Mazda CX-7 2007 Workshop Manual page 1308

ON-BOARD DIAGNOSTIC [ADVANCED KEYLESS SYSTEM]
DTC U0214[ADVANCED KEYLESS SYSTEM]
DTC U0214 Keyless receiver.
DETECTION
• When the keyless receiver power supply voltage is less than 7.5 V.
CONDITION
• Keyless receiver malfunction
POSSIBLE
• Open or short circuit in wiring harness between keyless control module and keyless receiver
CAUSE
• Keyless control module malfunction
Diagnostic procedure
STEP INSPECTION
1 INSPECT WIRING HARNESS BETWEEN
KEYLESS RECEIVER AND GROUND
• Disconnect keyless receiver connector.
• Is there continuity between keyless receiver
terminal E and ground?
2 INSPECT COMMUNICATION CIRCUIT FOR
CONTINUITY
• Disconnect keyless control module
connector and keyless receiver connector.
• Inspect the continuity between the following
connector terminals/
— keyless control module: 3A—keyless
receiver: A
— keyless control module: 3C—keyless
receiver: C
• Is voltage more than 7.5 V?
3 INSPECT KEYLESS RECEIVER POWER
SUPPLY CIRCUIT
• Turn the ignition switch to the ON position.
• Measure voltage at terminal 3A of keyless
control module connector.
• Is voltage more than 7.5 V?
End Of Sie
DTC B1133[ADVANCED KEYLESS SYSTEM]
DTC B1133 Keyless antenna (exterior, LF)
DETECTION
• Keyless antenna dose not operated.
CONDITION
• Keyless antenna (exterior, LF) 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, LF)
connector.
• Inspect the continuity between the following
connector terminals.
— keyless control module: 1A—keyless
antenna: A
— keyless control module: 1B—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: B1133
09-02A–8
ACTION
Yes Go to next step.
No
Repair the wiring harness between the keyless receiver and
ground.
Go to next step.
Yes Go to next step.
No Repair the wiring harness between the keyless receiver and
ground.
Go to next step.
Yes Replace keyless receiver.
(See 09-14-36 KEYLESS RECEIVER REMOVAL/
INSTALLATION.)
No 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].)
ACTION
Yes Replace keyless antenna (driver's door).
(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, LF) 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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