RM38T0EC _58 Vehicle Interior _112289 METER / GAUGE / DISPLAY _0504968 METER / GAUGE SYSTEM J

METER / GAUGE / DISPLAY  METER / GAUGE SYSTEM  Speed Signal Circuit  


DESCRIPTION

HINT:

This circuit is used for the systems connected to terminal +S. This signal is not used for combination meter assembly operation. Combination meter assembly components such as the speedometer operate using data received via CAN communication. In addition, for some systems, vehicle speed information may be received via CAN communication.


W/ SMART ENTRY AND START SYSTEM


The combination meter assembly receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU (brake actuator assembly) which uses this information to create the vehicle speed signal. The vehicle speed signal is output from the skid control ECU (brake actuator assembly) to the certification ECU (smart key ECU assembly) and then to the combination meter assembly. To create this signal, 12 V is output from terminal SI of the combination meter assembly to the certification ECU (smart key ECU assembly). The pulse signal is created by switching the transistor in the certification ECU (smart key ECU assembly) on and off, making the voltage on the wire drop to 0 V. A similar system is used for the output of this signal from the combination meter assembly via terminal +S. A voltage of 12 V or 5 V is applied to terminal +S from each ECU or relay that is connected to this terminal. The transistor in the combination meter assembly is controlled by the signal from the certification ECU (smart key ECU assembly). When this transistor is turned on, this transistor makes the voltage supplied by the various ECUs (via their respective internal resistors) drop to 0 V. Each ECU connected to terminal +S of the combination meter assembly controls its respective system based on this pulse signal.


W/O SMART ENTRY AND START SYSTEM


The combination meter assembly receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU (brake actuator assembly) which uses this information to create the vehicle speed signal. The vehicle speed signal consists of pulses sent to the combination meter assembly from the skid control ECU (brake actuator assembly). To create this signal, 12 V is output from terminal SI of the combination meter assembly. This voltage is sent to the skid control ECU (brake actuator assembly). The pulse signal is created by switching the transistor in the skid control ECU (brake actuator assembly) on and off, making the voltage on the wire drop to 0 V. A similar system is used for the output of this signal from the combination meter assembly via terminal +S. A voltage of 12 V or 5 V is applied to terminal +S from each ECU or relay that is connected to this terminal. The transistor in the combination meter assembly is controlled by the signal from the skid control ECU (brake actuator assembly). When this transistor is turned on, this transistor makes the voltage supplied by the various ECUs (via their respective internal resistors) drop to 0 V. Each ECU connected to terminal +S of the combination meter assembly controls its respective system based on this pulse signal.


