Strange noise from Rav 4 Phev

[Gunner976]

Hi all

last couple of days I have heard a loud moaning noise as I manoeuvred the car out of the garage (not the wife). Didn’t last long, couldn’t hear it at normal driving speed. Anyone experienced similar? 

[Nick72]

That's to alert pedestrians. Artificial sound generated from a speaker under the bonnet I think. It's sometimes referred to as a choir of angels but more like a moaning sound like my wife makes about just about anything and everything I do.

[ernieb]

It’s a cross between Dr Who’s TARDIS and something from Star Wars.

[Devon Aygo]

There is a bulletin (TSB) from Toyota that may apply;

BE-00612T-TME

Subject:

"Train horn noise" from A/C compressor when the vehicle is started.

Area of Application:

All Markets

 

Models – Model Codes:

RAV4 Plug-in Hybrid - AXAP54 

Description of the phenomenon

Some customers may experience and report the abnormal noise, "train horn noise", immediately after the start of vehicle and air conditioner(A/C) system under cold ambient temperature (Approx. 5°C or less). This noise is caused by pulsation noise due to compression of liquid refrigerant in A/C compressor, and easier to occur at low temperatures. Tens of seconds after the occurrence, this noise will be disappeared.

Production change

The following has been changed:

• The logic of A/C ECU (AMPLIFIER ASSY , AIR CONDITIONER) was modified to improve condition of liquid compression in A/C compressor.

Production change information

 

Model	Model code	Plant	Production change effective VIN	Implementation date
RAV4 Plug-in Hybrid	AXAP54	TICO Nagakusa	JTMEB3FV5MD067051	5/10/2021

[ernieb]

I had this applied when I had the first service done in May ‘21, it still makes a noise when the temperature is low, it can be very bad.

[Cyker]

I love that it's literally described as "Train horn noise"  

Did Parts-King write that one up or something???   

[Gunner976]

Many thanks for all your responses, issue resolved.🤗