Mazda 2007 CX-9, Service Highlights, Page: 605 / 614

CONTROL SYSTEM
09-40–13
09-40
Flowchart
Example (PCM-related communication error)
1. DTCs for the PCM, DSC/RSC HU/CM and instrument cluster can be verified using the Mazda Modular
Diagnostic System (M-MDS).
2. If there is a communication error between the instrument cluster and PCM, even if the communication between
the DSC/RSC HU/CM and the instrument cluster is normal, it is probable that there is a malfunction in the PCM
or PCM-related wiring harnesses.
End Of Sie
NG: POWER SUPPLY SYSTEM
BODY CONTROL MODULE (BCM) OUTLINE
id094000101400
•
The following relays are built into the BCM:
—
Door lock/unlock relays
•
The BCM controls the following systems:
—
Interior lighting system
—
Turn and hazard system
—
Rear wiper/washer system
—
Power door lock system
—
Keyless entry system
—
Steering angle detection
End Of Sie
START
Verify that DTCs are displayed for PCM, TCM, DSC/RSC HU/CM, BCM, AWD control module, PLG
control module, SAS control module, keyless control module, audio unit (base module), audio amplifier,
RES unit, hands free tellphone, information display, and instrument cluster.
Are any DTCs display?
Yes
No
END
Determine the malfunctioning part of the CAN system.
END
ac9uun00000374
Module Displayed DTC Probable malfunction location
PCM U0155 Communication error between PCM and instrument cluster
DSC/RSC HU/CM – –
Instrument cluster U0100 Communication error between instrument cluster and PCM
DLC-2
PCM
: TWISTED PAIR
INSTRUMENT CLUSTER
DSC/RSC HU/CM
NORMAL
COMMUNICATION
ERROR
ac9uun00000373
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