DTC : B1388 (2019 2020 2021)

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 - 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. Open the tailgate.

   - 3. Close the tailgate automatically with the keyless 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.

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 - Go to: Tailgate Support Strut (With Power Tailgate) .

3. Shorted wire check (PTG 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 Power tailgate drive unit connector A (2P): disconnected
   Test point 1	Power tailgate drive unit connector A (2P) (male terminals) No. 1: (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 4.

4. 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 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: (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 5.

5. 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 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: (1)
   Test point 2	Power tailgate control unit connector C (5P) No. 3 - 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 PTM(+) wire is not opened. Go to step 6.

   NO 

   Repair an open or high resistance in the wire.

6. 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 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: (1)
   Test point 2	Power tailgate control unit connector C (5P) No. 5 - 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 

   Replace the Power Tailgate Control Unit .

   NO 

   Repair an open or high resistance in the wire.