WIRING DIAGRAM

E548776E01
1.125,1.583 1.583,1.781 0.458,0.198 10 false SP1 3.24,2.802 3.698,3 0.458,0.198 10 false SPD 3.708,2.802 4.323,3 0.615,0.198 10 false SPDO 5.229,5.479 7.156,5.854 1.927,0.375 10 false Combination Meter Assembly 0.219,2.458 1.74,2.948 1.521,0.49 10 false Skid Control ECU (Brake Actuator Assembly) 2.958,3.302 4.531,3.844 1.573,0.542 10 false Certification ECU (Smart Key ECU Assembly)*1 2.49,2.708 2.802,2.906 0.313,0.198 10 false *1 4.688,2.719 5,2.917 0.313,0.198 10 false *1 3.594,1.563 3.906,1.76 0.313,0.198 10 false *2 5.573,2.698 5.885,2.896 0.313,0.198 10 false SI 5.573,4.573 5.885,4.771 0.313,0.198 10 false +S 0.656,5.229 1.427,5.427 0.771,0.198 10 false ECM*7 1.344,4.573 1.802,4.771 0.458,0.198 10 false SPD 4.458,6.26 4.771,6.458 0.313,0.198 10 false *3 0.385,6.917 2.083,7.531 1.698,0.615 10 false Radio and Display Receiver Assembly*4 0.177,7.823 2.594,8.156 2.417,0.333 10 false *1: w/ Smart Entry and Start System 0.188,8.146 2.604,8.479 2.417,0.333 10 false *2: w/o Smart Entry and Start System 0.198,8.458 3.135,8.802 2.938,0.344 10 false *3: w/ Navigation System 1.344,6.271 1.802,6.469 0.458,0.198 10 false SPD 5.563,6.281 6.021,6.479 0.458,0.198 10 false SPD 1.521,1.583 2.458,1.813 0.938,0.229 10 false 33 5.25,5.302 5.563,5.5 0.313,0.198 10 false I4 2.917,2.583 3.229,2.781 0.313,0.198 10 false 13 4.271,2.583 4.583,2.781 0.313,0.198 10 false 28 5.313,2.698 5.656,2.958 0.344,0.26 10 false 25 5.385,4.573 5.698,4.771 0.313,0.198 10 false 8 0.656,5.031 1.375,5.354 0.719,0.323 10 false A182 1.75,4.573 2.063,4.771 0.313,0.198 10 false 93 0.396,6.729 0.896,6.927 0.5,0.198 10 false I274 1.729,6.271 2.042,6.469 0.313,0.198 10 false 8 5.323,6.729 5.688,6.927 0.365,0.198 10 false I253 4.208,2.802 4.615,2.979 0.406,0.177 10 false I222 5.385,6.281 5.698,6.479 0.313,0.198 10 false 8 0.25,2.26 0.708,2.458 0.458,0.198 10 false A151 2.854,2.802 3.26,2.979 0.406,0.177 10 false I223 2.563,6.26 2.875,6.458 0.313,0.198 10 false *4 2.677,7.844 5.615,8.188 2.938,0.344 10 false *4: w/o Navigation System 5.323,6.927 7.021,7.542 1.698,0.615 10 false Radio and Display Receiver Assembly*3 2.51,4.573 2.823,4.771 0.313,0.198 10 false *5 2.667,8.167 5.25,8.438 2.583,0.271 10 false *5: for GTMC Made Gasoline Model 5.573,0.573 6.031,0.771 0.458,0.198 10 false IG+ 3.552,0.865 4.927,1.063 1.375,0.198 10 false METER-IGR 5.375,0.573 5.531,0.771 0.156,0.198 10 false 6 4.531,0.125 4.844,0.323 0.313,0.198 10 false *6 4.542,0.594 4.854,0.792 0.313,0.198 10 false *7 0.51,0.24 5.406,0.438 4.896,0.198 10 false from Engine Stop and Start ECU*6 2.667,8.458 4.729,8.719 2.063,0.26 10 false *6: w/ Engine Stop and Start ECU 4.906,7.833 7.146,8.313 2.24,0.479 10 false *7: w/o Engine Stop and Start ECU 1.167,0.688 4.531,0.885 3.365,0.198 10 false from IGR NO. 1 Relay*7

CAUTION / NOTICE / HINT

NOTICE:
·

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

·

When replacing the combination meter assembly, update the ECU security key.

Click hereGeneral>SETUP>WHEN REPLACING OR REMOVING/INSTALLING PARTS>UPDATE ECU SECURITY KEY

·

Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.*1

*1: w/ Smart Entry and Start System




PROCEDURE

1.CHECK COMBINATION METER ASSEMBLY (INPUT WAVEFORM)
a.

Connect the combination meter assembly connector.


b.
E391284C94
1.479,0.438 1.896,0.667 0.417,0.229 2.635,2 2.375,1.5 true 1.615,0.479 2.042,0.708 0.427,0.229 10 false I4 2.656,2.021 2.969,2.219 0.313,0.198 10 false SI 2.948,3.698 3.406,3.896 0.458,0.198 10 false GND 1.281,3.979 1.438,4.177 0.156,0.198 10 false A 0.406,0.479 0.719,0.677 0.313,0.198 10 false *a 0.448,2.458 0.76,2.656 0.313,0.198 10 false *b
*a Component with harness connected
(Combination Meter Assembly)
*b Waveform


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

Item Condition
Tester connection I4-25 (SI) - Body ground
Tool setting 5 V/DIV., 20 ms./DIV.
Condition Ignition switch ON, 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:
Result Proceed to
The measured waveform is similar to that in the illustration A
The measured waveform is not similar to that in the illustration
(Stuck low) 		B
The measured waveform is not similar to that in the illustration
(Stuck high) 		C



A

2.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

B

6.CONFIRM MODEL

C

12.CONFIRM MODEL
2.INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)
a.
E436103C36
1.479,0.438 1.896,0.667 0.417,0.229 2.49,1.292 2.927,0.771 true 1.635,0.479 1.979,0.677 0.344,0.198 10 false I4 2.917,0.615 3.229,0.813 0.313,0.198 10 false +S 2.948,3.698 3.406,3.896 0.458,0.198 10 false GND 1.281,3.979 1.438,4.177 0.156,0.198 10 false A 0.406,0.479 0.719,0.677 0.313,0.198 10 false *a 0.448,2.458 0.76,2.656 0.313,0.198 10 false *b 0.792,3.375 0.948,3.573 0.156,0.198 10 false B
*a Component with harness connected
(Combination Meter Assembly)
*b Waveform


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

Item Condition
Tester connection I4-8 (+S) - Body ground
Tool setting 5 V/DIV., 20 ms./DIV.
Condition Ignition switch ON, wheel being rotated

NOTICE:

Perform the inspection from the back of the connector with the connector connected.


