Honda Accord: HVAC Control Power and Ground
Circuit Troubleshooting - Heating/Air Conditioning - Heating, Ventilation, and Air Conditioning - Honda Accord MK8 2008-2012 Service ManualHonda Accord: HVAC Control Power and Ground Circuit Troubleshooting

1. 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 blows again, check for a short in the No. 16 (7.5 A) fuse circuit.

2. Disconnect the HVAC control unit 24P connector.

3. Turn the ignition switch to ON (II).

4. Measure the voltage between HVAC control unit 24P connector terminal No. 11 and body ground.

HVAC CONTROL UNIT 24P CONNECTOR

Wire side of female terminals


Wire side of female terminals

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 HVAC control unit.

5. Turn the ignition switch to LOCK (0).

6. Check for continuity between HVAC control unit 24P connector terminal No. 23 and body ground.

HVAC CONTROL UNIT 24P CONNECTOR

Wire side of female terminals


Wire side of female terminals

Is there continuity? YES

-Check for loose wires or poor connections at the HVAC control unit 24P connector. If the connections are good, substitute a known-good HVAC control unit (see page 21-65), and recheck.

NO

-Check for an open in the wire between the HVAC control unit and body ground. If the wire is OK, check for poor ground at G401 (see page 22-40).

    Recirculation Control Motor Circuit Troubleshooting
    908-09 models 4-door with A/T and '10 model with AT 1. 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 re ...

    A/C Condenser Fan Circuit Troubleshooting
    NOTE: • Do not use this troubleshooting procedure if the radiator fan and/or the A/C compressor is inoperative. Refer to the symptom troubleshooting index. • Before doing symptom tro ...

    See also:

    Throttle Body Test
    Carbon Accumulation Check NOTE: If the malfunction indicator lamp (MIL) has been reported on, check for diagnostic trouble codes (DTCs). 1. Connect the HDS to the data link connector (DLC) (A) l ...

    How to Use This Manual
    This manual is divided into multiple sections, The first page of each section is marked with a black tab that lines up with its corresponding thumb index tab on this page and the back cover. You ...

    Self-diagnostic Function
    NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see page 22-134). The gauge control module has a self-diagnostic functio ...