Honda HR-V: A/C Compressor Clutch Circuit Troubleshooting (KA/KX)

NOTE:

• It is normal for the A/C compressor to turn off under certain conditions, such as low idle, high engine coolant temperature, or hard acceleration.
• Do not use this troubleshooting procedure if the fans are also inoperative with the A/C on. Refer to the symptom troubleshooting index - Refer to: Heating and A/C Systems Symptom Troubleshooting Index (Heating/Air Conditioning), or Climate Control System Symptom Troubleshooting Index (Climate Control).
• Before doing symptom troubleshooting, check for PGM-FI DTCs - Refer to: How to Troubleshoot the Fuel and Emissions Systems, or How to Troubleshoot the CVT System (CVT).

1. A/C pressure sensor performance check:

1. Connect the HDS to the DLC.
2. Start the engine.
3. Set the A/C icon and the fan control icon to ON.
4. Check the parameter(s) below with the HDS.

Do the current condition(s) match the threshold?

YES

Go to step 2.

NO

Go to the A/C system test.

2. PGM-FI system parameter check:

Check the parameter(s) below with the HDS.

Do the current condition(s) match the threshold?

YES

Go to step 3.

NO: A/C SWITCH is OFF

Replace the HVAC control unit.

NO: A/C SWITCH is ON and A/C CLUCH is OFF

Update the PCM if it does not have the latest software or substitute a known-good PCM, and recheck.

3. Fuse check:

1. Turn the vehicle to the OFF (LOCK) mode.
2. Check the following fuse.

Is the fuse OK?

YES

Go to step 4.

NO

Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. B14 (7.5 A) fuse circuit.

4. A/C compressor clutch relay check:

Remove the A/C compressor clutch relay from the auxiliary under-hood relay box A, and test it.

Is the relay OK?

YES

Go to step 5.

NO

Replace the A/C compressor clutch relay.

5. Open wire check (+B MG CLUTCH line):

Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

The +B MG CLUTCH wire is OK. Go to step 6.

NO

Repair an open in the wire between the No. B14 (7.5 A) fuse in the under-hood fuse/relay box and the A/C compressor clutch relay. If the wire is OK, replace the under-hood fuse/relay box.

6. Determine possible failure area (A/C compressor clutch relay switch side circuit, A/C compressor clutch relay coil side circuit):

Connect terminals A and B with a jumper wire.

Does the A/C compressor clutch click?

YES

Go to step 7.

NO

Go to step 9.

7. Open wire check (IG2 A/C line):

1. Disconnect the jumper wire.
2. Turn the vehicle to the ON mode.
3. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

The IG2 A/C wire is OK. Go to step 8.

NO

Repair an open in the wire between the A/C compressor clutch relay and the No. C24 (7.5 A) fuse in the under-dash fuse/relay box.

8. Open wire check (A/C MG CLUTCH RLY CL- line):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Reinstall the A/C compressor clutch relay.
3. Jump the SCS line with the HDS.

NOTE: This step must be done to protect the PCM from damage.

4. Disconnect the following connector.

PCM connector A (51P)

5. Connect terminals A and B with a jumper wire.

6. Turn the vehicle to the ON mode.

Does the A/C compressor clutch click?

YES

Update the PCM if it does not have the latest software or substitute a known-good PCM, and recheck.

NO

Repair an open in the wire between the A/C compressor clutch relay and the PCM.

9. Open wire check (A/C MG CLUTCH line):

1. Disconnect the following connector.

A/C compressor clutch 1P connector

2. Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

The A/C MG CLUTCH wire is OK. Check the A/C compressor clutch clearance and the A/C compressor clutch field coil. Repair as needed.

NO

Repair an open in the wire between the A/C compressor clutch relay and the A/C compressor clutch.

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