Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

CHECK WHETHER FRONT FOG LIGHTS ILLUMINATE

Check whether the front fog lights illuminate.

Result

RESULT CHART

Condition	Proceed to
Neither left nor right fog light Illuminates	A
Either left or right fog light Illuminates	B

B: Go to step 7

A: GO TO NEXT STEP

INSPECT FUSE (FR FOG)
1. Remove the FR FOG fuse from the main body ECU.
2. Measure the resistance.
  Standard resistance: Below 1 Ω
3. Reinstall the FR FOG fuse.
NG: REPLACE FUSE

OK: GO TO NEXT STEP

INSPECT FRONT FOG LIGHT RELAY

Remove the front fog light relay.

Measure the resistance.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
3-5	10 kΩ or higher
3-5	Below 1 Ω (When battery voltage applied to terminals 1 and 2)

Reinstall the front fog light relay.

Fig 1: Measuring Resistance Between Front Fog Light Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FRONT FOG LIGHT RELAY

OK: GO TO NEXT STEP

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

Remove the front fog light relay.

Measure the voltage.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

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

Reinstall the front fog light relay.

Fig 2: Identifying Front Fog Light Relay Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

INSPECT HEADLIGHT DIMMER SWITCH

Remove the headlight dimmer switch.
Inspect the front fog light switch.

Measure the resistance.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
3 (BFG)-4 (LFG)	Front fog light switch OFF	10 kΩ or higher
3 (BFG)-4 (LFG)	Front fog light switch ON	Below 1 Ω

Reinstall the headlight dimmer switch.

Fig 3: Identifying Terminals Of Headlight Dimmer Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HEADLIGHT DIMMER SWITCH

OK: GO TO NEXT STEP

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

Disconnect the D4 headlight dimmer switch connector.

Measure the voltage.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
D4-3 (BFG) - Body ground	Always	11 to 14V

Reconnect the headlight dimmer switch connector.

Fig 4: Identifying Terminals Of D4 Headlight Dimmer Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT DIMMER SWITCH - BODY GROUND)

INSPECT BULB (FRONT FOG LIGHT BULB)

Remove the front fog light assembly.

Apply battery voltage to the terminals and check that the front fog light illuminates.

Standard

TERMINALS VOLTAGES CHART

Measurement Condition	Standard
Positive battery - Terminal 2 Negative battery - Terminal 1	Front fog light illuminates

Reinstall the front fog light assembly.

Fig 5: Identifying Terminals Of D4 Headlight Dimmer Switch Connector

NG: REPLACE BULB

OK: GO TO NEXT STEP

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

Disconnect the B9 and B10 front fog light assembly connectors.

Measure the voltage.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
B9-2 - Body ground	Front fog light switch ON	11 to 14 V
B10-2-Body ground	Front fog light switch ON	11 to 14 V

Reconnect the front fog light assembly connectors.

Fig 6: Identifying Terminals Of Front Fog Light Assembly Connectors

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT FOG LIGHT ASSEMBLY - BODY GROUND)