Mazda CX-7 2007 Workshop Manual page 1331

ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]
SECURITY LIGHT 11, DTC B1681/P1260[IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]
SECURITY LIGHT: 11
DTC: B1681/P1260
DETECTION CONDITION
POSSIBLE CAUSE
IG1
COIL ANTENNA
WIRING HARNESS-SIDE CONNECTOR
D
C
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?
No detected communication with the coil antenna
• No detected communication with the coil antenna
• Coil antenna malfunction
• Instrument cluster malfunction
• Malfunction in the related wiring harnesses
COIL ANTENNA
B
D
A
C
A
B
INSPECTION
INSTRUMENT CLUSTER
2S
2Q
1E
INSTRUMENT CLUSTER
WIRING HARNESS-SIDE CONNECTOR
2S 2Q
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.
id0902e5800600
ACTION
09-02C–5
09-02C