DTC B1244 or DTC indicator F and MODE: An Open in the Rear Air Mix Control Motor Circuit

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.

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0) and then back to ON (II).
Do the self-diagnostic function with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS ) or the climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS ).
Check for DTCs.
Is DTC B1244 or F and MODE indicated?

YES -Go to step 5.

NO -Intermittent failure, check for loose wires or poor connections in the rear air mix control motor circuit.
Turn the ignition switch to LOCK (0).
Test the rear air mix control motor (see REAR AIR MIX CONTROL MOTOR TEST ).
Is the rear air mix control motor OK?

YES -Go to step 7.

NO -Replace the rear air mix control motor (see REAR BLOWER MOTOR REPLACEMENT ).
Disconnect the rear air mix control motor 7P connector.
Disconnect climate control unit connector A (40P) and B (14P).
Check for continuity between the following terminals of climate control unit connectors A (40P), B(14P), and the rear air mix control motor 7P connector.
40P:

No. 6

No. 8

14P:

No. 5

7P:

No. 5

No. 7

7P:

No. 3

Fig 1: Checking For Continuity Between Terminals Of Climate Control Unit Connectors A (40P), B(14P), And Rear Air Mix Control Motor 7P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Check for loose wires or poor connections at climate control unit connectors A (40P), B (14P), and at the rear air mix 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 CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ).

NO -Repair an open in the wire(s) between the climate control unit and the rear air mix control motor.