Mazda CX-7 2007 Workshop Manual page 1356

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
DTC U0516, U2516, 16:Er12[MULTIPLEX COMMUNICATION SYSTEM]
U0516 Climate control unit
Information display
U2516
DTC Instrument cluster
Audio unit (base
16:Er12
module)
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
DETECTION
operating error, or damage the system. When performing an inspection, always follow the
CONDITION
inspection procedure.
• CAN system related harness malfunction
• Related module communication error
• Open or short circuit in wiring harness
• Malfunction of connectors between information display, audio unit (base module), climate control unit
and instrument cluster
POSSIBLE
• Climate control unit malfunction
CAUSE
• Information display malfunction
• Audio unit (base module) malfunction
• Instrument cluster malfunction
2V
INSTRUMENT
CLUSTER
2X
INSTRUMENT PANEL
HARNESS
Diagnostic procedure
STEP
1 INSPECT CAN SYSTEM-RELATED DTC
• Are any DTCs other than the following
displayed?
— U0516
— U2516
— 16:Er12
2 INSPECT CONNECTOR
• Inspect the connector of the module that
outputs the DTC.
• Is it normal?
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?
4 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC using the M-MDS.
• Is the same DTC present?
End Of Sie
09-02D–16
CAN system communication error
AUDIO
REAR HARNESS
AMPLIFIER
2O
2P
K
L
DLC-2
INSPECTION
CLIMATE
CONTROL UNIT
A
B
1O 1Q
AUDIO UNIT
(BASE MODULE)
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.
Yes Go to the next step.
No Repair or replace the connector, then go to Step 4.
Yes Repair or replace the wiring harness, then go to the next
step.
No Go to the next step.
Yes Replace the module that outputs the DTC, then retry this
step.
No Troubleshooting completed.
id0902e6837100
J
INFORMATION
DISPLAY
I
:
CAN_H
: CAN_L
ACTION