LIGHTING SYSTEM Taillight Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives a light control switch information signal from the headlight dimmer switch, and illuminates the taillights.

WIRING DIAGRAM

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS (TAILLIGHT)

   
   

   1. Operate the GTS according to the steps on the display and select "Active Test" Click here.

      Main Body

      Tester Display	Test Part	Control Range	Diagnostic Note
      Taillight Relay	Taillight	ON or OFF	-

      OK
      Taillight turns on/turns off.

   
   

   OK

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

   NG

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

   
   
   1. 

      Text in Illustration

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

      Disconnect the 2G 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 2G-1 - Body ground Always 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - COWL SIDE JUNCTION BLOCK LH

   
   

   1. Disconnect the 2K cowl side junction block LH connector.

   2. except Double Swing Out Type:

      
      

      1. Disconnect the K4*1 and L3*2 light connectors.

         *1: for LH

         *2: for RH

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

         Standard Resistance
         for LH
         Tester Connection Condition Specified Condition 2K-3 - K4-6 (TL) Always Below 1 Ω K4-3 (E) - Body ground K4-6 (TL) - Body ground Always 10 kΩ or higher
         for RH
         Tester Connection Condition Specified Condition 2K-3 - L3-6 (TL) Always Below 1 Ω L3-3 (E) - Body ground L3-6 (TL) - Body ground Always 10 kΩ or higher

   3. for Double Swing Out Type:

      
      

      1. Disconnect the n1*1 and Y1*2 light connectors.

         *1: for LH

         *2: for RH

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

         Standard Resistance
         for LH
         Tester Connection Condition Specified Condition 2K-3 - n1-5 (TL) Always Below 1 Ω n1-4 (E) - Body ground n1-5 (TL) - Body ground Always 10 kΩ or higher
         for RH
         Tester Connection Condition Specified Condition 2K-3 - Y1-5 (TL) Always Below 1 Ω Y1-6 (E) - Body ground Y1-5 (TL) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

4. INSPECT COWL SIDE JUNCTION BLOCK LH

   
   

   1. for LHD:

      
      

      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.

   2. for RHD:

      
      

      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.

      Standard Voltage
      Tester Connection Condition Specified Condition 2K-3 - Battery negative (-) terminal Battery voltage applied between terminals 2G-1 and A-14 (TRLY) 11 to 14 V Battery voltage not applied between terminals 2G-1 and A-14 (TRLY) Below 1 V

      Result

      Result	Proceed to
      OK (for LHD)	A
      OK (for RHD)	B
      NG (for LHD)	C
      NG (for RHD)	D

   
   

   A

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

   B

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

   C

   REPLACE COWL SIDE JUNCTION BLOCK LH Click here

   D

   REPLACE COWL SIDE JUNCTION BLOCK LH Click here