Lighting (Ext). Lighting System Front Fog Light Circuit

Vehicle Exterior. Corolla. Zre142 Aze141

Lighting (Ext). Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (FR FOG)

INSPECT FRONT FOG LIGHT RELAY

CHECK HARNESS AND CONNECTOR (BATTERY - FRONT FOG LIGHT RELAY)

INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - HEADLIGHT DIMMER SWITCH ASSEMBLY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - DAYTIME RUNNING LIGHT RELAY)

CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - FOG LIGHT ASSEMBLY)

CHECK HARNESS AND CONNECTOR (FOG LIGHT ASSEMBLY - BODY GROUND)

LIGHTING SYSTEM - Front Fog Light Circuit

DESCRIPTION

When both of the following conditions are met, the front fog lights come on:

The low beam headlights are turned on using either automatic light control or manual operation, and the high beam headlights are off.
Front fog light switch is on.

WIRING DIAGRAM

Corolla. Zre142 Aze141.Lighting (Ext).Lighting System.Lighting System Front Fog Light Circuit

INSPECTION PROCEDURE

1.INSPECT FUSE (FR FOG)

Remove the FR FOG fuse from the instrument panel junction block.

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

REPLACE FUSE

OK

2.INSPECT FRONT FOG LIGHT RELAY

Remove the front fog light relay.

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

REPLACE FRONT FOG LIGHT RELAY

OK

3.CHECK HARNESS AND CONNECTOR (BATTERY - FRONT FOG LIGHT RELAY)

for TMC Made
1. Install the FR FOG fuse.
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

except TMC Made
1. Install the FR FOG fuse.
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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

Remove the headlight dimmer switch assembly.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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

Reinstall the headlight dimmer switch assembly.

REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY (COROLLA_ZRE142 RM000002VQI00YX.html)

OK

5.CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - HEADLIGHT DIMMER SWITCH ASSEMBLY)

for TMC Made
1. Disconnect the E8 headlight dimmer switch assembly connector.
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 - E8-4 (BFG)
  Always
  Below 1 Ω
  Front fog light relay terminal 1 - Body ground
  Always
  10 kΩ or higher

except TMC Made
1. Disconnect the E8 headlight dimmer switch assembly connector.
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 - E8-4 (BFG)
  Always
  Below 1 Ω
  Front fog light relay terminal 1 - Body ground
  Always
  10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - DAYTIME RUNNING LIGHT RELAY)

Disconnect the E91 daytime running light relay connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E8-3 (LFG) - E91-2 (FOG)
Always
Below 1 Ω
E8-3 (LFG) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.CHECK HARNESS AND CONNECTOR (FRONT FOG LIGHT RELAY - FOG LIGHT ASSEMBLY)

for TMC Made

Disconnect the A25 fog light assembly LH connector and the A22 fog light assembly RH connector.

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 - A25-2	Always	Below 1 Ω
Front fog light relay terminal 3 - Body ground	Always	10 kΩ or higher
Front fog light relay terminal 3 - A22-2	Always	Below 1 Ω
Front fog light relay terminal 3 - Body ground	Always	10 kΩ or higher

except TMC Made

Disconnect the A25 fog light assembly LH connector and the A22 fog light assembly RH connector.

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 - A25-2	Always	Below 1 Ω
Front fog light relay terminal 3 - Body ground	Always	10 kΩ or higher
Front fog light relay terminal 3 - A22-2	Always	Below 1 Ω
Front fog light relay terminal 3 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.CHECK HARNESS AND CONNECTOR (FOG LIGHT ASSEMBLY - BODY GROUND)

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection
Condition
Specified Condition
A25-1 - Body ground
Always
Below 1 Ω
A22-1 - Body ground
Always
Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000002CE20DLX.html)

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