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 Navigation ECU and Combination Meter

DESCRIPTION

The navigation ECU receives a 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 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

1.542,0.271 2.688,0.531 1.146,0.26 10 false to Other Systems 2.115,1.406 2.427,1.604 0.313,0.198 10 false +S 2.417,1.302 2.729,1.5 0.313,0.198 10 false 36 4.573,1.313 4.885,1.51 0.313,0.198 10 false 9 4.833,1.427 5.281,1.646 0.448,0.219 10 false SPD 4.833,2.083 5.313,2.292 0.479,0.208 10 false O9 4.833,2.24 5.927,2.615 1.094,0.375 10 false Navigation ECU 1.01,2.073 1.781,2.271 0.771,0.198 10 false N22 1.01,2.24 2.979,2.594 1.969,0.354 10 false Combination Meter Assembly

PROCEDURE

1.CHECK 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 1.583,0.26 1.896,0.458 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>REMOVAL201902,201906,_58,_078337,_0380006,RM100000001FR91,201906,999999,_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.CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - COMBINATION METER ASSEMBLY)

GO TO METER / GAUGE SYSTEM

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>Speed Signal Circuit201902,201906,_58,_078337,_0379907,RM100000001FQUK,201906,202107,_58,_078337,_0379907,RM100000001ITFD,202107,999999,_58,_078337,_0379907,RM100000001Y27X,

2.CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - COMBINATION METER ASSEMBLY)

Disconnect the O9 navigation ECU connector.

Disconnect the N22 combination meter assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O9-9 (SPD) - N22-36 (+S)	Always	Below 1 Ω

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 TABLE201902,201906,_56,_078379,_0380999,RM100000001FWSB,201906,202006,_56,_078379,_0380999,RM100000001IG06,202006,202107,_56,_078379,_0380999,RM100000001P0XF,202107,999999,_56,_078379,_0380999,RM100000001Y0CX,

REPAIR OR REPLACE HARNESS OR CONNECTOR