Mazda CX-9 2007 Service Highlights page 601

CAN Signal-Chart (MS-CAN)
Signal
Hands-free telephone system-related
information
Audio status display request
Ignition key position
Drive information system data
Buttons status
Vehicle speed
Audio system-related information
RES-related information
Beep sound request
On-Board Diagnostic Function
• The on-board diagnostic function is incorporated into the following module:
— PCM
— TCM
— DSC/RSC HU/CM
— AWD control module
— BCM
— PLG control module
— SAS control module
— Keyless control module
— Instrument cluster
— Audio unit (base module)
— Audio amplifier
— RES unit
— Hands-free telephone unit
— Information display
— Engine off natural vacuum (Engin-off-natural-vacuum is integrated in the PCM)
• This function can narrow down CAN system malfunction locations.
• The on-board diagnostic function consists of the following functions.
— Failure detection function, which detects DTCs malfunctions in CAN system-related parts.
— Memory function, which stores detected.
— Self-malfunction diagnostic function, which indicates system malfunctions using DTCs and warning lights.
• Using the Mazda Modular Diagnostic System (M-MDS), DTCs can be read out and deleted.
• The CAN system has a fail-safe function. When a malfunction occurs in CAN system, the transmission module
sends a warning signal and the receiving module illuminates the warning light.
CONTROL SYSTEM
Multiplex module
Audio unit Audio
(base module) amplifier
IN –
OUT –
OUT –
OUT –
OUT –
OUT –
OUT IN
OUT IN
IN OUT
OUT –
IN IN
OUT: Output (sends signal)
IN: Input (receives signal)
Hands-free
RES unit
telephone unit
– OUT
– IN
– –
– –
– –
– –
– IN
– –
IN IN
IN –
– –
Information
display
–
–
IN
IN
IN
IN
–
–
–
–
OUT
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