Mazda CX 7. Manual — part 345
![](/vehicles/rke/eetan/dot/gormeg.png)
ON-BOARD DIAGNOSTIC [BCM]
09-02F–15
09-02F
End Of Sie
DTC B1873[BCM]
id0902f5832200
Diagnostic procedure
End Of Sie
DTC B1873
Hazard switch input circuit short to ground
DETECTION
CONDITION
Short to GND in wiring harness between BCM and hazard warning switch
POSSIBLE
CAUSE
• Short to GND in wiring harness between BCM terminal 3J and hazard warning switch terminal C
• Hazard warning switch malfunction
• BCM malfunction
STEP
INSPECTION
ACTION
1
INSPECT HAZARD WARNING SWITCH
CONNECTOR
• Disconnect the hazard warning switch
connector.
• Inspect the hazard warning switch connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
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?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
3
INSPECT HAZARD WARNING SWITCH
SIGNAL CIRCUIT FOR SHORT TO GND
• Inspect for continuity between BCM terminal
3J (wiring harness-side) and body GND.
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to
GND, then go to Step 5.
No
Go to the next step.
4
INSPECT HAZARD WARNING SWITCH
• Inspect the hazard warning switch.
(See 09-18-15 HAZARD WARNING
SWITCH INSPECTION.)
• Is there any malfunction?
Yes
Replace the hazard warning switch, then go to the next
step.
(See 09-18-15 HAZARD WARNING SWITCH REMOVAL/
INSTALLATION.)
No
Go to the next step.
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?
Yes
Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.
C
HAZARD WARNING SWITCH
BCM
3J
B
HAZARD WARNING SWITCH WIRING
HARNESS-SIDE CONNECTOR
BCM WIRING HARNESS-SIDE
CONNECTOR
3E
3G
3I
3K
3M
3O
3A
3C
3N
3L
3P
3H
3D
3B
3F
3J
3Q
3R
3S
3T
3U
3V
3W
3X
A
C
D
B
1871-1U-06B(09-02F).fm 15 ページ 2006年3月15日 水曜日 午前11時41分
![](/vehicles/rke/eetan/dot/dorous.png)
ON-BOARD DIAGNOSTIC [BCM]
09-02F–16
DTC B2175[BCM]
id0902f5832400
Diagnostic procedure
End Of Sie
DTC B2175
A/C request switch circuit short to ground
DETECTION
CONDITION
Short to GND in wiring harness between BCM and climate control unit (A/C ON request)
POSSIBLE
CAUSE
• Short to GND in wiring harness between BCM terminal 3V and climate control unit terminal J
• Climate control unit malfunction
• BCM malfunction
STEP
INSPECTION
ACTION
1
INSPECT CLIMATE CONTROL UNIT
CONNECTOR
• Disconnect the climate control unit
connector.
• Inspect the climate control unit connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
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?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
3
INSPECT CLIMATE CONTROL UNIT SIGNAL
CIRCUIT FOR SHORT TO GND
• Inspect for continuity between BCM terminal
3V (wiring harness-side) and body GND.
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to
GND, then go to Step 5.
No
Go to the next step.
4
INSPECT CLIMATE CONTROL UNIT
• Inspect the climate control unit.
(See 07-40-16 CLIMATE CONTROL UNIT
INSPECTION [MANUAL AIR
CONDITIONER].)
• Is there any malfunction?
Yes
Replace the climate control unit, then go to the next step.
(See 07-40-25 CLIMATE CONTROL UNIT REMOVAL
[MANUAL AIR CONDITIONER], 07-40-26 CLIMATE
CONTROL UNIT INSTALLATION [MANUAL AIR
CONDITIONER].)
No
Go to the next step.
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?
Yes
Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.
3V
J
CLIMATE CONTROL UNIT
BCM
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
S
R
U
V
W
X
CLIMATE CONTROL UNIT WIRING
HARNESS-SIDE CONNECTOR
BCM WIRING HARNESS-SIDE
CONNECTOR
Q
T
3E
3G
3I
3K
3M
3O
3A
3C
3N
3L
3P
3H
3D
3B
3F
3J
3Q
3R
3S
3T
3U
3V
3W
3X
1871-1U-06B(09-02F).fm 16 ページ 2006年3月15日 水曜日 午前11時41分
![](/vehicles/rke/eetan/dot/peald.png)
ON-BOARD DIAGNOSTIC [BCM]
09-02F–17
09-02F
DTC B2218[BCM]
id0902f5839700
Diagnostic procedure
DTC B2218
Door lock switch circuit short to ground
DETECTION
CONDITION
Short to GND in wiring harness between BCM and door lock switches
POSSIBLE
CAUSE
• Short to GND in wiring harness between BCM terminal 5M and door lock switch (driver-side) terminal
C
• Short to GND in wiring harness between BCM terminal 5N and door lock switch (passenger-side)
terminal C
• Door lock switches malfunction
• BCM malfunction
STEP
INSPECTION
ACTION
1
INSPECT DOOR LOCK SWITCH
CONNECTOR
• Disconnect the door lock switch connector.
• Inspect the door lock switch connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
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?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
3
INSPECT DOOR LOCK SWITCH SIGNAL
CIRCUIT FOR SHORT TO GND
• Inspect for continuity between BCM terminal
5M, 5N (wiring harness-side) and body GND.
• Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to
GND, then go to Step 5.
No
Go to the next step.
4
INSPECT DOOR LOCK SWITCH
• Inspect the door lock switch.
(See 09-14-8 DOOR LOCK SWITCH
INSPECTION.)
• Is there any malfunction?
Yes
Replace the door lock switch, then go to the next step.
(See 09-14-8 DOOR LOCK SWITCH REMOVAL/
INSTALLATION.)
No
Go to the next step.
BCM
5N
5M
LOCK
UNLOCK
LOCK
UNLOCK
DOOR LOCK SWITCH
(DRIVER-SIDE)
DOOR LOCK SWITCH
(PASSENGER-SIDE)
C
D
C
D
DOOR LOCK SWITCH WIRING
HARNESS-SIDE CONNECTOR
BCM WIRING HARNESS-SIDE
CONNECTOR
5Q
5K
5B
5E
5H
5AC
5N
5Z
5T
5W
5G
5D
5A
A
B
C
D
5O
5AA
5U
5X
5Y
5V
5S
5P
5M
5AD
5AB
5I
5F
5J
5C
5L
5R
1871-1U-06B(09-02F).fm 17 ページ 2006年3月15日 水曜日 午前11時41分
![](/vehicles/rke/eetan/dot/plevese.png)
ON-BOARD DIAGNOSTIC [BCM]
09-02F–18
End Of Sie
DTC B2574[BCM]
id0902f5833100
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?
Yes
Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.
STEP
INSPECTION
ACTION
DTC B2574
Driver door lock switch short to ground
DETECTION
CONDITION
Short to GND in wiring harness between BCM and driver-side door lock-link switch
POSSIBLE
CAUSE
• Short to GND in wiring harness between BCM terminal 5G and front door latch and lock actuator
(driver-side) terminal E
• Front door latch and lock actuator (driver-side) malfunction
• BCM malfunction
FRONT DOOR LATCH AND LOCK
ACTUATOR (DRIVER-SIDE)
5J
BCM
5G
F
B
E
FRONT DOOR LATCH AND LOCK
ACTUATOR (DRIVER-SIDE) WIRING
HARNESS-SIDE CONNECTOR
BCM WIRING HARNESS-SIDE
CONNECTOR
5Q
5K
5B
5E
5H
5AC
5N
5Z
5T
5W
5G
5D
5A
5O
5AA
5U
5X
5Y
5V
5S
5P
5M
5AD
5AB
5I
5F
5J
5C
5L
5R
B
A
D
C
F
E
1871-1U-06B(09-02F).fm 18 ページ 2006年3月15日 水曜日 午前11時41分
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