Front Fog Light Circuit [03/2017 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
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	Light control switch is in TAIL position

   OK

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

   Result

   Result	Proceed to
   NG	A
   OK	B

Result: 

B 

REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [06/2016 - ] 

Result: 

A 

See step  2

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [06/2016 - ]

2. Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   MB-30 (FFGO) - Battery negative (-) terminal	Connect a positive (+) lead from the battery → 3E-1 Connect a negative (-) lead from the battery → MB-7 (TRLY)	11 to 14 V
   3C-3 - Battery negative (-) terminal	Connect a positive (+) lead from the battery → 3E-1 Connect a negative (-) lead from the battery → MB-7 (TRLY), MB-30 (FFGO)	11 to 14 V
   3C-5 - Battery negative (-) terminal	Connect a positive (+) lead from the battery → 3E-1 Connect a negative (-) lead from the battery → MB-7 (TRLY), MB-30 (FFGO)	11 to 14 V

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [03/2017 - ] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [06/2016 - ]