RM35X0E _56 Audio / Visual / Telematics _078379 NAVIGATION / MULTI INFO DISPLAY _0380999 NAVIGATION SYSTEM J

NAVIGATION / MULTI INFO DISPLAY NAVIGATION SYSTEM Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter

DESCRIPTION

The stereo component amplifier 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 systems 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

2.427,1.375 2.885,1.573 0.458,0.198 10 false 36 2.146,1.479 2.604,1.677 0.458,0.198 10 false +S 4.563,1.385 5.021,1.583 0.458,0.198 10 false 11 4.833,1.51 5.292,1.708 0.458,0.198 10 false SPD 4.708,2.167 5.167,2.365 0.458,0.198 10 false N169 4.719,2.323 7.115,2.698 2.396,0.375 10 false Stereo Component Amplifier Assembly 1.01,2.188 1.469,2.385 0.458,0.198 10 false N22 1.01,2.365 3.031,2.708 2.021,0.344 10 false Combination Meter Assembly 1.594,0.354 2.875,0.667 1.281,0.313 10 false to Other Systems

PROCEDURE

1.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

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 1.583,0.271 1.896,0.469 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.

Remove the combination meter assembly with the connector(s) still connected.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL201906,999999,_58,_078337,_0380006,RM100000001IHHE,

ii.

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

iii.

Turn the ignition switch to ON.

iv.

Turn a wheel slowly.

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

2.INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (INPUT WAVEFORM)

GO TO METER / GAUGE SYSTEM

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>Speed Signal Circuit201906,202107,_58,_078337,_0379907,RM100000001ITFD,202107,999999,_58,_078337,_0379907,RM100000001Y27X,

2.INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (INPUT WAVEFORM)

Check the input waveform.

1.583,0.417 2,0.667 0.417,0.25 0.865,0.885 1.01,0.885 1.01,0.885 1.365,1.229 true 0.198,0.198 0.51,0.396 0.313,0.198 10 false *a 1.635,0.458 2.052,0.688 0.417,0.229 10 false N169 0.542,0.813 1.01,1.052 0.469,0.24 10 false SPD 4.573,1.813 4.885,2.01 0.313,0.198 10 false A 5.969,1.563 6.469,1.854 0.5,0.292 10 false GND

Component with harness connected
(Stereo Component Amplifier Assembly)

Remove the stereo component amplifier assembly with the connector(s) still connected.

Click hereAudio / Visual / Telematics>AUDIO / VIDEO>STEREO COMPONENT AMPLIFIER>REMOVAL201906,999999,_56,_078377,_0396428,RM100000001IHI1,

ii.

Connect an oscilloscope to terminal N169-11 (SPD) and body ground.

iii.

Turn the ignition switch to ON.

iv.

Turn a wheel slowly.

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

Item	Condition
Measurement terminal	N169-11 (SPD) - 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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereAudio / Visual / Telematics>NAVIGATION / MULTI INFO DISPLAY>NAVIGATION SYSTEM>PROBLEM SYMPTOMS TABLE201906,202006,_56,_078379,_0380999,RM100000001IG06,202006,202107,_56,_078379,_0380999,RM100000001P0XF,202107,999999,_56,_078379,_0380999,RM100000001Y0CX,

REPAIR OR REPLACE HARNESS OR CONNECTOR