LIGHTING SYSTEM High Beam Headlight Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the high beam headlights.

WIRING DIAGRAM

1. for Halogen Headlight

   

2. for LED Headlight

   

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Main Body / Active Test.

   5. Perform the Active Test according to the display on the GTS.

      Main Body

      Tester Display	Test Part	Control Range	Diagnostic Note
      Head Light Hi	High beam headlights	OFF or ON	-

      OK
      High beam headlights illuminate.

   
   

   OK

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

   NG

2. INSPECT DIM RELAY

   
   

   1. Inspect the DIM relay.

      Click here

   
   

   NG

   REPLACE DIM RELAY

   OK

3. CHECK HARNESS AND CONNECTOR (POWER SOURCE - DIM RELAY)

   
   

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

      Standard Voltage
      Tester Connection Condition Specified Condition 2 (DIM relay) - Body ground Power switch off 11 to 14 V 3 (DIM relay) - Body ground Power switch off 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

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

   
   

   1. Disconnect the A10*1 or A73*2 headlight assembly LH connector.

   2. Disconnect the A41*1 or A75*2 headlight assembly RH connector.

      
      

      • *1: for Halogen Headlight

      • *2: for LED Headlight

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

      Standard Resistance
      for Halogen Headlight Tester Connection Condition Specified Condition 5 (DIM relay) - A10-3 (HI) Always Below 1 Ω 5 (DIM relay) - A41-3 (HI) Always Below 1 Ω 5 (DIM relay) or A10-3 (HI) - Body ground Always 10 kΩ or higher 5 (DIM relay) or A41-3 (HI) - Body ground Always 10 kΩ or higher
      for LED Headlight Tester Connection Condition Specified Condition 5 (DIM relay) - A73-2 (SOL) Always Below 1 Ω 5 (DIM relay) - A75-2 (SOL) Always Below 1 Ω 5 (DIM relay) or A73-2 (SOL) - Body ground Always 10 kΩ or higher 5 (DIM relay) or A75-2 (SOL) - 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. Disconnect the 2C instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 (DIM relay) - 2C-22 Always Below 1 Ω 1 (DIM relay) or 2C-22 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   

   *a

   Component without harness connected (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.

      Standard Resistance
      Tester Connection Condition Specified Condition 2C-22 - A-22 (DIM) Always Below 1 Ω

   
   

   OK

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

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here