Climate Control System Symptom Troubleshooting - The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work (2020 2021)

The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work

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 cooling fan is also inoperative with the A/C on. Refer to the symptom troubleshooting index .
Before doing symptom troubleshooting, check for PGM-FI DTCs .

Fuse check

-1. Check the following fuse.

Without wireless charger

Fuse	No. A23 (10 A)
Location	Under-hood fuse/relay box

With wireless charger

Fuse	No. G31 (10 A)
Location	Fuse holder A

Is the fuse OK.

YES

Go to step 2.

Without wireless charger: replace the fuse, and recheck. If the fuse blows again, repair a short in the No. A23 (10 A) fuse circuit.
With wireless charger: replace the fuse, and recheck. If the fuse blows again, repair a short in the No. G31 (10 A) fuse circuit.

A/C pressure sensor parameter check

-1. Connect the HDS to the DLC .

-2. Start the engine.

Set the A/C system to the following conditions:

A/C: ON
Fan control: ON

-4. Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
ENGINE SPEED	670-770	rpm
ECT SENSOR 1	80-100	deg.C
ECT SENSOR 1	176-212	deg.F

-5. Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
A/C PRESSURE SENSOR	196-2, 950	kPa
	2.00-30.08	kgf/cm 2
	28.4-427.9	psi

Do the current condition(s) match the threshold?

YES

Go to step 3.

Go to the A/C system test .

PGM-FI system parameter check

-1. Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
A/C SWITCH	ON
A/C CLUTCH	ON

Do the current condition(s) match the threshold?

YES

Go to step 4.

NO: A/C SWITCH is OFF

A/C SWITCH is OFF, replace the climate control unit .

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

A/C SWITCH is ON and A/C CLUTCH is OFF, check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If the symptom/indication goes away and the PCM was substituted, replace the original PCM .

A/C compressor clutch relay check
-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Remove the A/C compressor clutch relay from the under-hood fuse/relay box, and test it .

Is the relay OK?

YES

Go to step 5.

NO

Replace the A/C compressor clutch relay.

Open wire check (VMP line)

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

Test condition	Vehicle OFF (LOCK) mode
Test condition	A/C compressor clutch relay: disconnected
Test point 1	A/C compressor clutch relay 4P socket (female terminals) No. 1:
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there battery voltage?

YES

The VMP wire is OK. Go to step 6.

Repair an open in the VMP wire.

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

-1. Connect terminals A and B with a jumper wire.

Terminal A	A/C compressor clutch relay 4P socket (female terminals) No. 1:
Terminal B	A/C compressor clutch relay 4P socket (female terminals) No. 2:

Courtesy of HONDA, U.S.A., INC.

Does the A/C compressor clutch clickΩ

YES

Go to step 7.

Go to step 9.

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.

Test condition	Vehicle ON mode
Test condition	A/C compressor clutch relay: disconnected
Test point 1	A/C compressor clutch relay 4P socket (female terminals) No. 3:
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there battery voltage?

YES

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

Repair an open in the IG2 A/C wire.

Open wire check (A/C MG CLUTCH RLY CL-/ACC 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, and wait more than 1 minute.

-4. Disconnect the following connector.

PCM connector E (80P)

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

Terminal A	PCM connector E (80P) No. 31
Terminal B	Body ground

-6. Turn the vehicle to the ON mode.

Does the A/C compressor clutch clickΩ

YES

Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If the symptom/indication goes away and the PCM was substituted, replace the original PCM .

Repair an open in the A/C MG CLUTCH RLY CL-/ACC wire.

Open wire check (A/C MG CLUTCH/MG CLUTCH line)

-1. Disconnect the jumper wire.

-2. Disconnect the following connector.

A/C compressor clutch 3P connector

-3. Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	A/C compressor clutch relay: disconnected
	A/C compressor clutch 3P connector: disconnected
Test point 1	A/C compressor clutch relay 4P socket (female terminals) No. 2:
Test point 2	A/C compressor clutch 3P connector (female terminals) No. 1:

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

Is there 1.0 Ω or less?

YES

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

Repair an open in the A/C MG CLUTCH/MG CLUTCH wire.