DTC B1178-11: Boot/Trunk Ajar Switch Circuit Short To Ground: Procedure

1. Clear the DTC for the main body ECU using the Techstream.

   Refer to DTC CHECK / CLEAR

   Body Electrical > Body Control Module > Clear DTCs 

2. Open/close the trunk.
3. Retrieve the main body ECU DTCs using the Techstream.

   Refer to DTC CHECK / CLEAR

   Body Electrical > Body Control Module > Trouble Codes 

4. Is the same DTC displayed?

   Result

   Result
   Yes
   No

Result:  2

No 

See step  7

Result:  1

Yes 

See step  2

1. Switch the ignition off
2. Disconnect the negative battery cable.

   Refer to REMOVAL

3. Disconnect the luggage compartment door lock connector.
4. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
5. Is the connector normal?

   Result

   Result
   Yes
   No

Result:  2

No 

See step  12

Result:  1

Yes 

See step  3

1. Inspect the trunk lid latch switch.

   Refer to INSPECTION

2. Is the trunk lid latch switch normal?

   Result

   Result
   Yes
   No

Result:  2

No 

See step  11

Result:  1

Yes 

See step  4

1. Disconnect the main body ECU connector
2. Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
3. Is there continuity?

   Result

   Result
   Yes
   No

Result:  2

No 

See step  10

Result:  1

Yes 

See step  5

1. Verify that the luggage compartment door lock and main body ECU connectors are disconnected.
2. Inspect for continuity between luggage compartment door lock terminal E28-3*1 or E35-3*2 (wiring harness) and body ground.
   • *1: w/o Smart Key System

     *2: w/ Smart Key System

3. Is there continuity?

   Result

   Result
   Yes
   No

Result:  2

Yes 

See step  9

Result:  1

No 

See step  6

1. Always reconnect all disconnected connectors.
2. Connect the negative battery cable.

   Refer to INSTALLATION

3. Clear the DTC for the main body ECU using the Techstream.

   Refer to DTC CHECK / CLEAR

   Body Electrical > Body Control Module > Clear DTCs 

4. Open/close the trunk.
5. Retrieve the main body ECU DTCs using the Techstream.

   Refer to DTC CHECK / CLEAR

   Body Electrical > Body Control Module > Trouble Codes 

6. Is the same DTC displayed?

   Result

   Result
   Yes
   No

Result:  2

Yes 

See step  8

Result:  1

No 

See step  7

1. Are any other DTCs displayed?

   Result

   Result
   Yes
   No

Result:  1

Yes 

REPAIR OR REPLACE THE MALFUNCTIONING PART ACCORDING TO THE APPLICABLE DTC TROUBLESHOOTING. 

1. Refer to DIAGNOSTIC TROUBLE CODE CHART

Result:  2

No 

DTC TROUBLESHOOTING COMPLETED. 

1. If the malfunction recurs, replace the main body ECU.

   Refer to REMOVAL

2. Go to the next step.

   Result

   Proceed to
   NEXT

Result:  1

NEXT 

See step  7

• *1: w/o Smart Key System

  *2: w/ Smart Key System

1. If there is a common connector:
   1. 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.
   2. Repair or replace the malfunctioning part.
2. If there is no common connector:

   Repair or replace the wiring harness which has a short to ground.

3. Go to the next step

   Result

   Proceed to
   NEXT

Result:  1

NEXT 

See step  6

1. Then go to the next step.

   Result

   Proceed to
   NEXT

Result:  1

NEXT 

See step  6

1. Refer to INSPECTION
2. Then go to the next step.

   Result

   Proceed to
   NEXT

Result:  1

NEXT 

See step  6

1. Then go to the next step.

   Result

   Proceed to
   NEXT

Result:  1

NEXT 

See step  6