DTC : B1390 (2019 2020 2021)

DTC B1390  : Power Tailgate Closer Motor Function Error

• 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 .
• Before troubleshooting, make sure the fuses associated with the system is OK.

DTCs (Power Tailgate Control Unit)

1. Problem verification

   - 1. Clear the DTCs with the HDS.

   Clear DTCs

   - 2. With the tailgate closed, push the tailgate outer handle switch and wait for 10 seconds.

   - 3. Check for DTCs with the HDS.

   DTC Description	DTC
   B1390 Power Tailgate Closer Motor Function Error

   Is DTC B1390 indicated?

   YES 

   Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. DTC check

   - 1. Check for power tailgate system DTCs with the HDS.

   DTC Description	DTC

   Are any DTCs indicated?

   YES 

   Go to the indicated DTCs troubleshooting, then recheck.

   NO 

   Go to step 3.

3. Open wire check (PTG CLM+ line)

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

   - 2. Disconnect the following connectors.

   Power tailgate closer unit connector A (2P) Power tailgate control unit connector B (10P)

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

   Test condition	Vehicle OFF (LOCK) mode Power tailgate closer unit connector A (2P): disconnected Power tailgate control unit connector B (10P): disconnected
   Test point 1	Power tailgate closer unit connector A (2P) (female terminals) No. 2: (1)
   Test point 2	Power tailgate control unit connector B (10P) No. 2 - Refer to: Power Tailgate Control Unit Connector for Inputs and Outputs (2019 2020 2021)

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

   Is there continuity?

   YES 

   The PTG CLM+ wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the wire.

4. Open wire check (PTG CLM- line)

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

   Test condition	Vehicle OFF (LOCK) mode Power tailgate closer unit connector A (2P): disconnected Power tailgate control unit connector B (10P): disconnected
   Test point 1	Power tailgate closer unit connector A (2P) (female terminals) No. 1: (1)
   Test point 2	Power tailgate control unit connector B (10P) No. 6 - Refer to: Power Tailgate Control Unit Connector for Inputs and Outputs (2019 2020 2021)

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

   Is there continuity?

   YES 

   Faulty closer motor; replace the power tailgate closer unit - Go to: Tailgate Support Strut (With Power Tailgate) .

   NO 

   Repair an open or high resistance in the wire.