DTC : B1388 (2016 2017 2018)

DTC B1388  : Power Tailgate Drive Motor 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.

   - 3. Close the tailgate automatically with the keyless transmitter or power tailgate inside switch.

   - 4. Check for DTCs with the HDS.

   DTC Description	DTC
   B1388 Power Tailgate Drive Motor circuit malfunction

   Is DTC B1388 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 drive unit.

2. Fuse check

   - 1. Check the following fuse.

   Fuse	No. B1-4 (40 A)
   Location	Auxiliary under-hood fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 3.

   NO 

   Replace the fuse. If the fuse blows again, repair a short to ground in the No. B1-4 (40 A) fuse circuit.

3. Power tailgate relay test

   - 1. Do the Power Relay (2016 2017 2018) test.

   Is the power tailgate relay OK?

   YES 

   Go to step 4.

   NO 

   Replace the power tailgate relay.

4. Power tailgate motor check

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

   - 2. Test the Power Tailgate Motor

   Is the motor OK?

   YES 

   Go to step 5.

   NO 

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

5. Shorted wire check (PTG PTM(+) line)

   - 1. Disconnect the following connector.

   Power tailgate control unit connector A (5P)

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

   Test condition	Vehicle OFF (LOCK) mode Power tailgate control unit connector A (5P): disconnected Drive unit connector A (2P): disconnected
   Test point 1	Drive unit connector A (2P) No. 1
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   The PTG PTM(+) wire is not shorted. Go to step 6.

6. Shorted wire check (PTG PTM(-) line)

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

   Test condition	Vehicle OFF (LOCK) mode Power tailgate control unit connector A (5P): disconnected Drive unit connector A (2P): disconnected
   Test point 1	Drive unit connector A (2P) No. 2
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair a short to ground in the wire.

   NO 

   The PTG PTM(-) wire is not shorted. Go to step 7.

7. Open wire check (PTG PTM(+) line)

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

   Test condition	Vehicle OFF (LOCK) mode Power tailgate control unit connector A (5P): disconnected Drive unit connector A (2P): disconnected
   Test point 1	Drive unit connector A (2P) No. 1
   Test point 2	Power tailgate control unit connector A (5P) No. 3 - Refer to: Power Tailgate Control Unit Connector for Inputs and Outputs (2016 2017 2018)

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

   Is there continuity?

   YES 

   Repair an open or high resistance in the wire.

   NO 

   Repair an open or high resistance in the wire.