Mazda CX 7. Manual — part 339

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]

09-02D–13

09-02D

Climate Control Unit

Note

• There is no DTC in the climate control unit that determines signal quality between it and the information

display. Due to this, determine the malfunction location using the DTC on the information display.

1. Inspect the display of DTC U0155 using the M-MDS. (See 09-02D-7 DTC TABLE[MULTIPLEX

COMMUNICATION SYSTEM].)

2. Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal

— : Communication error

Car- navigation Unit/Audio Unit (Base Module)

Note

• There is no DTC in the car-navigation unit/audio unit (base module) that determines signal quality

between it and the information display. Due to this, determine the malfunction location using the DTC on
the information display.

1. Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal

— : Communication error

Information display

1. Inspect the display of DTC U0166, U0181 and/or U0184 using the input/output check mode. (See 09-22-15

INFORMATION DISPLAY INPUT/OUTPUT CHECK MODE.)

2. Referring to the following table, determine the malfunctioning part of the CAN system.

×: Normal

— : Communication error

Module

Communication status

Malfunction location

Instrument cluster

Information display

Climate control
unit

— —

• Wiring harness O

• Climate control unit

—

×

• Wiring harness N

• Instrument cluster

×

—

• Wiring harness Q

• Wiring harness S

• Information display

Module

Communication status

Malfunction location

Information display

Car-navigation unit
Audio unit (base module)

—

• Wiring harness P

• Wiring harness Q

• Wiring harness S

• Car-navigation unit

• Audio unit (base module)

• Information display

Module

Communication status

Malfunction location

Climate control unit

Car-navigation unit

Audio unit (base module)

Instrument cluster

Information
display

— — —

• Wiring harness Q

• Wiring harness S

• Information display

—

×

×

• Wiring harness O

• Climate control unit

×

—

×

• Wiring harness P

• Car-navigation unit

• Audio unit (base

module)

×

×

—

• Wiring harness N

• Instrument cluster

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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]

09-02D–14

Repair Procedure

1. Inspect the connector of malfunctioning module.

• If there is any malfunction, repair or replace the connector.

2. Inspect the malfunctioning wiring harnesses as follow:

• If there is any malfunction, repair or replace the wiring harnesses.

• If there is no malfunction, replace the malfunctioning module.

— Short to GND

— Short to power supply

— Twisted pair short each other

— Open circuit

3. Make sure to reconnect all disconnected connectors.
4. Clear the CAN system related DTCs using the M-MDS.
5. Verify if the CAN system related DTCs are displayed using the M-MDS.

• If the same following DTCs are present, replace the malfunctioning module.

— U0073 (PCM, TCM, DSC HU/CM, AWD control module, BCM, SAS control module, keyless control

module, instrument cluster)

— U0516 (Climate control unit)

— U2516 (Instrument cluster, information display)

— 16:Er12 (Audio unit (base module))

• If other DTC is present, perform the appropriate DTC inspection. (See 09-02D-7 DTC TABLE[MULTIPLEX

COMMUNICATION SYSTEM].)

End Of Sie

DTC U0073[MULTIPLEX COMMUNICATION SYSTEM]

id0902e6824800

DTC

U0073

PCM
TCM
DSC HU/CM
AWD control module
BCM
SAS control module
Keyless control module
Instrument cluster

CAN system communication error

DETECTION

CONDITION

Warning
• Detection conditions are for understanding the DTC outline before performing an inspection.

Performing an inspection according to only detection conditions may cause injury due to
operating error, or damage the system. When performing an inspection, always follow the
inspection procedure.

• CAN system related harness malfunction

• Related module communication error

POSSIBLE

CAUSE

• Open or short circuit in wiring harness

• Malfunction of connectors between PCM, TCM, DSC HU/CM, AWD control module, BCM, SAS control

module, keyless control module, instrument cluster

• PCM malfunction

• TCM malfunction

• DSC HU/CM malfunction

• AWD control module malfunction

• BCM malfunction

• SAS control module malfunction

• Keyless control module malfunction

• Instrument cluster malfunction

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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]

09-02D–15

09-02D

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT CAN SYSTEM-RELATED DTC

• Are any DTCs other than the following

displayed?
— U0073

Yes

Determine malfunctioning part in CAN system.
(See 09-02D-8 PROCEDURES FOR DETERMINING THE
LOCATION OF A MALFUNCTION[MULTIPLEX
COMMUNICATION SYSTEM])

No

Go to the next step.

