LIGHTING SYSTEM Interior Light Auto Cut Circuit

DESCRIPTION

When the battery saving control operates, the main body ECU (multiplex network body ECU) controls the operation of the DOME CUT relay that is built into the instrument panel junction block assembly to turn off the interior lights.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS (RELAY FOR INTERIOR LIGHT AUTO CUT FUNCTION)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine 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
      Relay for Interior Light Auto Cut Function	DOME CUT relay	ON or OFF	-

      
      Body Electrical > Main Body > Active Test

      Tester Display
      Relay for Interior Light Auto Cut Function

      OK
      DOME CUT relay operates.

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

2. CHECK HARNESS AND CONNECTOR (POWER SOURCE - COWL SIDE JUNCTION BLOCK LH)

   
   
   1. 

      *a	Front view of wire harness connector (to Cowl Side Junction Block LH)

      Disconnect the cowl side junction block LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition 5D-2 - Body ground Always 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT COWL SIDE JUNCTION BLOCK LH

   
   

   1. Remove the cowl side junction block LH.

      Click here

   2. Remove the main body ECU (multiplex network body ECU) from the cowl side junction block LH.

      Click here

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

      

      *a

      Component without harness connected (Cowl Side Junction Block LH)

      -

      -

      Standard Voltage

      Tester Connection Condition Specified Condition 5C-39 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V 5A-4 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V 5A-30 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V 5C-42 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V 5C-38 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V 5A-22 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V 5A-9 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V 5A-8 - Battery negative terminal Battery positive (+) → 5D-2 Battery negative (-) → 5B-16 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE COWL SIDE JUNCTION BLOCK LH Click here

   OK

4. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

   
   

   1. Disconnect the 5B cowl side junction block LH connector.

   2. Disconnect the K10 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition K10-2 (DOMR) - 5B-16 Always Below 1 Ω K10-2 (DOMR) or 5B-16 - 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