LIGHTING SYSTEM Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the operation of the TAIL relay.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   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. Check that the relay operates.

      Table 1. Main Body

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

      OK
      Taillight relay operates. (Taillights illuminate.)

   
   
   • OK

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

   • NGClick here
2. Click here

   CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

   
   
   1. 

      Disconnect the 3E*1 or 3F*2 instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition 3E-1*1 - Body ground Always 11 to 14 V 3F-1*2 - Body ground Always 11 to 14 V

      
      

      • *1: for LHD

      • *2: for RHD

      Table 2. Text in Illustration

      *A	for LHD
      *B	for RHD
      *a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

3. Click here

   INSPECT 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.

      Table 3. Text in Illustration

      *A	for LHD	*B	for RHD
      *a	Component without harness connected (Instrument Panel Junction Block Assembly)	-	-

   3. Connect a positive (+) lead from the auxiliary battery to terminal 3E-1*1 or 3F-1*2.

   4. Connect a negative (-) lead from the auxiliary battery to terminal MB-14 (TRLY).

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

      Standard Voltage
      Tester Connection Condition Specified Condition 3D-7 - Auxiliary battery negative terminal Always 11 to 14 V 3D-8 - Auxiliary battery negative terminal Always 11 to 14 V 3C-5 - Auxiliary battery negative terminal Always 11 to 14 V

      
      

      • *1: for LHD

      • *2: for RHD

   
   
   • OK

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

   • NG

     REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (Click here)