DTC Troubleshooting: B1388

DTC B1388: Power tailgate Motor Malfunction

1. Clear the DTCs using the HDS.

1. Open the tailgate fully, then close the tailgate fully with the transmitter or the power tailgate inner switch.

1. Check the DTCs by selecting the DTCs MENU (DTCs) from the HDS.

Is DTC B1388 indicated?

YES | - | Go to Step 4 .
NO | - | Intermittent failure, the system is OK at this time.■

1. Cycle the ignition switch to OFF.

1. Open the tailgate fully with the tailgate outer handle.

1. Disconnect power tailgate control unit connector C (4P).

1. Check for continuity between the No. 1 terminal of power tailgate control unit connector C (4P) and body ground.

Is there continuity?

YES | - | Repair a short in the BLK (PTG+) wire.■
NO | - | Go to Step 8 .

1. Check for continuity between the No. 2 terminal of power tailgate control unit connector C (4P) and body ground.

Is there continuity?

YES | - | Repair a short in the WHT (PTG−) wire.■
NO | - | Go to Step 9 .

1. Connect battery positive (+) terminal to the No. 1 terminal of power tailgate control unit connector C (4P), and connect battery negative (−) terminal to the No. 2 terminal, then operate in reverse connecting.

Is there smooth rotation?

YES | - | Go to Step 10 .
NO | - | Faulty power tailgate motor; replace the power tailgate drive unit.■

1. Check for continuity between the No. 3 terminal of power tailgate control unit connector C (4P) and body ground.

Is there continuity?

YES | - | Repair a short in the BRN/BLK (CLU+) wire.■
NO | - | Go to Step 11 .

1. Check for continuity between the No. 4 terminal of power tailgate control unit connector C (4P) and body ground.

Is there continuity?

YES | - | Repair a short in the RED/GRN (CLU−) wire.■
NO | - | Go to Step 12 .

1. Check the operation noise with connect battery positive (+) terminal to the No. 3 terminal of power tailgate control unit connector C (4P), and connect battery negative (−) terminal to the No. 4 terminal.

Is there operation sound?

YES | - | Go to Step 13 .
NO | - | Faulty power tailgate clutch; replace the power tailgate drive unit.■

1. Disconnect the power tailgate control unit connector B (5P).

1. Check for voltage between the No. 2 terminal of power tailgate control unit connector B (5P) and body ground.

Is there battery voltage?

YES | - | Go to Step 15 .
NO | - | Repair an open in the WHT/GRN (VMP1) wire, or blown No. 42 (40 A) fuse in the under-hood subfuse box.■

1. Check for continuity between the No. 1 terminal of power tailgate control unit connector B (5P) and body ground.

Is there battery voltage?

YES | - | Go to Step 16 .
NO | - | Repair an open in the WHT/YEL (VMP2) wire, or blown No. 41 (20 A) in the under-hood subfuse box.■

1. Check for continuity between the No. 3 and No. 5 terminals of power tailgate control unit connector B (5P) and body ground.

Is there continuity?

YES | - | Faulty power tailgate control unit; replace it.■
NO | - | Repair an open in the BLK (PG1, PG2) wire(s), or poor ground (G705).■