Front Fog Light Circuit: Procedure

1. Remove the FR FOG fuse from the instrument panel junction block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   FR FOG fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Remove the front fog light relay.
   Fig 1: Identifying Fog Light Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω

NG → REPLACE FRONT FOG LIGHT RELAY 

OK: Go to next step 

1. Install the FR FOG fuse.
   Fig 2: Identifying Front Fog Light Relay Terminals (No. 8 Relay Block)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2 - Body ground	Always	11 to 14 V
   5 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the headlight dimmer switch assembly.
   Fig 3: Inspecting Headlight Dimmer Switch Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   3 (LFG) - 4 (BFG)	Fog light switch off	10 kΩ or higher
   3 (LFG) - 4 (BFG)	Fog light switch on	Below 1 Ω

3. Reinstall the headlight dimmer switch assembly.

NG → See step   9 

OK: Go to next step 

1. Disconnect the E12 headlight dimmer switch assembly connector.
   Fig 4: Checking Harness And E12 Connector (Front Fog Light Relay - Headlight Dimmer Switch Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Front fog light relay terminal 1 - E12-4 (BFG)	Always	Below 1 Ω
   Front fog light relay terminal 1 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E42 daytime running light relay connector.
   Fig 5: Checking Harness And E12 & E42 Connector (Headlight Dimmer Switch Assembly - Daytime Running Light Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E12-3 (LFG) - E42-2 (FOG)	Always	Below 1 Ω
   E12-3 (LFG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A18 fog light assembly LH connector and the A15 fog light assembly RH connector.
   Fig 6: Identifying A18 Fog Light Assembly LH Connector & A15 Fog Light Assembly RH Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Front fog light relay terminal 3 - A18-2	Always	Below 1 Ω
   Front fog light relay terminal 3 - Body ground	Always	10 kΩ or higher
   Front fog light relay terminal 3 - A15-2	Always	Below 1 Ω
   Front fog light relay terminal 3 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 7: Identifying Fog Light Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A18-1 - Body ground	Always	Below 1 Ω
   A15-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10