2010 Acura Truck MDX V6-3.7L Page 35

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

6. Remove the outside air temperature sensor See: Heating and Air Conditioning/Ambient Temperature Sensor / Switch HVAC/Service and

Repair, and test it See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General Diagnostics/Outside Air

Temperature Sensor Test.

Is the outside air temperature sensor OK?

YES -

With the outside air temperature sensor disconnected, go to step 7.

NO -

Replace the outside air temperature sensor See: Heating and Air Conditioning/Ambient Temperature Sensor / Switch HVAC/Service and Repair.?

7. Disconnect climate control unit connector A (40P).

8. Check for continuity between climate control unit connector A (40P) terminal No. 28 and body ground.

Is there continuity?

YES -

Repair a short to body ground in the wire between the climate control unit and the outside air temperature sensor.?

NO -

Go to step 9.

9. Check for continuity between climate control unit connector A (40P) terminals No. 8 and No. 28.

Is there continuity?

YES -

Repair a short in the wires between the climate control unit and the outside air temperature sensor.?

NO -

Substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit See:

Heating and Air Conditioning/Control Assembly/Service and Repair/Climate Control Unit Removal/Installation.?

E and Auto

DTC Troubleshooting: B1229 (E and AUTO)

DTC B1229 or DTC indicator E and AUTO:

2010 Acura Truck MDX V6-3.7L Page 157

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

6. Start the engine.

7. Do the DAMPER FORCE OPERATION TEST in the FUNCTIONAL TESTS MENU with the HDS.

8. Check for DTCs with the HDS.

Is DTC 5-5, 5-6, 5-7, or 5-8 indicated?

YES -

Go to step 9.

NO -

Intermittent failure, the system is OK at this time. Check for poor or loose connections between the damper coil and the active damper control

unit.?

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

10. Disconnect active damper control unit connector A (20P) See: Relays and Modules/Relays and Modules - Steering and Suspension/Relays

and Modules - Suspension/Suspension Control Module/Service and Repair.

11. Turn the ignition switch to ON (II).

12. Measure the voltage between body ground and the appropriate active damper control unit connector A (20P) terminal.

Is there battery voltage?

YES -

Repair a short to power in the wire between the appropriate damper coil and the active damper control unit, then go to step 18.

NO -

Go to step 13.

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

14. Measure resistance between the appropriate active damper control unit connector A (20P) terminals (see table).