RM35X0E _56 Audio / Visual / Telematics _078377 AUDIO / VIDEO _0383454 AUDIO AND VISUAL SYSTEM(for Radio Receiver Type) J

AUDIO / VIDEO  AUDIO AND VISUAL SYSTEM(for Radio Receiver Type)  Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter  


DESCRIPTION

The radio receiver assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function.

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 diagram below will not operate normally.



WIRING DIAGRAM

E365516E33
1.031,2.281 2.99,2.531 1.958,0.25 10 false Combination Meter Assembly 1.052,2.135 1.51,2.333 0.458,0.198 10 false N22 4.823,1.49 5.24,1.75 0.417,0.26 10 false SPD 4.427,2.302 6.813,2.625 2.385,0.323 10 false Radio Receiver Assembly 4.438,2.146 4.896,2.344 0.458,0.198 10 false O12 2.125,1.49 2.542,1.75 0.417,0.26 10 false +S 2.458,1.375 2.875,1.635 0.417,0.26 10 false 36 4.542,1.375 4.958,1.635 0.417,0.26 10 false 17 1.604,0.344 4.052,0.542 2.448,0.198 10 false to Other Systems

CAUTION / NOTICE / HINT

NOTICE:

The audio and visual system troubleshooting procedure is based on the premise that the meter / gauge system is operating normally. Check the meter / gauge system first before troubleshooting the audio and visual system.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING


PROCEDURE

1.CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)
a.
E396774C16
1.448,0.188 1.948,0.5 0.5,0.313 0.698,2.052 1.083,1.521 true 0.573,2.063 0.885,2.26 0.313,0.198 10 false S+ 0.156,0.125 0.469,0.323 0.313,0.198 10 false *a 1.573,0.271 1.885,0.469 0.313,0.198 10 false N22 2.802,3.604 3.26,3.802 0.458,0.198 10 false GND 1.125,3.875 1.344,4.094 0.219,0.219 10 false A
*a Component with harness connected
(Combination Meter Assembly)


Check the output waveform.

i.

Remove the combination meter assembly with the connector still connected.

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


ii.

Connect an oscilloscope to terminal N22-36 (+S) and body ground.


iii.

Turn the ignition switch to ON.


iv.

Turn a wheel slowly.


v.

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

Item Condition
Measurement terminal N22-36 (+S) - Body ground
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

2.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)

NG

GO TO METER / GAUGE SYSTEM

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


2.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - COMBINATION METER ASSEMBLY)
a.

Disconnect the O12 radio receiver assembly connector.


b.

Disconnect the N22 combination meter assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
O12-17 (SPD) - N22-36 (+S) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereAudio / Visual / Telematics>AUDIO / VIDEO>AUDIO AND VISUAL SYSTEM (for Radio Receiver Type)>PROBLEM SYMPTOMS TABLE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR