DTC B1388

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

DTC (Power Tailgate Control Unit)

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -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.

2. 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 3.

   NO 

   Faulty power tailgate motor; replace the power tailgate drive unit .

3. Shorted wire check (PTG/PTL_PTM+ line)

   -1. Disconnect the following connector.

   Power tailgate control unit connector C (5P)

   -2. Measure the resistance between test points 1 and 2.

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

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

   Is there 1.0 MΩ or more?

   YES 

   The PTG/PTL_PTM+ wire is not shorted. Go to step 4.

   NO 

   Repair a short to ground in the wire.

4. Shorted wire check (PTG/PTL_PTM- line)

   -1. Measure the resistance between test points 1 and 2.

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

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

   Is there 1.0 MΩ or more?

   YES 

   The PTG/PTL_PTM- wire is not shorted. Go to step 5.

   NO 

   Repair a short to ground in the wire.

5. Open wire check (PTG/PTL_PTM+ line)

   -1. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Power tailgate control unit connector C (5P): disconnected Power tailgate drive unit connector A (2P): disconnected
   Test point 1	Power tailgate drive unit connector A (2P) (male terminals) No. 1:
   Test point 2	Power tailgate control unit connector C (5P) No. 3

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

   Is there 1.0 Ω or less?

   YES 

   The PTG/PTL_PTM+ wire is not opened. Go to step 6.

   NO 

   Repair an open or high resistance in the wire.

6. Open wire check (PTG/PTL_PTM- line)

   -1. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode Power tailgate control unit connector C (5P): disconnected Power tailgate drive unit connector A (2P): disconnected
   Test point 1	Power tailgate drive unit connector A (2P) (male terminals) No. 2:
   Test point 2	Power tailgate control unit connector C (5P) No. 5

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

   Is there 1.0 Ω or less?

   YES 

   Replace the power tailgate control unit .

   NO 

   Repair an open or high resistance in the wire.