Mazda CX-7 2007 Workshop Manual page 1305

ON-BOARD DIAGNOSTIC [ADVANCED KEYLESS SYSTEM]
DTC B2477[ADVANCED KEYLESS SYSTEM]
DTC B2477 Configuration error.
POSSIBLE
• Keyless control module configuration has not been performed correctly
CAUSE
• Keyless control module configuration error.
POSSIBLE
• Malfunction in the keyless control module internal circuit
CAUSE
Diagnostic procedure
STEP INSPECTION
1 PERFORM INSTRUMENT KEYLESS
CONTROL MODULE CONFIGURATION
• Perform keyless control module
configuration.
• Is the DTC displayed?
— M-MDS: B2477
2 VERIFY TROUBLESHOOTING OF DTC B2477
COMPLETED
• Clear the DTC from the memory.
• Is any DTC displayed?
End Of Sie
DTC B1317/B1318[ADVANCED KEYLESS SYSTEM]
DTC B1317 Keyless control module power supply voltage increases (16.1 V or more).
DTC B1318 Keyless control module power supply voltage decreases (less than 9 V).
POSSIBLE
• When the keyless control module power supply voltage is not within 9—16 V
CAUSE
• Open or short circuit in wiring harness between battery and keyless control module
POSSIBLE
• Battery malfunction
CAUSE
• Keyless control module malfunction
Diagnostic procedure
STEP INSPECTION
1 INSPECT FUSE
• Remove the ROOM fuse.
• Is the fuse normal?
2
INSPECT BATTERY
• Measure the battery positive voltage.
• Is the voltage 9 V—16 V?
3 INSPECT WIRING HARNESS BETWEEN
BATTERY AND KEYLESS CONTROL
MODULE
• Turn the ignition switch to the ON position.
• Measure the keyless control module terminal
2A voltage
• Is the voltage 9 V—16 V?
End Of Sie
ACTION
Yes Replace the keyless control module and perform the
resetting procedure for the advanced keyless system when
replacing the keyless control module.
(See 09-14-30 KEYLESS CONTROL MODULE REMOVAL/
INSTALLATION[ADVANCED KEYLESS SYSTEM].)
No Go to the next step.
Yes Go to the applicable DTC inspection.
No DTC troubleshooting completed.
ACTION
Yes Go to the next step.
No Replace the fuse.
Yes Go to the next step.
No The battery has a malfunction.
Inspect the charge/discharge system/
Yes Replace the keyless control module and perform the
resetting procedure for the advanced keyless system when
replacing the keyless control module.
(See 09-14-30 KEYLESS CONTROL MODULE REMOVAL/
INSTALLATION[ADVANCED KEYLESS SYSTEM].)
No DTC troubleshooting completed.
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id0902e1802400
09-02A
09-02A–5