LIGHTING SYSTEM Headlight Solenoid Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives headlight dimmer switch assembly information signals, and operates the solenoid.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEAD LIGHT HI)

   
   

   1. Using the intelligent tester, perform the Active Test Click here.

      Main Body

      Tester Display	Test Part	Control Range	Diagnostic Note
      Head Light Hi	Headlight dimmer relay	ON/OFF	-

      OK
      Relay operates (high beam headlights illuminate).

      Result
      Result Proceed to NG A OK B

   
   

   B

   REPLACE MAIN BODY ECU Click here

   A

2. INSPECT HEADLIGHT DIMMER RELAY (DIM)

   
   

   1. Remove the headlight dimmer relay (DIM) from the No. 2 engine room relay block.

   2. Inspect the DIM relay Click here.

   
   

   NG

   REPLACE DIM RELAY (DIM)

   OK

3. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY - HEADLIGHT DIMMER RELAY)

   
   

   1. Remove the headlight dimmer relay (DIM) from the No. 2 engine room relay block.

   2. 

      Text in Illustration

      *1	No. 2 Engine Room Relay Block
      *a	DIM Relay Terminal

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

      Standard Voltage
      Tester Connection Condition Specified Condition Relay terminal 2 - Body ground Headlights (low beam) on 11 to 14 V Relay terminal 3 - Body ground Headlights (low beam) on 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. CHECK HARNESS AND CONNECTOR (DIM RELAY - HEADLIGHT ASSEMBLY LH AND RH)

   
   

   1. Remove the DIM relay from the No. 2 engine room relay block.

   2. Disconnect the A74 headlight assembly RH connector.

   3. Disconnect the A75 headlight assembly LH connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition Relay terminal 5 - A74-2 (B) Always Below 1 Ω Relay terminal 5 - A75-2 (B) Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition Relay terminal 5 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. CHECK HARNESS AND CONNECTOR (DIM RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

   
   

   1. Remove the DIM relay from the No. 2 engine room relay block.

   2. Disconnect the 3C instrument panel junction block assembly connector.

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

      

      Text in Illustration

      *1	No. 2 Engine Room Relay Block	-	-
      *a	DIM Relay Terminal	*b	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition Relay terminal 1 - 3C-35 Always Below 1 Ω

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition 3C-35 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   

   1. Remove the instrument panel junction block assembly Click here.

   2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      

      Text in Illustration

      *a

      Component without harness connected (Instrument Panel Junction Block Assembly)

      -

      -

      Standard Resistance
      Tester Connection Condition Specified Condition 3C-35 - MB-22 (DIM) Always Below 1 Ω

   
   

   OK

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

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here