Mazda CX-9 2007 Service Highlights page 605

Flowchart
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?
Determine the malfunctioning part of the CAN system.
END
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).
Module
PCM
DSC/RSC HU/CM
Instrument cluster
PCM
: TWISTED PAIR
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
• 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
CONTROL SYSTEM
Yes
Displayed DTC
U0155 Communication error between PCM and instrument cluster
–
U0100 Communication error between instrument cluster and PCM
DSC/RSC HU/CM
COMMUNICATION
ERROR
No
END
Probable malfunction location
–
NORMAL
INSTRUMENT CLUSTER
DLC-2
ac9uun00000374
09-40
ac9uun00000373
id094000101400
09-40–13