Go to step 6.
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.?
6. Turn the ignition switch to LOCK (0).
7. Open the tailgate.
8. Disconnect power tailgate control unit connector B (20P).
9. Check for continuity between body ground and power tailgate control unit connector B (20P) terminals No. 9 and No. 20 individually.
Is there continuity?
YES -
Repair a short to ground in the wire. If the wire is OK, replace the drive unit.?
NO -
Go to step 10.
10. Measure the voltage between power tailgate control unit connector B (20P) terminal No. 12 and body ground.
Is there battery voltage?
YES -
Replace the power tailgate control unit.?
NO -
Check the No. 6 (20 A) fuse in the rear fuse/relay box. If the fuse is OK, check for an open in the wire between the rear fuse/relay box and the
power tailgate control unit.?
B1390
DTC Troubleshooting: B1390
DTC B1390:
Power Tailgate Closer Function Error
1. With the tailgate closed, pull the tailgate outer handle and wait for 10 seconds.
