Mazda CX-7 2007 Workshop Manual page 1444

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
NO.7 ALC FUNCTION IS INOPERATIVE[ENTIRE AUDIO SYSTEM] End Of Sie
7 ALC function is inoperative/Possible DTC: 16:Er12
Troubleshooting hints
• Audio unit malfunction
• CAN signal wiring harness malfunction
• Open or short circuit in vehicle speed signal wiring harness (e. g., instrument cluster)
Note
• Inspect the ALC function while driving the vehicle with playing the CD, etc.
Diagnostic procedure
STEP
• Turn the ALC function to ON.
1
• Inspect the ALC function operation when
driving the vehicle at ALC level 3.
• Does the ALC system operate properly?
• Retrieve the DTCs from all vehicle modules
2
using the M-MDS or equivalent.
• Is there the following DTC displayed?
— Vehicle speed signal wiring harness
— CAN signal wiring harness
End Of Sie
NO.8 AUDIO PILOT FUNCTION IS INOPERATIVE[ENTIRE AUDIO SYSTEM]
8 Audio Pilot function is inoperative
Troubleshooting hints
• Audio amplifier malfunction
• Open or short circuit in Mic unit signal wiring harness
• Open or short circuit in Audio Pilot signal wiring harness
Diagnostic procedure
STEP
• Turn the Audio Pilot function on.
1
• Inspect the Audio Pilot function operation
while driving the vehicle.
• Does the Audio Pilot system operation
properly?
• Inspect the connection of the audio amplifier
2
connector (40-pin, Mic unit signal).
• Inspect both the audio amplifier wiring
harness-side connector terminal 3E and 3F
(40-pin) for a poor connection (such as
damaged/pulled-out pins, corrosion).
• Are all the pins normal?
• Inspect the connection of the Mic unit
3
connector (2-pin).
• Inspect the Mic unit wiring harness-side
connector terminal A and B (2-pin) for poor
connection (such as damaged/pulled-out
pins, corrosion).
• Are all pins normal?
• Inspect continuity between the following
4
terminals of the audio amplifier connector
and Mic unit connector.
— Terminal 2A (40-pin)— Terminal A (Mic
unit)
— Terminal 2B (40-pin)— Terminal B (Mic
unit)
• Is there continuity?
• Retrieve the DTCs from all vehicle modules
5
using the M-MDS or equivalent.
• Is there the following DTC displayed?
— Vehicle speed signal wiring harness
— CAN communication wiring harness
09-03D–16
INSPECTION
INSPECTION
Yes The system is normal. Explains the ALC function to the
customer.
No Go to the next step.
Yes Go to the appropriate DTC inspection.
No Replace the audio unit.
Yes The system is normal.
Explain the Audio Pilot function to the customer.
No Go to the next step.
Yes Repair or replace the pins and/or the connector.
No Go to the next step.
Yes Repair or replace the pins and/or the connector.
No Go to the next step.
Yes Inspect for open or short circuit.
Go to the next step.
No Repair or replace for open circuit.
Yes Go to the appropriate DTC inspection.
No Replace the audio amplifier.
(See 09-20-6 AUDIO AMPLIFIER REMOVAL/
INSTALLATION.)
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