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.

·

The waveform (B) changes depending on the connected ECUs.




Result:
Result Proceed to
The measured waveform is similar to that in the illustration A
The measured waveform is not similar to that in the illustration
(Stuck low) 		B
The measured waveform is not similar to that in the illustration
(Stuck high) 		C



A

3.CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY)

B

4.INSPECT EACH ECU (INTERNAL SHORT)

C

REPLACE COMBINATION METER ASSEMBLY

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


3.CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY)
a.

Disconnect the A182 ECM connector.*1


b.

Disconnect the I253 radio and display receiver assembly connector.*2


c.

Disconnect the I274 radio and display receiver assembly connector.*3


d.

Disconnect the I4 combination meter assembly connector.


e.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A182-93 (SPD) - I4-8 (+S)*1 Always Below 1 Ω
I253-8 (SPD) - I4-8 (+S)*2 Always Below 1 Ω
I274-8 (SPD) - I4-8 (+S)*3 Always Below 1 Ω
A182-93 (SPD)*1, I253-8 (SPD)*2, I274-8 (SPD)*3 or I4-8 (+S) - Body ground Always 10 kΩ or higher


*1: for GTMC Made Gasoline Model

*2: w/ Navigation System

*3: w/o Navigation System



Result:
Proceed to
OK
NG



OK

CHECK THE VOLTAGE AT TERMINAL SPD OF EACH ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.INSPECT EACH ECU (INTERNAL SHORT)
a.

Disconnect one of the connectors below.

NOTICE:

After disconnecting a connector, perform all steps with all other devices connected.


Connector ECU
I253*1 Radio and display receiver assembly
I274*2 Radio and display receiver assembly
A182*3 ECM

*1: w/ Navigation System

*2: w/o Navigation System

*3: for GTMC Made Gasoline Model



b.
E436102C43
1.49,0.177 1.938,0.438 0.448,0.26 2.49,0.979 2.917,0.406 true 1.667,0.229 2.125,0.427 0.458,0.198 10 false I4 2.865,0.26 3.177,0.458 0.313,0.198 10 false +S 0.271,0.313 0.583,0.51 0.313,0.198 10 false *a
*a Component with harness connected
(Combination Meter Assembly)


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

NOTICE:
·

Make sure to perform this inspection with the wheels stopped.

·

Perform the inspection from the back of the connector with the connector connected.



Standard Voltage:
Tester Connection Switch Condition Specified Condition
I4-8 (+S) - Body ground Ignition switch ON 4.5 to 14 V



c.

Repeat steps (a) and (b) for each connected ECU.

HINT:

If the waveform changes to the waveform shown in the illustration after disconnecting a connector, an internal short in the disconnected ECU is suspected.



Result:
Result Proceed to
After performing the inspection procedure for all connectors, the voltage did not change to the specified voltage A
When disconnecting the connector of the radio and display receiver assembly, the voltage changed to the specified voltage B
When disconnecting the connector of the ECM, the voltage changed to the specified voltage C



A

5.CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY)

B

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

Click hereAudio / Visual / Telematics>AUDIO / VIDEO>RADIO RECEIVER>REMOVAL


C

REPLACE ECM

for HEV Model: Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>ECM>REMOVAL

for Gasoline Model: Click hereEngine / Hybrid System>M20A-FKS, M20C-FKS, M20E-FKS (ENGINE CONTROL)>ECM>REMOVAL


5.CHECK HARNESS AND CONNECTOR (EACH ECU - COMBINATION METER ASSEMBLY)
a.

Disconnect the A182 ECM connector.*1


b.

Disconnect the I253 radio and display receiver assembly connector.*2


c.

Disconnect the I274 radio and display receiver assembly connector.*3


d.

Disconnect the I4 combination meter assembly connector.


e.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A182-93 (SPD) - I4-8 (+S)*1 Always Below 1 Ω
I253-8 (SPD) - I4-8 (+S)*2 Always Below 1 Ω
I274-8 (SPD) - I4-8 (+S)*3 Always Below 1 Ω
A182-93 (SPD)*1, I253-8 (SPD)*2, I274-8 (SPD)*3 or I4-8 (+S) - Body ground Always 10 kΩ or higher


*1: for GTMC Made Gasoline Model

*2: w/ Navigation System

*3: w/o Navigation System



Result:
Proceed to
OK
NG



OK

REPLACE COMBINATION METER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CONFIRM MODEL
a.

