Front Fog Light Circuit [08/2015 - 08/2019]: Procedure

1. Using the Techstream, perform the Active Test (Refer to DATA LIST / ACTIVE TEST [08/2015 - 08/2016] , or refer to DATA LIST / ACTIVE TEST [08/2016 - 08/2019] ).
   MAIN BODY
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Front Fog Light Relay	Front fog light relay	ON/OFF	The headlight dimmer switch is in the tail position.

   OK

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

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the driver side junction block with its connectors still connected (Refer to REMOVAL [08/2015 - 08/2019] ).
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   2F-9 - Body ground	Headlight dimmer switch in tail and front fog light switch on	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Driver Side Junction Block Assembly)

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - FOG LIGHT ASSEMBLY) 

Result: 

NG 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [08/2015 - 08/2016] , or refer to PROBLEM SYMPTOMS TABLE [08/2016 - 08/2019] )