DTC Troubleshooting: 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 associated with the system is OK.

DTC Description
DTC
B1388 Power Tailgate Drive Motor circuit malfunction
  

1.
Problem verification:

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:

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):

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
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


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The PTG/PTL PTM? wire is not shorted. Go to step 4.
4.
Shorted wire check (PTG/PTL PTM? line):

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
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


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.
Open wire check (PTG/PTL PTM? line):

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
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


Is there continuity?

     
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):

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
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


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open or high resistance in the wire.?