Choose the model to be inspected.


Result:
Result Proceed to
w/ Smart Entry and Start System A
w/o Smart Entry and Start System B



A

7.CHECK FOR DTC (SMART ENTRY AND START SYSTEM (FOR START FUNCTION))

B

10.CHECK SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (SHORT TO GROUND)
7.CHECK FOR DTC (SMART ENTRY AND START SYSTEM (FOR START FUNCTION))
a.

Connect the I4 combination meter assembly connector.


b.

Check if smart entry and start system (for start function) DTCs are output.

Body Electrical > Power Source Control > Trouble Codes
50001 454

Result:
Result Proceed to
DTCs are not output A
DTCs are output B



A

8.INSPECT COMBINATION METER ASSEMBLY

B

GO TO SMART ENTRY AND START SYSTEM (FOR START FUNCTION)

for HEV Model: Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, HEV Model)>DIAGNOSTIC TROUBLE CODE CHART

for Gasoline Model: Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, Gasoline Model)>DIAGNOSTIC TROUBLE CODE CHART


8.INSPECT COMBINATION METER ASSEMBLY
HINT:

This inspection procedure is performed to check the diode in the combination meter assembly.


a.

Remove the combination meter assembly.

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


b.

Check the internal resistance of the combination meter.

i.

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

Standard Resistance:
Check Terminal Tester Connection Condition Specified Condition
I4-6 (IG+) - I4-25 (SI)
·

Tester (+) → I4-6 (IG+)

·

Tester (-) → I4-25 (SI)


Always A
I4-6 (IG+) - I4-25 (SI)
·

Tester (+) → I4-25 (SI)

·

Tester (-) → I4-6 (IG+)


Always B


OK:

The values of measured value A and measurement B diverge significantly.




Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY)

NG

REPLACE COMBINATION METER ASSEMBLY

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


9.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY)
a.

Disconnect the I4 combination meter assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I222-28 (SPDO) or I4-25 (SI) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.CHECK SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (SHORT TO GROUND)
C498181C05
0.333,0.229 0.75,0.479 0.417,0.25 1.292,1.75 1.125,1 true 0.094,0.104 0.406,0.26 0.313,0.156 10 false *a 0.385,0.271 0.844,0.469 0.458,0.198 10 false A151 1.208,1.771 1.667,1.969 0.458,0.198 10 false SP1
*a Component with harness connected
(Skid Control ECU (Brake Actuator Assembly))


a.

Disconnect the skid control ECU (brake actuator assembly) connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A151-33 (SP1) - Body ground Ignition switch off 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR (for Gasoline Model)>REMOVAL


NG

11.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY)
11.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY)
a.

Disconnect the I4 combination meter assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A151-33 (SP1) or I4-25 (SI) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE COMBINATION METER ASSEMBLY

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.CONFIRM MODEL
a.

Choose the model to be inspected.


Result:
Result Proceed to
w/ Smart Entry and Start System A
w/o Smart Entry and Start System B



A

13.CHECK FOR DTC (SMART ENTRY AND START SYSTEM (FOR START FUNCTION))

B

15.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY)
13.CHECK FOR DTC (SMART ENTRY AND START SYSTEM (FOR START FUNCTION))
a.

Check if smart entry and start system (for start function) DTCs are output.

Body Electrical > Power Source Control > Trouble Codes
50001 454

Result:
Result Proceed to
DTCs are not output A
DTCs are output B



A

14.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY)

B

GO TO SMART ENTRY AND START SYSTEM (FOR START FUNCTION)

for HEV Model: Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, HEV Model)>DIAGNOSTIC TROUBLE CODE CHART

for Gasoline Model: Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, Gasoline Model)>DIAGNOSTIC TROUBLE CODE CHART


14.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - COMBINATION METER ASSEMBLY)
a.

Disconnect the I222 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the I4 combination meter assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I222-28 (SPDO) - I4-25 (SI) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - COMBINATION METER ASSEMBLY)
a.

Disconnect the A151 skid control ECU (brake actuator assembly) connector.


b.

Disconnect the I4 combination meter assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A151-33 (SP1) - I4-25 (SI) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR (for Gasoline Model)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR