2010 Acura Truck MDX V6-3.7L Page 85

Is there continuity between any of the terminals?

YES -

Repair a short in the wires.?

NO -

Go to step 12

12. Reconnect climate control unit connector A (40P).

13. Turn the ignition switch to ON (II), and measure the voltage between the same terminals and body ground.

Is there any voltage?

YES -

Repair a short to power in the wire(s) between the climate control unit and the recirculation control motor. This short may also damage the

climate control unit. Repair a short to power before replacing the climate control unit.?

NO -

Check for loose wires or poor connections at climate control unit connector A (40P) and at the recirculation control motor 7P connector. If the

connections are good, 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.?

B1223

DTC Troubleshooting: B1223 (M)

DTC B1223 or DTC indicator M and MODE:

A Problem in the Rear Blower Motor Circuit

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Do the self-diagnostic function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1223 or M and MODE indicated?

2010 Acura Truck MDX V6-3.7L Page 110

Is there continuity between any of the terminals?

YES -

Repair a short in the wires.?

NO -

Go to step 12.

12. Turn the ignition switch to ON (II), and measure the voltage between the same terminal and body ground.

Is there any voltage?

YES -

Repair a short to power in the wire(s) between the climate control unit and the front mode control motor. This short may also damage the climate

control unit. Repair a short to power before replacing the climate control unit.?

NO -

Check for loose wires or poor connections at climate control unit connector A (40P) and at the front mode control motor 7P connector. If the

connections are good, 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.?

B1240

DTC Troubleshooting: B1240 (B and MODE)

DTC B1240 or DTC indicator B and MODE:

A Problem in the Front Mode Control Linkage, Doors, or Motor Circuit

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Do the self-diagnostic function with the HDS or the climate control unit.

4. Check for DTCs.

Is DTC B1240 or B and MODE indicated?

2010 Acura Truck MDX V6-3.7L Page 786

Is there continuity between any of the terminals?

YES -

There is a short in the wires between the AcuraLink control unit (XM receiver) and the audio-navigation unit. Replace the affected shielded

harness.?

NO -

Go to step 11.

11. Connect AcuraLink control unit (XM receiver) connector A (32P) terminals No. 30 and No. 31 with a jumper wire.

12. Check for continuity between audio-navigation unit connector D (14P) terminals No. 9 and No. 10.

Is there continuity?

YES -

Replace the audio-navigation unit See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Service and

Repair/Audio-Navigation Unit Removal/Installation.?

NO -

There is an open in the wire(s) between the AcuraLink control unit (XM receiver) and the audio-navigation unit. Replace the affected shielded

harness.?

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

14. Connect the HDS to the DLC See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Testing and Inspection/Initial

Inspection and Diagnostic Overview/How to Troubleshoot the AcuraLink.

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

16. Check for DTCs with the HDS.

Are any AcuraLink DTCs indicated?

YES -

Do the AcuraLink DTCs troubleshooting.?