Mazda CX-7 2007 Workshop Manual page 1317

[IMMOBILIZER SYSTEM (ADVANCED KEYLESS SYSTEM)]
SECURITY LIGHT 11, DTC B1681/P1260[IMMOBILIZER SYSTEM (ADVANCED KEYLESS SYSTEM)]
SECURITY LIGHT: 11
DTC: B1681/P1260
DETECTION CONDITION
POSSIBLE CAUSE
IG1
Diagnostic Procedure
STEP
1 INSPECT COIL ANTENNA POWER SUPPLY
SYSTEM
• Disconnect the coil antenna connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at coil antenna terminal D.
— Is the voltage 8 V or more?
2 INSPECT WIRING HARNESS BETWEEN
COIL ANTENNA AND GROUND
• Turn the ignition switch to the LOCK position.
• Inspect the wiring harness between coil antenna
terminal C and ground for the following:
— Short to power supply
— Open circuit
• Is the wiring harness normal?
3 INSPECT COIL ANTENNA INPUT SIGNAL
CIRCUIT
• Connect the coil antenna connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at coil antenna terminal B.
— Is the voltage 8 V or more?
4 INSPECT COIL ANTENNA INPUT SIGNAL
CIRCUIT
• Turn the ignition switch to the LOCK position.
• Disconnect the keyless control module
connector.
• Turn the ignition switch to the ON position.
• Measure the voltage at keyless control module
terminal 3U.
— Is the voltage 8 V or more?
5 INSPECT COMMUNICATION CIRCUIT
(INPUT) FOR CONTINUITY
• Turn the ignition switch to the LOCK position.
• Is there continuity between coil antenna terminal
B and keyless control module terminal 3U?
ON-BOARD DIAGNOSTIC
No detected communication with the coil antenna
• No detected communication with the coil antenna
• Coil antenna malfunction
• Instrument keyless control module
• Malfunction in the related wiring harnesses
COIL ANTENNA
B
D
A
C
INSPECTION
KEYLESS CONTROL
MODULE
3U
3V
2B
Yes Go to the next step.
No Repair the wiring harness.
Yes Go to the next step.
No Repair the wiring harness.
Yes Go to Step 7.
No Go to the next step.
Yes Replace the keyless control module and perform the
resetting procedure for the immobilizer system when
replacing the keyless control module.
(See 09-14-30 KEYLESS CONTROL MODULE
REMOVAL/INSTALLATION[ADVANCED KEYLESS
SYSTEM].)
(See 09-14-11 IMMOBILIZER SYSTEM COMPONENT
REPLACEMENT/KEY ADDITION AND
CLEARING[ADVANCED KEYLESS SYSTEM].)
No Go to the next step.
Yes Go to the next step.
No Repair the wiring harness.
id0902e3800600
ACTION
09-02B–5
09-02B