Climate Control Power and Ground Circuit Troubleshooting
- Check the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Is the fuse OK?
YES -Go to step 2.
NO -Replace the fuse, and recheck. If the fuse blow again, check for a short in the No. 16 (7.5 A) fuse circuit.
- Disconnect climate control unit connector A (28P).
- Turn the ignition switch to ON (II).
- Measure the voltage between climate control unit connector A (28P) terminal No. 9 and body ground.Fig 1: Measuring Voltage Between Climate Control Unit Connector A (28P) Terminal No. 9 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. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box and the climate control unit.
- Turn the ignition switch to LOCK (0).
- Disconnect climate control unit connector B (12P).
- Check for continuity between climate control unit connector B (12P) terminal No. 3 and body ground.Fig 2: Checking Continuity Between Climate Control Unit Connector B (12P) Terminal No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Check for loose wires or poor connections at climate control unit connector B (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 (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ).
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; with navigation (see AUDIO WIRE HARNESS (WITH NAVIGATION) ), without navigation (see AUDIO WIRE HARNESS (WITHOUT NAVIGATION) ).