A/C Control Power and Ground Circuit Troubleshooting

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

Check the No. 30 (10 A) fuse in the driver's under-dash fuse/relay box.
Is the fuse OK?
1. YES - Go to step 2.
2. NO - Replace the fuse, and recheck.
Disconnect A/C control panel connector A (22P).
Turn the ignition switch ON (II).
Measure the voltage between the No. 11 terminal of A/C control panel connector A (22P) and body ground.

Fig 1: Measuring Voltage Between No. 11 Terminal Of A/C Control Panel Connector A (22P) 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. 30 fuse in the driver's under-dash fuse/relay box and the A/C control panel.
Turn the ignition switch OFF.
Check for continuity between the No. 1 terminal of A/C control panel connector A (22P) and body ground.

Fig 2: Checking Continuity Between No. 1 Terminal Of A/C Control Panel Connector A (22P) And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 7.
2. NO - Check for an open in the wire between the A/C control panel and body ground. If the wire is OK, check for poor ground at G504.
Disconnect the rear A/C control panel 5P connector.
Turn the ignition switch ON (II).
Measure the voltage between the No. 3 terminal of rear A/C control panel 5P connector and body ground.

Fig 3: Measuring Voltage Between No. 3 Terminal Of Rear A/C Control Panel 5P Connector And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?
1. YES - Go to step 10.
2. NO - Repair open in the wire between the No. 30 (10 A) fuse in the driver's under-dash fuse/relay box and the rear A/C control panel.
Turn the ignition switch OFF.
Check for continuity between the No. 1 terminal of the rear A/C control panel 5P connector and body ground.

Fig 4: Checking Continuity Between No. 1 Terminal Of Rear A/C Control Panel 5P Connector And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 12.
2. NO - Check for an open in the BLK wire between the rear A/C control panel and body ground. If the wire is OK, check for poor ground at G601.
Disconnect A/C control panel connector B (14P).
Check for continuity between the No. 4 terminal of A/C control panel connector B (14P) and the No. 2 terminal of rear A/C control panel 5P connector.

Fig 5: Checking Continuity Between No. 4 Terminal Of A/C Control Panel Connectors B (14P) And No. 2 Terminal Of Rear A/C Control Panel 5P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Go to step 14.
2. NO - Repair open in the wire between the A/C control panel and rear A/C control panel.
Check for continuity between the No. 2 terminal of rear A/C control panel 5P connector and body ground.

Fig 6: Checking Continuity Between No. 2 Terminal Of Rear A/C Control Panel 5P Connector And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair short to body ground in the wire between the A/C control panel and the rear A/C control panel.
2. NO - Check for loose wires or poor connections at A/C control panel connector A (22P), B (14P) and rear A/C control panel 5P connector. If the connections are good, substitute a known-good A/C control panel, and recheck. If the symptom/indication is still present, substitute a known-good A/C control panel, and recheck.