DTC B1178:11 [BCM]


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Malfunction Location

•  Liftgate latch switch circuit malfunction

Detection Condition

•  Short to ground in wiring harness between liftgate latch switch in liftgate latch and lock actuator and BCM

Possible Causes

•  DTC inspection is performed with liftgate latch switch on
•  Connection malfunction with connector
•  Short circuit to ground in wiring harness between liftgate latch and lock actuator terminal C and BCM terminal 7S
•  Liftgate latch and lock actuator malfunction
•  BCM malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1
PERFORM DTC INSPECTION
•  Clear DTCs using the M-MDS.
•  Close the liftgate. (Liftgate latch switch off)
•  Perform the BCM DTC inspection using the M-MDS.
•  Is DTC B1178:11 displayed?
Yes
Go to the next step.
No
DTC troubleshooting completed.
2
VERIFY LIFTGATE LATCH AND LOCK ACTUATOR CONNECTOR CONDITION
•  Disconnect the negative battery cable.
•  Disconnect the liftgate latch and lock actuator connector.
•  Inspect the connection condition and wiring harness.
•  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?
Yes
Go to the next step.
No
Repair or replace the connector, then go to the final step.
3
VERIFY LIFTGATE LATCH AND LOCK ACTUATOR CONDITION
•  Remove the liftgate latch switch.
•  Inspect the liftgate latch switch.
•  Is the liftgate latch switch normal?
Yes
Go to the next step.
No
Replace the liftgate latch and lock actuator, then go to the final step.
4
VERIFY BCM CONNECTOR CONDITION
•  Disconnect the BCM connector.
•  Inspect the connection condition and wiring harness.
•  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?
Yes
Go to the next step.
No
Repair or replace the connector, then go to the final step.
5
VERIFY WIRING HARNESS BETWEEN LIFTGATE LATCH AND LOCK ACTUATOR AND BCM FOR SHORT TO GROUND
•  Inspect for continuity between BCM terminal 7S and body ground.
•  Is there continuity?
Yes
Repair or replace the related wiring harness, then go to the final step.
No
Go to the next step.
6
VERIFY TROUBLESHOOTING COMPLETED
•  Connect all the connectors.
•  Connect the battery cable.
•  Clear DTCs using the M-MDS.
•  Close the liftgate. (Liftgate latch switch off)
•  Perform the BCM DTC inspection using the M-MDS.
•  Is DTC B1178:11 displayed?
Yes
Replace the BCM.
No
DTC troubleshooting completed.