Front Fog Light 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
   Front Fog Light Relay	Front fog light relay	ON/OFF	-

   OK

   Front fog light relay operates. (Front fog lights come on.)

NG → See step   2 

OK → See step   5 

1. Check the operation of the taillights.

   OK

   Taillights operate normally.

NG → See step   6 

OK: Go to next step 

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 terminals MB-14 and MB-13.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2C-8 - Auxiliary battery negative	Power switch off	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   7 

OK: Go to next step 

1. Disconnect the 2C instrument panel junction block assembly connector.
2. Disconnect the C4 or C6 fog light assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C4-2 - 2C-8	Always	Below 1 Ω
   C6-2 - 2C-8	Always	Below 1 Ω
   2C-8 - Body ground	Always	10 kΩ or higher
   C4-1 - Body ground	Always	Below 1 Ω
   C6-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8