LIGHTING (EXT) LIGHTING SYSTEM Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.

WIRING DIAGRAM

3.792,0.729 4.104,0.927 0.313,0.198 10 false 3A 0.615,0.719 1.531,0.917 0.917,0.198 10 false from Battery 1.99,0.875 2.438,1.115 0.448,0.24 10 false DRL 1.406,2.542 2.875,3.156 1.469,0.615 10 false Headlight Assembly LH (Daytime Running Light) 2.906,1.427 3.292,1.656 0.385,0.229 10 false DRL 1.396,2.396 1.854,2.615 0.458,0.219 10 false A43 1.823,2.031 2.281,2.25 0.458,0.219 10 false E 2.375,2.031 2.833,2.25 0.458,0.219 10 false B 2.563,1.927 3.021,2.146 0.458,0.219 10 false 6 1.635,1.938 2.094,2.156 0.458,0.219 10 false 8 2.625,1.063 3.083,1.281 0.458,0.219 10 false 3 2.615,0.635 3.073,0.854 0.458,0.219 10 false 1 3.313,0.635 3.771,0.854 0.458,0.219 10 false 2 3.313,1.073 3.771,1.292 0.458,0.219 10 false 5 3.802,0.5 4.26,0.719 0.458,0.219 10 false 51 5.865,0.625 6.323,0.844 0.458,0.219 10 false 26 6.104,0.708 6.563,0.927 0.458,0.219 10 false DRLE 4.271,1.146 5.875,1.823 1.604,0.677 10 false Instrument Panel Junction Block Assembly 5.333,4.583 6.99,5.219 1.656,0.635 10 false Main Body ECU (Multiplex Network Body ECU) 5.323,4.417 5.781,4.635 0.458,0.219 10 false MB 1.813,4.01 2.271,4.229 0.458,0.219 10 false E 2.375,4.021 2.833,4.24 0.458,0.219 10 false B 2.573,3.896 3.031,4.115 0.458,0.219 10 false 6 1.635,3.906 2.094,4.125 0.458,0.219 10 false 8 1.406,4.333 1.865,4.552 0.458,0.219 10 false A45 1.406,4.49 2.896,5 1.49,0.51 10 false Headlight Assembly RH (Daytime Running Light)

CAUTION / NOTICE / HINT

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

PROCEDURE

1.CHECK OPERATION (CLEARANCE LIGHTS)

Check the operation of the clearance lights.

OK:: Clearance lights operate normally.

Result:

Proceed to
OK
NG

2.PERFORM ACTIVE TEST USING GTS

GO TO PROBLEM SYMPTOMS TABLE

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

2.PERFORM ACTIVE TEST USING GTS

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

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

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
Daytime Running Light	Daytime running lights	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Daytime Running Light

50004 123 63

OK:: Daytime running lights illuminate.

Result:

Proceed to
OK
NG

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

3.INSPECT DRL RELAY

Remove the DRL relay from the engine room relay block and junction block assembly.

Inspect the DRL relay.

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

Result:

Proceed to
OK
NG

4.CHECK HARNESS AND CONNECTOR (POWER SOURCE - DRL RELAY)

REPLACE DRL RELAY

4.CHECK HARNESS AND CONNECTOR (POWER SOURCE - DRL RELAY)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
1 (DRL relay terminal) - Body ground	Always	11 to 14 V
3 (DRL relay terminal) - Body ground	Always	11 to 14 V

Result:

Proceed to
OK
NG

5.CHECK HARNESS AND CONNECTOR (DRL RELAY - HEADLIGHT ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK HARNESS AND CONNECTOR (DRL RELAY - HEADLIGHT ASSEMBLY)

Disconnect the A43 headlight assembly LH connector.

Disconnect the A45 headlight assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (DRL relay terminal) - A43-6 (B)	Always	Below 1 Ω
5 (DRL relay terminal) - A45-6 (B)	Always	Below 1 Ω
5 (DRL relay terminal) or A43-6 (B) - Body ground	Always	10 kΩ or higher
5 (DRL relay terminal) or A45-6 (B) - Body ground	Always	10 kΩ or higher

Result:

Proceed to
OK
NG

6.CHECK HARNESS AND CONNECTOR (DRL RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK HARNESS AND CONNECTOR (DRL RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

Disconnect the 3A instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (DRL relay terminal) - 3A-51	Always	Below 1 Ω
2 (DRL relay terminal) or 3A-51 - Body ground	Always	10 kΩ or higher

Result:

Proceed to
OK
NG

7.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

1.156,0.229 1.458,0.448 0.302,0.219 4.729,0.25 5.042,0.479 0.313,0.229 6.146,1.438 6.021,1.063 false 1.219,0.25 1.531,0.448 0.313,0.198 10 false 3A 4.781,0.271 5.094,0.469 0.313,0.198 10 false MB 6.063,1.448 6.521,1.646 0.458,0.198 10 false DRLE 0.156,0.104 0.469,0.302 0.313,0.198 10 false *a

Component without harness connected
(Instrument Panel Junction Block Assembly)

Remove the instrument panel junction block assembly.

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3A-51 - MB-26 (DRLE)	Always	Below 1 Ω

Result:

Proceed to
OK
NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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