LIGHTING SYSTEM Taillight Relay Circuit

DESCRIPTION

• The main body ECU receives the light control switch TAIL signal to control the taillight relay.

• When the light control switch is in the AUTO position, the main body ECU receives the ambient light level signal from the automatic light control sensor to control the taillight relay.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the intelligent tester on.

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

   5. Check the operation.

      Main Body

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

      OK
      Taillight relay operates. (Taillights illuminate.)

   
   

   NG

   CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU) Click here

   OK

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

2. CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU)

   
   

   1. 

      Disconnect the 4M main body ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition 4M-1 - Body ground Always 11 to 14 V

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE MAIN BODY ECU Click here