LIGHTING SYSTEM Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK OPERATION (CLEARANCE LIGHTS)

   
   

   1. Check the operation of the clearance lights.

      OK
      The clearance lights operate normally.

      Result
      Proceed to OK NG

   
   

   NG

   GO TO PROBLEM SYMPTOMS TABLE Click here

   OK

2. 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.

      
      Body Electrical > Main Body > Active Test

      Tester Display	Measurement Item	Control Range	Diagnostic Note
      Daytime Running Light	Daytime running lights	ON/OFF	-

      
      Body Electrical > Main Body > Active Test

      Tester Display
      Daytime Running Light

      OK
      The daytime running lights illuminate.

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

3. INSPECT DRL RELAY

   
   

   1. Remove the DRL relay from the engine room relay block and junction block assembly.

   2. 

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

      Standard Resistance
      Tester Connection Condition Specified Condition 3 - 5 Voltage not applied between terminals 1 and 2 10 kΩ or higher 3 - 5 Voltage applied between terminals 1 and 2 Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE DRL RELAY

   OK

4. CHECK HARNESS AND CONNECTOR (POWER SOURCE - DRL RELAY)

   
   

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

      Standard Voltage
      Tester Connection Condition Specified Condition Relay terminal 1 - Body ground Power switch off 11 to 14 V Relay terminal 3 - Body ground Power switch off 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

5. CHECK HARNESS AND CONNECTOR (DRL RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH)

   
   

   1. Disconnect the A70 headlight assembly LH connector.

   2. Disconnect the A73 headlight assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Relay terminal 5 - A70-2 (B) Always Below 1 Ω Relay terminal 5 - A73-2 (B) Always Below 1 Ω Relay terminal 5 - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

6. CHECK HARNESS AND CONNECTOR (DRL RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

   
   

   1. Disconnect the 3A 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 Relay terminal 2 - 3A-53 Always Below 1 Ω Relay terminal 2 - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

   
   

   1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: 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.

      

      *a

      Component without harness connected (Instrument Panel Junction Block Assembly)

      -

      -

      Standard Resistance
      Tester Connection Condition Specified Condition 3A-53 - MB-26 (DRLE) Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here