Mazda CX-7 2007 Workshop Manual page 1480

SYMPTOM TROUBLESHOOTING [CAR-NAVIGATION SYSTEM]
STEP
• Inspect the following wiring harnesses
9
between the audio unit and car-navigation
unit.
— Terminal I (24-pin, UART-2)— terminal N
(24-pin, UART-2)
— Terminal E (24-pin, UART-1)— terminal P
(24-pin, UART-1)
• Is there open or short circuit?
• Does system work properly?
10
• Turn the ignition switch to the LOCK position.
11
• Remove the rear view monitor.
• Inspect the rear view monitor (4-pin).
• Is the rear view monitor connector connected
securely?
• Disconnect the rear view monitor connector
12
(4-pin).
• Inspect both rear view monitor connector and
wiring harness-side connector for poor
connection (such as damaged/pulled-out
pins, corrosion).
• Are all the pins normal?
• Turn the ignition switch to the LOCK position.
13
• Remove the audio unit.
• Inspect the audio unit connector (4-pin).
• Is the audio unit connector connected
securely?
• Disconnect the audio unit connector (4-pin).
14
• Inspect both audio unit connector and wiring
harness-side connector for poor connection
(such as damaged/pulled-out pins,
corrosion).
• Are all the pins normal?
• Verify continuity between rear view monitor
15
and audio unit at harness-side connector.
— Rear view monitor terminal A (4-pin,
POWER) and audio unit terminal A (4-pin,
POWER)
— Rear view monitor terminal B (4-pin, P-
GND) and audio unit terminal B (4-pin, P-
GND)
— Rear view monitor terminal C (4-pin, V-
GND) and audio unit terminal D (4-pin, V-
GND)
— Rear view monitor terminal D (4-pin,
CONPOSIDE) and audio unit terminal C
(4-pin, CONPOSIDE)
•
Is there any continuity?
• Does system work properly?
16
End Of Sie
09-03H–4
INSPECTION
Yes Replace the audio unit, then go to the next step.
No Repair or replace the suspect wiring harness.
Yes Troubleshooting is completed.
No Replace the car-navigation unit.
Yes Go to the next step.
No Securely connect the rear view monitor.
Yes Go to the next step.
No If the rear view monitor connector is wrong:
• Replace the rear view monitor.
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
Yes Go to the next step.
No Securely connect the audio unit connector.
Yes Go to the next step.
No If the audio unit connector is wrong:
• Replace the audio unit.
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
Yes Go to the next step.
No Inspect the suspect wiring harness and repair or replace the
wiring harness as necessary.
Yes Troubleshooting is completed.
No Replace the car-navigation unit.
ACTION