DTC : B1381

DTC B1381  : Tailgate Closer Unit Release switch circuit malfunction

DTCs (Power Tailgate Control Unit)

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .

1. Problem verification

   - 1. Clear the DTCs with the HDS.

   Clear DTCs

   - 2. Open the tailgate with the tailgate outer handle switch.

   - 3. Close the tailgate manually.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   B1381 Tailgate Closer Unit Release switch circuit malfunction

   Is DTC B1381 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections between the power tailgate control unit and the power tailgate closer unit.

2. Determine possible failure area (PTG RS line short, others)

   - 1. Check the parameter(s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Latch Gear Position Sw. release

   Is data list value ON?

   YES 

   Go to step 3.

   NO 

   Go to step 5.

3. Determine possible failure area (power tailgate closer unit, others)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Power tailgate closer unit connector B (6P)

   - 3. Turn the vehicle to the ON mode.

   - 4. Check the parameter(s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Latch Gear Position Sw. release

   Is data list value ON?

   YES 

   Go to step 4.

   NO 

   Faulty release switch; replace the Tailgate Latch .

4. Shorted wire check (PTG RS line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Power tailgate control unit connector C (14P)

   - 3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Power tailgate closer unit connector B (6P): disconnected Power tailgate control unit connector C (14P): disconnected
   Test point 1	Power tailgate control unit connector C (14P) No. 4 - Refer to: Power Tailgate Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Power Tailgate Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   Replace the Power Tailgate Control Unit .

5. Determine possible failure area (power tailgate closer unit, others)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Power tailgate closer unit connector B (6P)

   - 3. Connect terminals A and B with a jumper wire.

   Terminal A	Power tailgate closer unit connector B (6P) No. 1
   Terminal B	Power tailgate closer unit connector B (6P) No. 6

   Courtesy of HONDA, U.S.A., INC.

   - 4. Turn the vehicle to the ON mode.

   - 5. Check the parameter(s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Latch Gear Position Sw. release

   Is data list value ON?

   YES 

   Faulty release switch; replace the Tailgate Latch .

   NO 

   Go to step 6.

6. Determine possible failure area (PTG RS line, PTG SEG3 line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the jumper wire.

   - 3. Connect terminals A and B with a jumper wire.

   Terminal A	Power tailgate closer unit connector B (6P) No. 1
   Terminal B	Body ground

   Courtesy of HONDA, U.S.A., INC.

   - 4. Turn the vehicle to the ON mode.

   - 5. Check the parameter(s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   Latch Gear Position Sw. release

   Is data list value ON?

   YES 

   Go to step 7.

   NO 

   Go to step 8.

7. Open wire check (PTG SEG3 line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the jumper wire.

   - 3. Disconnect the following connector.

   Power tailgate control unit connector C (14P)

   - 4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Power tailgate closer unit connector B (6P): disconnected Power tailgate control unit connector C (14P): disconnected
   Test point 1	Power tailgate closer unit connector B (6P) No. 6
   Test point 2	Power tailgate control unit connector C (14P) No. 11 - Refer to: Power Tailgate Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Power Tailgate Control Unit Connector for Inputs and Outputs (2019 2020 2021)

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace the Power Tailgate Control Unit .

   NO 

   Repair an open or high resistance in the wire.

8. Open wire check (PTG RS line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the jumper wire.

   - 3. Disconnect the following connector.

   Power tailgate control unit connector C (14P)

   - 4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Power tailgate closer unit connector B (6P): disconnected Power tailgate control unit connector C (14P): disconnected
   Test point 1	Power tailgate closer unit connector B (6P) No. 1
   Test point 2	Power tailgate control unit connector C (14P) No. 4 - Refer to: Power Tailgate Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Power Tailgate Control Unit Connector for Inputs and Outputs (2019 2020 2021) .

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace the Power Tailgate Control Unit .

   NO 

   Repair an open or high resistance in the wire.