Climate Control Panel Circuit Troubleshooting

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Check the No. 3 (7.5 A) fuse in the driver's underdash fuse/relay box.
Is the fuse OK?
1. YES - Go to step 2.
2. NO - Replace the fuse and recheck.
Disconnect the climate control panel 16P connector.
Turn the ignition switch ON (II).
Measure the voltage between the No. 7 terminal of climate control panel 16P connector and body ground.

Fig 1: Measuring Voltage Between No. 7 Terminal Of Climate Control Panel 16P Connector And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 5.
2. NO - Repair open in the wire between the No. 3 fuse in the driver's underdash fuse/relay box and the climate control panel.
Turn the ignition switch OFF.
Disconnect climate control unit connectors A (16P) and B (26P).

Check for continuity between the following terminals of the climate control panel 16P connector and climate control unit connectors A (16P) and B (26P).

TERMINALS REFERENCE

PANEL 16P	UNIT 16P
No. 5	No. 12
No. 6	No. 14
No. 14	No. 13
PANEL 16P	UNIT 26P
No. 12	No. 16

Fig 2: Checking For Continuity Between Terminals Of Climate Control Panel 16P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Checking For Continuity Between Terminals Of Climate Control Unit Connectors A (16P) And B (26P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 8.
NO - Repair any open in the wire(s) between the climate control panel and climate control unit.

Check the continuity between the No. 5, 6, and 14 terminals of the climate control panel 16P connector and body ground individually.

Fig 4: Checking Continuity Between No. 5, 6, And 14 Terminals Of Climate Control Panel 16P Connector And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair any short to body ground in the wire(s) between the climate control panel and the climate control unit.
2. NO - Check for loose wires or poor connections at climate control unit connector A (16P) and B (26P) and at the climate control panel 16P connector. If the connections are good, substitute a known-good climate control panel, and recheck. If the symptom/indication is still present, substitute a known-good climate control unit, and recheck.