2010 Acura Truck MDX V6-3.7L Page 166

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.

2010 Acura Truck MDX V6-3.7L Page 163

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. Disconnect power tailgate control unit connector A (5P).

8. Disconnect drive unit connector A (2P).

9. Check for continuity between body ground and power tailgate control unit connector A (5P) terminals No. 3 and No. 5 individually.

Is there continuity?

YES -

Repair a short to ground in the wire.?

NO -

Go to step 10.

10. Reconnect drive unit connector A (2P).

11. Connect battery power to the power tailgate control unit connector A (5P) terminal No. 3 (or No. 5) and ground the terminal No. 5 or (No. 3).

12. Check the power tailgate motor operation.

Does the motor run normally?

YES -

Go to step 13.

NO -

Faulty power tailgate motor, replace the drive unit.?

13. Disconnect power tailgate control unit connector B (20P).

14. Disconnect drive unit connector B (8P).

15. Check for continuity between body ground and power tailgate control unit connector B (20P) terminals No. 9 and No. 20 individually.

2010 Acura Truck MDX V6-3.7L Page 119

Go to step 6.

6. Turn the ignition switch to LOCK (0).

7. Test the rear air mix control motor See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General

Diagnostics/Rear Air Mix Control Motor Test.

Is the rear air mix control motor OK?

YES -

Go to step 8.

NO -

Replace the rear air mix control motor See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Rear Air Mix

Control Motor Replacement.?

8. Disconnect the rear air mix control motor 7P connector.

9. Disconnect climate control unit connector A (40P) and B (14P).

10. Check for continuity between climate control unit connector B (14P) terminal No. 5 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire between the climate control unit and the rear air mix control motor.?

NO -

Go to step 11.

11. Check for continuity between climate control unit connector A (40P) terminal No. 6 and climate control unit connector B (14P) terminal No.

5.

Is there continuity?

YES -

Repair a short in the wires.?