DTC B1386: Power Tailgate Sensor Pulse A 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 .
• If the motor does not operate, do the motor test first .

• 1. Problem verification 1:

  1. Clear the DTCs with the HDS.

  2. Open the tailgate with the tailgate outer handle switch.

  3. Close the tailgate automatically with the remote or power tailgate inside switch.

  4. Check for DTCs with the HDS.

  DTC Description	DTC
  B1386 Power Tailgate Sensor Pulse A Circuit Malfunction

  Is DTC B1386 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. Problem verification 2:

  1. Check for DTCs with the HDS.

  DTC Description	DTC
  B1387 Power Tailgate Sensor Pulse B Circuit Malfunction

  Is DTC B1387 indicated?

  YES 

  Go to step 3.

  NO 

  Go to step 4.

• 3. Shorted wire check (PTG/PTL SVCC line):

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

  2. Disconnect the following connector.

  Drive unit connector B (8P)

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

  Test condition	Vehicle OFF(LOCK) mode Drive unit connector B (8P): disconnected
  Test point 1	Drive unit connector B (8P) No. 8
  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 

  Replace the power tailgate control unit .

• 4. Determine possible failure area (power tailgate sensor, others):

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

  2. Disconnect the following connector.

  Drive unit connector B (8P)

  3. Turn the vehicle to the ON mode.

  4. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode Drive unit connector B (8P): disconnected
  Test point 1	Drive unit connector B (8P) No. 7
  Test point 2	Body ground

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

  Is there about 5V?

  YES 

  Faulty power tailgate sensor; replace the drive unit .

  NO 

  Go to step 5.

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

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

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

  Test condition	Vehicle OFF (LOCK) mode Drive unit connector B (8P): disconnected
  Test point 1	Drive unit connector B (8P) No. 7
  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 

  Go to step 6.

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

  1. Disconnect the following connector.

  Power tailgate control unit connector B (20P)

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

  Test condition	Vehicle OFF (LOCK) mode Drive unit connector B (8P): disconnected Power tailgate control unit connector B (20P): disconnected
  Test point 1	Drive unit connector B (8P) No. 7
  Test point 2	Power tailgate control unit connector B (20P) No. 17

  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.