DTC B1388: Power Tailgate Drive Motor Circuit Malfunction

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .

• 1. Problem verification:

  1. Clear the DTCs with the HDS.

  2. Open the tailgate.

  3. Close the tailgate automatically with the remote 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. A1-2 (40 A)
  Location	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. A1-2 (40 A) fuse circuit.

• 3. Power tailgate motor check:

  1. Test the power tailgate motor .

  Is the motor OK?

  YES 

  Go to step 4.

  NO 

  Faulty power tailgate motor; replace the drive unit .

• 4. Shorted wire check (PTG/PTL PTM+ line):

  1. Disconnect the following connector.

  Power tailgate control unit connector C (5P)

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

  Test condition	Vehicle OFF (LOCK) mode Power tailgate control unit connector C (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/PTL PTM+ wire is not shorted. Go to step 5.

• 5. Shorted wire check (PTG/PTL PTM- line):

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

  Test condition

  Vehicle OFF (LOCK) mode Power tailgate control unit connector C (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/PTL PTM- wire is not shorted. Go to step 6.

• 6. Open wire check (PTG/PTL PTM+ line):

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

  Test condition	Vehicle OFF (LOCK) mode Power tailgate control unit connector C (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 C (5P) No. 3

  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.