Climate Control Power and Ground Circuit Troubleshooting

Is the fuse OK? 

1. YES  - Go to step 2.
2. NO  - Replace the fuse, and recheck.

Fig 1: Measuring Voltage Between No. 13 Terminal Of Climate Control Unit Connector B 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 unit.

Fig 2: Checking For Continuity Between No. 15 Terminal Of Climate Control Unit Connector B And Body Ground

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity? 

1. YES  - Check for loose wires or poor connections at climate control unit connector B (26P). 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.
2. NO  - Check for an open in the wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G401.