2

INSPECT CONNECTOR

• Inspect the connector of the module that

outputs the DTC.

• Is it normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 4.

3

INSPECT WIRING HARNESSES

• Inspect for the following malfunctioning

wiring harnesses:

— Short to GND

— Short to power supply

— Twisted pair short each other

— Open circuit

• Is there any malfunction?

Yes

Repair or replace the wiring harness, then go to the next
step.

No

Go to the next step.

4

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear the DTC using the M-MDS.

• Is the same DTC present?

Yes

Replace the module that outputs the DTC, then retry this
step.

No

Troubleshooting completed.

DTC

U0073

PCM
TCM
DSC HU/CM
AWD control module
BCM
SAS control module
Keyless control module
Instrument cluster

CAN system communication error

F

E

2R

2T

3X

3W

5L

5I

DLC-2

1AI

1AM

3X

3W

G

H

PCM

TCM

BCM

BCM

X

W

DSC HU/CM

KEYLESS
CONTROL
MODULE

2E

2F

SAS
CONTROL
MODULE

AWD
CNTROL
MODULE

A14

A6

INSTRUMENT
CLUSTER

FRONT HARNESS

EMISSION HARNESS

INSTRUMENT PANEL
HARNESS

:

:

CAN_H

CAN_L

REAR HARNESS

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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]

09-02D–16

DTC U0516, U2516, 16:Er12[MULTIPLEX COMMUNICATION SYSTEM]

id0902e6837100

Diagnostic procedure

End Of Sie

DTC

U0516

Climate control unit

CAN system communication error

U2516

Information display
Instrument cluster

16:Er12

Audio unit (base
module)

DETECTION

CONDITION

Warning
• Detection conditions are for understanding the DTC outline before performing an inspection.

Performing an inspection according to only detection conditions may cause injury due to
operating error, or damage the system. When performing an inspection, always follow the
inspection procedure.

• CAN system related harness malfunction

• Related module communication error

POSSIBLE

CAUSE

• Open or short circuit in wiring harness

• Malfunction of connectors between information display, audio unit (base module), climate control unit

and instrument cluster

• Climate control unit malfunction

• Information display malfunction

• Audio unit (base module) malfunction

• Instrument cluster malfunction

STEP

INSPECTION

ACTION

1

INSPECT CAN SYSTEM-RELATED DTC

• Are any DTCs other than the following

displayed?
— U0516

— U2516

— 16:Er12

Yes

Determine malfunctioning part in CAN system.
(See 09-02D-8 PROCEDURES FOR DETERMINING THE
LOCATION OF A MALFUNCTION[MULTIPLEX
COMMUNICATION SYSTEM].)

No

Go to the next step.

2

INSPECT CONNECTOR

• Inspect the connector of the module that

outputs the DTC.

• Is it normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 4.

3

INSPECT WIRING HARNESSES

• Inspect for the following malfunctioning

wiring harnesses:
— Short to GND

— Short to power supply

— Twisted pair short each other

— Open circuit

• Is there any malfunction?

Yes

Repair or replace the wiring harness, then go to the next
step.

No

Go to the next step.

4

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear the DTC using the M-MDS.

• Is the same DTC present?

Yes

Replace the module that outputs the DTC, then retry this
step.

No

Troubleshooting completed.

:

:

2X

2V

B

A

L

K

2O

2P

1O

1Q

CAN_H

CAN_L

DLC-2

J

I

INSTRUMENT
CLUSTER

CLIMATE
CONTROL UNIT

AUDIO
AMPLIFIER

INFORMATION
DISPLAY

AUDIO UNIT
(BASE MODULE)

INSTRUMENT PANEL
HARNESS

REAR HARNESS

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