LIGHTING (EXT)  LIGHTING SYSTEM  Front Fog Light Circuit  


DESCRIPTION

The main body ECU (multiplex network body ECU) controls the front fog lights.

WIRING DIAGRAM

E366949E01
3.604,0.604 3.917,0.802 0.313,0.198 10 false 3B 1.104,0.583 2.177,0.781 1.073,0.198 10 false from Battery 1.115,1.229 2.188,1.427 1.073,0.198 10 false from Battery 2.563,0.76 2.979,1.021 0.417,0.26 10 false ALT 2.479,1.396 3.177,1.656 0.698,0.26 10 false FOG FR 4.958,1.208 5.333,1.458 0.375,0.25 10 false TAIL 6.115,0.625 6.74,0.875 0.625,0.25 10 false TRLY 5.865,0.51 6.49,0.76 0.625,0.25 10 false 14 3.635,0.396 4.271,0.635 0.635,0.24 10 false 1 0.698,2.323 1.323,2.573 0.625,0.25 10 false 1 1.615,2.313 2.24,2.563 0.625,0.25 10 false 2 2.333,2.323 2.958,2.573 0.625,0.25 10 false 3 3.01,2.323 3.635,2.573 0.625,0.25 10 false 5 3,2.75 3.625,3 0.625,0.25 10 false 2 2.344,2.74 2.969,2.99 0.625,0.25 10 false 1 0.479,2.771 1.104,3.021 0.625,0.25 10 false A19 0.479,2.927 1.99,3.24 1.51,0.313 10 false Fog Light Assembly LH 2.333,3.125 3.406,3.323 1.073,0.198 10 false FR FOG RLY 3.594,2.646 4.219,2.896 0.625,0.25 10 false 41 3.594,2.854 4.219,3.104 0.625,0.25 10 false 3D 3.604,3.438 4.229,3.688 0.625,0.25 10 false 42 3.594,3.646 4.219,3.896 0.625,0.25 10 false 3C 4.958,3 5.333,3.271 0.375,0.271 10 false TAIL 6.115,3.656 6.646,3.969 0.531,0.313 10 false FFGO 0.5,4.396 1.125,4.646 0.625,0.25 10 false A16 0.49,4.552 2.479,4.958 1.99,0.406 10 false Fog Light Assembly RH 3.875,4.135 5.479,4.531 1.604,0.396 10 false Instrument Panel Junction Block Assembly 5.479,4.635 7.135,5.177 1.656,0.542 10 false Main Body ECU (Multiplex Network Body ECU) 5.469,4.469 6.094,4.719 0.625,0.25 10 false MB 0.698,3.948 1.323,4.198 0.625,0.25 10 false 1 1.625,3.948 2.25,4.198 0.625,0.25 10 false 2 5.854,3.542 6.479,3.792 0.625,0.25 10 false 13

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


PROCEDURE

1.CHECK OPERATION (TAILLIGHTS)
a.

Check the operation of the taillights.

OK:

Taillights operate normally.



Result:
Proceed to
OK
NG



OK

2.PERFORM ACTIVE TEST USING GTS

NG

GO TO PROBLEM SYMPTOMS TABLE

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM>PROBLEM SYMPTOMS TABLE


2.PERFORM ACTIVE TEST USING GTS
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / Main Body / Active Test.


e.

Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Front Fog Light Relay Front fog light relay OFF or ON Light control switch in tail position
Body Electrical > Main Body > Active Test
Tester Display
Front Fog Light Relay
50004 123 16
OK:

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



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM>PROBLEM SYMPTOMS TABLE


NG

3.CHECK HARNESS AND CONNECTOR (POWER SOURCE - FR FOG RLY RELAY)
3.CHECK HARNESS AND CONNECTOR (POWER SOURCE - FR FOG RLY RELAY)
a.

Remove the FR FOG RLY relay from the No. 4 relay block assembly.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
5 (FR FOG RLY relay terminal) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY INPUT VOLTAGE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY INPUT VOLTAGE)
a.

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

Standard Voltage:
Tester Connection Condition Specified Condition
2 (FR FOG RLY relay terminal) - Body ground Light control switch in tail or head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

5.INSPECT FR FOG RLY RELAY

NG

9.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
5.INSPECT FR FOG RLY RELAY
a.

Inspect the FR FOG RLY relay.

Click hereVehicle Exterior>LIGHTING (EXT)>RELAY>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

6.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY - FOG LIGHT ASSEMBLY)

NG

REPLACE FR FOG RLY RELAY

6.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY - FOG LIGHT ASSEMBLY)
a.

Disconnect the A19 fog light assembly LH connector.


b.

Disconnect the A16 fog light assembly RH connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
3 (FR FOG RLY relay terminal) - A19-2 Always Below 1 Ω
3 (FR FOG RLY relay terminal) - A16-2 Always Below 1 Ω
3 (FR FOG RLY relay terminal) or A19-2 - Body ground Always 10 kΩ or higher
3 (FR FOG RLY relay terminal) or A16-2 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
a.

Disconnect the 3C instrument panel junction block assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1 (FR FOG RLY relay terminal) - 3C-42 Always Below 1 Ω
1 (FR FOG RLY relay terminal) or 3C-42 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

8.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
E259586C03
1.146,0.302 1.469,0.49 0.323,0.188 4.604,0.302 4.958,0.51 0.354,0.208 4.375,1.417 4.51,1.063 false 1.229,0.313 1.542,0.51 0.313,0.198 10 3C 4.688,0.323 5,0.521 0.313,0.198 10 MB 4.167,1.458 4.781,1.656 0.615,0.198 10 FFGO 0.167,0.104 0.479,0.302 0.313,0.198 10 *a
*a Component without harness connected
(Instrument Panel Junction Block Assembly) 		- -


a.

Remove the instrument panel junction block assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
3C-42 - MB-13 (FFGO) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


9.CHECK HARNESS AND CONNECTOR (FR FOG RLY RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
a.

Disconnect the 3D instrument panel junction block assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
2 (FR FOG RLY relay terminal) - 3D-41 Always Below 1 Ω
2 (FR FOG RLY relay terminal) or 3D-41 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR