LIGHTING SYSTEM Instrument Panel Illumination Circuit

DESCRIPTION

• When the taillights are turned on by the automatic light control or manual light control, the instrument panel illumination is also turned on.

• When the taillights are turned on by the daytime running light control, the instrument panel illumination on is prohibited.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

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

   5. According to the display on the intelligent tester, perform the Active Test.

      Main Body

      Tester Display	Test Part	Control Range	Diagnostic Note
      Interior Panel Relay	PANEL relay (Instrument panel junction block assembly)	OFF or ON	Light control switch in TAIL position.

      OK
      Relay operates when operating it using the Active Test (each light comes on or off).

   
   

   OK

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

   NG

2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - MAIN BODY ECU)

   
   

   1. Disconnect the 3A instrument panel junction block assembly connector.

   2. Disconnect the F76 main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 3A-36 - F76-15 (PANL) Always Below 1 Ω 3A-36 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. REPLACE MAIN BODY ECU

   
   

   1. Temporarily replace the main body ECU with a new functioning one Click here.

   
   

   NEXT

4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the intelligent tester on.

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

   5. According to the display on the intelligent tester, perform the Active Test.

      Main Body

      Tester Display	Test Part	Control Range	Diagnostic Note
      Interior Panel Relay	PANEL relay (Instrument panel junction block assembly)	OFF or ON	Light control switch in TAIL position.

      OK
      Relay operates when operating it using the Active Test (each light comes on or off).

   
   

   OK

   END (MAIN BODY ECU DEFECTIVE)

   NG

   REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY