LIGHTING (EXT)  AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM  Speed Signal Circuit  


DESCRIPTION

The headlight leveling ECU assembly receives the vehicle speed signal from the combination meter assembly.

HINT:
·

A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective system based on this pulse signal.

·

If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.



WIRING DIAGRAM

E372001E01
5.708,2.771 6.917,3.396 1.208,0.625 10 false Combination Meter Assembly 5.323,2.771 5.781,2.969 0.458,0.198 10 false E43 0.167,6.125 1.698,6.698 1.531,0.573 10 false Certification ECU (Smart Key ECU Assembly)*5 0.167,5.948 0.781,6.146 0.615,0.198 10 false E110 1.375,5.552 1.688,5.75 0.313,0.198 10 false 27 1.906,6.24 5.573,6.438 3.667,0.198 10 false No. 3 Junction Connector 1.906,6.052 2.365,6.25 0.458,0.198 10 false E54 3.542,4.615 5.177,5.083 1.635,0.469 10 false Instrument Panel Junction Block Assembly 3.563,4.115 3.875,4.313 0.313,0.198 10 false 3D 3.542,3.896 3.854,4.094 0.313,0.198 10 false 19 2.75,3.99 2.906,4.188 0.156,0.198 10 false 8 0.177,4.583 1.688,5.052 1.51,0.469 10 false Windshield Wiper Relay Assembly*4 0.167,4.396 0.625,4.594 0.458,0.198 10 false E95 1.917,3.99 2.073,4.188 0.156,0.198 10 false 7 1.917,5.552 2.073,5.75 0.156,0.198 10 false 9 5.573,4.594 7.031,5.083 1.458,0.49 10 false Headlight Leveling ECU Assembly*3 5.573,4.396 6.031,4.594 0.458,0.198 10 false A60 5.521,4 5.833,4.198 0.313,0.198 10 false 16 5.781,3.979 6.396,4.177 0.615,0.198 10 false SPDR 0.969,5.552 1.427,5.75 0.458,0.198 10 false SPD 1.365,4 1.677,4.198 0.313,0.198 10 false 24 0.938,4 1.396,4.198 0.458,0.198 10 false SPD 4.729,4.115 5.042,4.313 0.313,0.198 10 false 3A 3.563,2.208 3.875,2.406 0.313,0.198 10 false 41 0.688,2.75 1.146,2.948 0.458,0.198 10 false ECM 0.354,2.75 0.813,2.948 0.458,0.198 10 false A40 1.385,2.323 1.698,2.521 0.313,0.198 10 false 44 0.927,2.323 1.385,2.521 0.458,0.198 10 false SPD 0.927,0.438 1.385,0.635 0.458,0.198 10 false SP1 1.375,0.552 1.833,0.75 0.458,0.198 10 false A64 1.406,0.344 1.719,0.542 0.313,0.198 10 false 11 1.76,0.552 2.219,0.75 0.458,0.198 10 false A48 1.802,0.344 2.115,0.542 0.313,0.198 10 false 22 0.167,1.115 1.76,1.583 1.594,0.469 10 false Brake Actuator Assembly (Skid Control ECU) 1.427,0.781 1.74,0.979 0.313,0.198 10 false *1 1.813,0.781 2.125,0.979 0.313,0.198 10 false *2 3.552,2.427 3.865,2.625 0.313,0.198 10 false 3A 4.74,2.427 5.052,2.625 0.313,0.198 10 false 3D 4.74,2.219 5.052,2.417 0.313,0.198 10 false 37 5.813,2.406 6.125,2.604 0.313,0.198 10 false +S 5.552,2.292 5.708,2.49 0.156,0.198 10 false 6 5.813,0.552 6.125,0.75 0.313,0.198 10 false SI 5.573,0.438 5.729,0.635 0.156,0.198 10 false 5 3.625,5.344 5.156,5.542 1.531,0.198 10 false *1: w/ VSC 5.188,5.344 6.719,5.542 1.531,0.198 10 false *2: w/o VSC 3.625,5.76 6.99,6.156 3.365,0.396 10 false *3: for LED Headlight 3.625,6.167 5.906,6.49 2.281,0.323 10 false *5: w/ Smart Entry and Start System 4.75,3.906 5.063,4.104 0.313,0.198 10 false 42 5.188,5.76 7.031,5.99 1.844,0.229 10 false *4: w/ Auto Wiper System

PROCEDURE

1.CHECK METER / GAUGE SYSTEM
a.

The circuits that send vehicle speed signals to this system are inspected in the meter section.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>Speed Signal Circuit


b.

While inspecting the meter system, if there is an instruction that indicates to go back to inspecting for the lighting system, proceed to the next step.


Result:
Proceed to
NEXT



NEXT

2.CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - COMBINATION METER ASSEMBLY)
2.CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY - COMBINATION METER ASSEMBLY)
a.

Disconnect the A60 headlight leveling ECU assembly connector.


b.

Disconnect the E43 combination meter assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A60-16 (SPDR) - E43-6 (+S) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

3.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)
a.
E262405C46
1.521,0.396 1.896,0.646 0.375,0.25 2.167,1.25 2.271,0.688 false 0.135,0.135 0.448,0.333 0.313,0.198 10 false *a 1.594,0.427 2.146,0.74 0.552,0.313 10 false E43 2.229,0.49 2.781,0.802 0.552,0.313 10 false +S 1.26,4 1.813,4.313 0.552,0.313 10 false A 2.948,3.698 3.396,4.021 0.448,0.323 10 false GND
*a Component with harness connected
(Combination Meter Assembly)


Check the output waveform.

i.

Remove the combination meter assembly with the connector still connected.


ii.

Connect an oscilloscope to terminal E43-6 (+S) and body ground.


iii.

Turn the ignition switch to ON.


iv.

Check the signal waveform according to the condition(s) in the table below.

Item Condition
Tool setting 5 V/DIV., 20 ms./DIV.
Vehicle condition Wheel being rotated

OK:

The waveform is similar to that shown in the illustration.


HINT:

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.




Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Exterior>LIGHTING (EXT)>AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM>PROBLEM SYMPTOMS TABLE


NG

REPLACE COMBINATION METER ASSEMBLY

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL