Mazda CX-7 2007 Workshop Manual page 1382

DTC B2721[BCM]
DTC B2721 Liftgate ajar output short to ground
DETECTION Short to GND in wiring harness between BCM and liftgate latch switch
CONDITION
• Short to GND in wiring harness between BCM terminal 5P and liftgate latch switch terminal B
POSSIBLE
• Liftgate latch switch malfunction
CAUSE
• BCM malfunction
LIFTGATE LATCH SWITCH WIRING
HARNESS-SIDE CONNECTOR
Diagnostic procedure
STEP
1 INSPECT LIFTGATE LATCH SWITCH
CONNECTOR
• Disconnect the liftgate latch switch
connector.
• Inspect the liftgate latch switch connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
2 INSPECT BCM CONNECTOR
• Disconnect the BCM connector.
• Inspect the BCM connector terminals for
poor connection (such as damaged/pulled-
out pins, and corrosion).
• Is there any malfunction?
3 INSPECT LIFTGATE LATCH SWITCH SIGNAL
CIRCUIT FOR SHORT TO GND
• Inspect for continuity between BCM terminal
5P (wiring harness-side) and body GND.
• Is there continuity?
4 INSPECT LIFTGATE LATCH SWITCH
• Inspect the liftgate latch switch.
(See 09-14-10 LIFTGATE LATCH SWITCH
INSPECTION.)
• Is there any malfunction?
5 VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the BCM memory using
the M-MDS.
• Perform the self-test.
(See 09-02F-26 BCM SELF-TEST[BCM].)
• Is the same DTC present?
End Of Sie
09-02F–20
ON-BOARD DIAGNOSTIC [BCM]
LIFTGATE LATCH
SWITCH
B
A
INSPECTION
BCM
5P
BCM WIRING HARNESS-SIDE
CONNECTOR
5AB 5Y 5V 5S 5P 5M 5J
5AC 5Z 5W 5T 5Q 5N 5K
5AD 5AA 5X 5U 5R 5O
Yes Repair or replace the terminal, then go to Step 5.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 5.
No Go to the next step.
Yes Repair or replace the wiring harness for a possible short to
GND, then go to Step 5.
No Go to the next step.
Yes Replace the liftgate latch switch, then go to the next step.
(See 09-14-10 LIFTGATE LATCH AND LOCK ACTUATOR
REMOVAL/INSTALLATION.)
No Go to the next step.
Yes Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No DTC troubleshooting completed.
id0902f5833300
5G 5D 5A
5H 5E 5B
5L 5I 5F 5C
ACTION