Climate Control Power and Ground Circuit Troubleshooting

Check the No. 10 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?

YES -Go to step 2.

NO -Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 10 (7.5 A) fuse circuit.
Disconnect the climate control unit 36P and 5P connectors.
Turn the ignition switch to ON (II).
Measure the voltage between climate control unit 36P connector terminal No. 17 and body ground.

Fig 1: Measuring Voltage Between Climate Control Unit 36P Connector Terminal No. 17 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 5.

NO -Repair an open in the wire between the No. 10 (7.5 A) fuse in the under-dash fuse/relay box and the climate control unit.
Turn the ignition switch to LOCK (0).
Check for continuity between body ground and climate control unit 36P connector terminal No. 14 and climate control unit 5P connector terminal No. 3 individually.

Fig 2: Checking Continuity Between Body Ground And Climate Control Unit 36P Connector Terminal No. 14
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 3: Checking Continuity Between Body Ground And Climate Control Unit 5P Connector Terminal No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Check for loose wires and poor connections at the climate control unit 36P connector. If 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 -Check for open in the wire between the climate control unit and body ground. If the wire is OK, check for poor ground at G502 (see CONNECTOR TO FUSE/RELAY BOX INDEX ).