DTC B1178:11 [REAR BODY CONTROL MODULE (RBCM)]

id0902p4014400

Description

Liftgate latch switch circuit malfunction
Detection condition
•  Rear body control module (RBCM) detects short to ground in liftgate latch switch circuit with the liftgate closed (liftgate latch switch off).
Fail-safe function
Not applicable
Possible cause
•  Liftgate latch and lock actuator connector or terminal malfunction
•  Liftgate latch switch malfunction
•  Rear body control module (RBCM) connector or terminal malfunction
•  Short to ground in wiring harness between rear body control module (RBCM) terminal 4K and liftgate latch and lock actuator terminal C
•  Rear body control module (RBCM) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY REAR BODY CONTROL MODULE (RBCM) DTCs AGAIN
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Go to the next step.
No
Go to Step 7.
2
INSPECT LIFTGATE LATCH AND LOCK ACTUATOR CONNECTOR
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Disconnect the liftgate latch and lock actuator connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 6.
3
INSPECT 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 Step 6.
(See LIFTGATE LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
4
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR
•  Disconnect the rear body control module (RBCM) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 6.
5
INSPECT FOR SHORT TO GROUND IN LIFTGATE LATCH SWITCH CIRCUIT
•  Verify that the rear body control module (RBCM) and liftgate latch and lock actuator connectors are disconnected.
•  Inspect for continuity between liftgate latch and lock actuator terminal C (wiring harness) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between rear body control module (RBCM) terminal 4K and liftgate latch and lock actuator terminal C.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to the next step.
No
Go to the next step.
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM).
Go to the next step.
No
Go to the next step.
7
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
No
DTC troubleshooting completed.