DTC B1389: Power Tailgate Motor Clutch Circuit Malfunction
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
- Open the tailgate.
- Close the tailgate automatically with the keyless transmitter or inside tailgate switch.
- Turn the ignition switch to LOCK (0) and then back to ON (II).
- Clear the DTCs with the HDS.
- Check for DTCs with the HDS.
Is DTC B1389 indicated?
YES -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.
- Turn the ignition switch to LOCK (0).
- Open the tailgate.
- Disconnect power tailgate control unit connector B (20P).
- Check for continuity between body ground and power tailgate control unit connector B (20P) terminals No. 9 and No. 20 individually.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.
- Measure the voltage between power tailgate control unit connector B (20P) terminal No. 12 and body ground.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.