: Dimmer switch in high flash position	-
      Front Fog Light Switch	Front fog light switch signal	OFF or ON	OFF: Front fog light switch off ON: Front fog light switch on	w/ Front Fog Light
      Rear Fog Light/Bad Weather Switch	Rear fog light switch signal	OFF or ON	OFF: Rear fog light switch off ON: Rear fog light switch on	-

      
      Chassis > Steering Angle Sensor > Data List

      Tester Display
      Light OFF Switch
      Auto Light Switch
      Head Light Switch (Tail)
      Head Light Switch (Head)
      High Beam Main Switch
      Passing Light Switch
      Front Fog Light Switch
      Rear Fog Light/Bad Weather Switch

      OK
      Normal conditions listed above are displayed.

      Result
      Proceed to OK NG

   
   

   NG

   INSPECT TURN SIGNAL SWITCH Click here

   OK

2. READ VALUE USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Main Body / Data List.

   5. Read the Data List according to the display on the GTS.

      
      Body Electrical > Main Body > Data List

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Head Light SW (Head)	Light control switch head position signal	OFF or ON	OFF: Light control switch not in head position ON: Light control switch in head position	-

      
      Body Electrical > Main Body > Data List

      Tester Display
      Head Light SW (Head)

      OK
      Normal conditions listed above are displayed.

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

3. INSPECT STEERING SENSOR

   

   *a

   Component without harness connected (Steering Sensor)

   -

   -

   
   

   1. Remove the steering sensor.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition K71-7 (HEAD) - z6-4 (H) Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE STEERING SENSOR Click here

   OK

4. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

   
   

   1. Disconnect the K52 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition K71-7 (HEAD) - K52-16 (HEAD) Always Below 1 Ω K71-7 (HEAD) or K52-16 (HEAD) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

5. INSPECT TURN SIGNAL SWITCH

   
   

   1. Remove the turn signal switch.

      Click here

   2. Inspect the turn signal switch.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE TURN SIGNAL SWITCH Click here

   OK

6. INSPECT STEERING WHEEL SWITCH HOUSING

   
   

   1. Remove the steering wheel switch housing.

      Click here

   2. Inspect the steering wheel switch housing.

      Click here

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE STEERING SENSOR Click here

   NG

   REPLACE STEERING WHEEL SWITCH HOUSING Click here