Mazda CX-7 2007 Workshop Manual page 1310

ON-BOARD DIAGNOSTIC [ADVANCED KEYLESS SYSTEM]
DTC B1131[ADVANCED KEYLESS SYSTEM]
DTC B1131 Keyless antenna (exterior, rear)
DETECTION
• Keyless antenna dose not operated.
CONDITION
• Keyless antenna (exterior, rear) malfunction
POSSIBLE
• Open or short circuit in wiring harness between keyless control module and keyless antenna
CAUSE
• Keyless control module malfunction
Diagnostic procedure
STEP INSPECTION
1 INSPECT COMMUNICATION CIRCUIT FOR
CONTINUITY
• Disconnect keyless control module
connector and keyless antenna (exterior,
rear) connector.
• Inspect the continuity between the following
connector terminals.
— keyless control module: 1E—keyless
antenna: A
— keyless control module: 1F—keyless
antenna: B
• Is there continuity?
2 INSPECT KEYLESS CONTROL MODULE
• Turn the ignition switch to the ON position.
• Is the DTC displayed?
— M-MDS: B1131
End Of Sie
DTC B1129[ADVANCED KEYLESS SYSTEM]
DTC B1129 Keyless antenna (interior, middle)
DETECTION
• Keyless antenna dose not operated.
CONDITION
• Keyless antenna (interior, middle) malfunction
POSSIBLE
• Open or short circuit in wiring harness between keyless control module and keyless antenna
CAUSE
• Keyless control module malfunction
Diagnostic procedure
STEP INSPECTION
1 INSPECT COMMUNICATION CIRCUIT FOR
CONTINUITY
• Disconnect keyless control module
connector and keyless antenna (interior,
middle) connector.
• Inspect the continuity between the following
connector terminals.
— keyless control module: 1M—keyless
antenna: A
— keyless control module: 1N—keyless
antenna: B
• Is there continuity?
2 INSPECT KEYLESS CONTROL MODULE
• Turn the ignition switch to the ON position.
• Is the DTC displayed?
— M-MDS: B1129
End Of Sie
09-02A–10
ACTION
Yes Replace keyless antenna (exterior, rear).
(See 09-14-37 KEYLESS ANTENNA REMOVAL/
INSTALLATION[ADVANCED KEYLESS SYSTEM].)
Go to next step.
No Repair the wiring harness between the keyless antenna
(exterior, rear) and keyless control module.
Go to next step.
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.
ACTION
Yes Replace keyless antenna (interior, middle).
(See 09-14-37 KEYLESS ANTENNA REMOVAL/
INSTALLATION[ADVANCED KEYLESS SYSTEM].)
Go to next step.
No Repair the wiring harness between the keyless antenna
(interior, middle) and keyless control module.
Go to next step.
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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