LIGHTING (EXT)  LIGHTING SYSTEM  High Beam Headlight Circuit  


DESCRIPTION

The main body ECU (multiplex network body ECU) controls the high beam headlights.

WIRING DIAGRAM

E372460E01
5.396,4.5 6.01,4.76 0.615,0.26 10 false MB 5.396,4.656 7.021,5.052 1.625,0.396 10 false Main Body ECU (Multiplex Network Body ECU) 4.292,1.104 5.896,1.552 1.604,0.448 10 false Instrument Panel Junction Block Assembly 6,0.74 6.615,1 0.615,0.26 10 false DIM 5.75,0.635 6.365,0.896 0.615,0.26 10 false 22 4.229,0.531 4.844,0.792 0.615,0.26 10 false 52 4.229,0.729 4.844,0.99 0.615,0.26 10 false 3A 3.677,0.646 3.885,0.854 0.208,0.208 10 false 2 3.688,1.094 3.927,1.302 0.24,0.208 10 false 5 2.875,0.635 3.104,0.823 0.229,0.188 10 false 1 2.885,1.104 3.135,1.302 0.25,0.198 10 false 3 3.208,1.469 3.823,1.729 0.615,0.26 10 false DIM 2.135,1.344 2.948,1.594 0.813,0.25 10 false H-LP-MAIN 0.573,0.708 1.896,1 1.323,0.292 10 false from H-LP Relay 0.802,1.177 1.75,1.458 0.948,0.281 10 false from Battery 0.813,2.344 1.427,2.604 0.615,0.26 10 false 8 0.99,2.344 1.604,2.604 0.615,0.26 10 false E 2.208,2.354 2.823,2.615 0.615,0.26 10 false SOL 2.563,2.344 3.177,2.604 0.615,0.26 10 false 7 2.885,2.583 3.74,2.833 0.854,0.25 10 false H-LP LH-HI 1.479,4.458 2.094,4.719 0.615,0.26 10 false Solenoid 1.042,3.208 1.656,3.469 0.615,0.26 10 false A43 1.031,3.365 2.729,3.635 1.698,0.271 10 false Headlight Assembly LH 1.5,2.646 2.115,2.906 0.615,0.26 10 false Solenoid 1.052,5.052 1.667,5.313 0.615,0.26 10 false A45 1.052,5.198 2.75,5.469 1.698,0.271 10 false Headlight Assembly RH 2.875,4.438 3.729,4.688 0.854,0.25 10 false H-LP RH-HI 0.813,4.208 1.427,4.469 0.615,0.26 10 false 8 0.979,4.208 1.594,4.469 0.615,0.26 10 false E 2.219,4.198 2.833,4.458 0.615,0.26 10 false SOL 2.563,4.198 3.177,4.458 0.615,0.26 10 false 7

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

Check the operation of the low beam headlights. If the low beam headlights do not operate normally, refer to Problem Symptoms Table.

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



PROCEDURE

1.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
Head Light Hi DIM relay OFF or ON -
Body Electrical > Main Body > Active Test
Tester Display
Head Light Hi
50004 123 15
OK:

The high beam headlights illuminate.



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.INSPECT DIM RELAY
2.INSPECT DIM RELAY
a.

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



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (POWER SOURCE - DIM RELAY)

NG

REPLACE DIM RELAY

3.CHECK HARNESS AND CONNECTOR (POWER SOURCE - DIM RELAY)
a.

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

Standard Voltage:
Tester Connection Condition Specified Condition
1 (DIM relay terminal) - Body ground Always 11 to 14 V
3 (DIM relay terminal) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (DIM RELAY - HEADLIGHT ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (DIM RELAY - HEADLIGHT ASSEMBLY)
a.

Disconnect the A43 headlight assembly LH connector.


b.

Disconnect the A45 headlight assembly RH connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
5 (DIM relay terminal) - A43-7 (SOL) Always Below 1 Ω
5 (DIM relay terminal) - A45-7 (SOL) Always Below 1 Ω
5 (DIM relay terminal) or A43-7 (SOL) - Body ground Always 10 kΩ or higher
5 (DIM relay terminal) or A45-7 (SOL) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (DIM RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK HARNESS AND CONNECTOR (DIM RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
a.

Disconnect the 3A 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 (DIM relay terminal) - 3A-52 Always Below 1 Ω
2 (DIM relay terminal) or 3A-52 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

6.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
E259586C02
1.156,0.229 1.458,0.448 0.302,0.219 4.729,0.25 5.042,0.479 0.313,0.229 5.802,1.417 5.594,1.052 false 1.24,0.271 1.552,0.469 0.313,0.198 10 3A 4.802,0.292 5.115,0.49 0.313,0.198 10 MB 5.771,1.448 6.229,1.646 0.458,0.198 10 DIM 0.156,0.104 0.469,0.302 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
3A-52 - MB-22 (DIM) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY