Mazda CX-7 2007 Workshop Manual page 1384

End Of Sie
DTC C1189[BCM]
DTC C1189 Brake fluid level sensor input short to ground
DETECTION Short to GND in wiring harness between BCM and brake fluid level sensor
CONDITION
• Short to GND in wiring harness between BCM terminal 1E and brake fluid level sensor terminal A
POSSIBLE
• Brake fluid level sensor input malfunction
CAUSE
• BCM malfunction
BRAKE FLUID LEVEL SENSOR WIRING
Diagnostic procedure
STEP
1 INSPECT BRAKE FLUID LEVEL SENSOR
CONNECTOR
• Disconnect the brake fluid level sensor
connector.
• Inspect the brake fluid level sensor
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 BRAKE FLUID LEVEL SENSOR
SIGNAL CIRCUIT FOR SHORT TO GND
• Inspect for continuity between BCM terminal
1E (wiring harness-side) and body GND.
• Is there continuity?
4 INSPECT BRAKE FLUID LEVEL SENSOR
• Inspect the brake fluid level sensor.
(See 04-11-11 BRAKE FLUID LEVEL
SENSOR 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–22
ON-BOARD DIAGNOSTIC [BCM]
BRAKE FLUID
LEVEL SENSOR
B A
HARNESS-SIDE CONNECTOR
A
B
INSPECTION
BCM
1E
BCM WIRING HARNESS-SIDE
CONNECTOR
1O 1M 1K 1I 1G
1P 1N 1L 1J 1H
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 brake fluid level sensor, then go to the next
step.
No Go to the next step.
Yes Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No DTC troubleshooting completed.
id0902f5836600
1E 1C 1A
1F 1D 1B
ACTION