Taillight Relay Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Active Test.
5. Check that the relay operates.
   MAIN BODY
   
   

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

   OK

   Taillight relay operates. (Taillights illuminate.)

NG → See step   2 

OK → See step   4 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
   Fig 1: Measuring Voltage Of Instrument Panel Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect a positive (+) lead from the auxiliary battery to terminal 2E-1.
3. Connect a negative (-) lead from the auxiliary battery to terminal MB-14.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2C-10 - Auxiliary battery negative	Always	11 to 14 V
   2D-18 - Auxiliary battery negative	Always	11 to 14 V
   2B-7 - Auxiliary battery negative	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Instrument Panel Junction Block Assembly)

NG → See step   6 

OK: Go to next step 

1. Disconnect the 2E 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
   2E-1 - Body ground	Power switch off	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5