RM38T0EC _59 Vehicle Exterior _112294 LIGHTING (EXT) _0510962 LIGHTING SYSTEM J

LIGHTING (EXT)  LIGHTING SYSTEM  Front Fog Light Circuit  


DESCRIPTION

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

WIRING DIAGRAM

E445363E26
4.354,3.573 5.823,3.99 1.469,0.417 10 false Power Distribution Box Assembly 4.292,1.979 5.396,2.198 1.104,0.219 10 false FOG FR RLY-S 0.823,3.083 2.427,3.323 1.604,0.24 10 false Fog Light Assembly LH 2.031,2.375 2.271,2.583 0.24,0.208 10 false B 1.219,2.375 1.5,2.615 0.281,0.24 10 false E 1.24,3.552 1.458,3.781 0.219,0.229 10 false E 6.25,1.896 6.854,2.281 0.604,0.385 10 false CXP1 2.042,3.542 2.323,3.771 0.281,0.229 10 false B 5.49,5.104 7.156,5.604 1.667,0.5 10 false Main Body ECU (Multiplex Network Body ECU) 1.396,1.906 2,2.292 0.604,0.385 10 false FR FOG 2.156,0.531 3.646,0.771 1.49,0.24 10 false from Auxiliary Battery 0.823,4.26 2.521,4.76 1.698,0.5 10 false Fog Light Assembly RH 5.49,4.938 6.115,5.177 0.625,0.24 10 false MB 5.979,1.729 6.24,1.969 0.26,0.24 10 false 22 3.677,1.344 4.073,1.615 0.396,0.271 10 false 8F 3.677,1.135 4.031,1.365 0.354,0.229 10 false 25 0.99,1.24 1.208,1.469 0.219,0.229 10 false 2 2.281,2.365 2.573,2.583 0.292,0.219 10 false 2 0.99,2.354 1.208,2.604 0.219,0.25 10 false 1 2.302,3.542 2.573,3.781 0.271,0.24 10 false 2 1,3.521 1.292,3.708 0.292,0.188 10 false 1 0.844,2.917 1.26,3.104 0.417,0.188 10 false A43 0.833,4.083 1.208,4.292 0.375,0.208 10 false A42 5.552,1.885 5.813,2.125 0.26,0.24 10 false IC 0.99,1.5 1.208,1.729 0.219,0.229 10 false 3 2.271,1.25 2.49,1.479 0.219,0.229 10 false 1 2.281,1.5 2.5,1.729 0.219,0.229 10 false 5 3.656,2.229 4.052,2.5 0.396,0.271 10 false 8C 3.667,2.031 4.021,2.26 0.354,0.229 10 false 25 3.667,2.927 4.021,3.156 0.354,0.229 10 false 45 0.906,5.417 2.833,5.688 1.927,0.271 10 false : CXPI Communication Line 0.719,0.729 1.323,1.115 0.604,0.385 10 false FOG FR 3.677,3.125 4.031,3.354 0.354,0.229 10 false 8B 1.406,2.688 2.115,2.906 0.708,0.219 10 false Fog Light 1.385,3.844 2.094,4.063 0.708,0.219 10 false Fog Light

CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*1

·

First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CXPI communication malfunctions before troubleshooting this symptom.

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

*1: w/ Smart Entry and Start System




PROCEDURE

1.READ VALUE USING GTS
a.

Read the Data List according to the display on the GTS.

Body Electrical > Power Distribution Box > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Front Fog Light External Relay Input Signal Front fog light external relay input OFF or ON OFF: Front fog light is not input
ON: Front fog light is input 		-
Body Electrical > Power Distribution Box > Data List
Tester Display
Front Fog Light External Relay Input Signal
50003 475 1320
OK:

Display changes according to the front fog light switch operation.



Result:
Proceed to
OK
NG



OK

2.READ VALUE USING GTS

NG

7.CHECK HARNESS AND CONNECTOR (POWER SOURCE - FOG FR RELAY)
2.READ VALUE USING GTS
a.

Using the GTS, read the Data List.

Body Electrical > Power Distribution Box > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note
Front Fog Light External Relay Output Signal Front fog light external relay output OFF or ON OFF: Front fog lights off
ON: Front fog lights on 		-
Body Electrical > Power Distribution Box > Data List
Tester Display
Front Fog Light External Relay Output Signal
50003 475 1321
OK:

Display changes according to the front fog light switch operation.



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - BODY GROUND)

NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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


3.CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - BODY GROUND)
a.

Disconnect the 8C and 8F power distribution box assembly connectors.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
8C-25 - Body ground Always Below 1 Ω
8B-45 - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

4.INSPECT FOG FR RELAY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.INSPECT FOG FR RELAY
HINT:

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


Result:
Proceed to
OK
NG



OK

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

NG

REPLACE FOG FR RELAY

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

Disconnect the A43 front fog light assembly LH connector.


b.

Disconnect the A42 front 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
5 (FOG FR relay) - A43-2 (B) Always Below 1 Ω
5 (FOG FR relay) - A42-2 (B) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

Standard Resistance:
Tester Connection Condition Specified Condition
A43-1 (E) - Body ground Always Below 1 Ω
A42-1 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Remove the FOG FR relay.


b.

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

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



Result:
Proceed to
OK
NG



OK

8.INSPECT FOG FR RELAY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.INSPECT FOG FR RELAY
HINT:

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


Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (FOG FR RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPLACE FOG FR RELAY

9.CHECK HARNESS AND CONNECTOR (FOG FR RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.

Disconnect the 8F power distribution box assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1 (FOG FR relay) - 8F-25 Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the A43 front fog light assembly LH connector.


b.

Disconnect the A42 front 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
5 (FOG FR relay) - Body ground Always 10 kΩ or higher
A43-2 (B) - Body ground Always 10 kΩ or higher
A42-2 (B) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR