Climate Control Power And Ground Circuits Troubleshooting

Are the fuses OK? 

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

Fig 1: Checking Voltage At Climate Control Unit Connector A (12P)

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 under-dash fuse/relay box and the climate control unit.

Fig 2: Checking Voltage At Climate Control Unit Connector A (12P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage? 

1. YES  -Go to step 7.
2. NO  -Repair open in the wire between the No. 13 fuse in the passenger's under-dash fuse/relay box and the climate control unit.

Fig 3: Checking Continuity Between No. 3 Terminal Of Climate Control Unit Connector A (12P) 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 A (12P). 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.