Blind spot sensor location

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

Posts: 1
Joined: 16 Nov 2020, 16:24

Blind spot sensor location

Post by Lee75 »

Hi all, need some advice my left blind spot indication doesn’t seem to work as well and my right side one!
As soon as a vehicle starts to pass me on my right the yellow indication lights up in my mirror, and stays on until the vehicle passes! Now the left side is different only comes on after I’ve passed a vehicle but only for a few seconds! No faults have come up! Just would like some information on where I can locate the sensors for the blind spot detection! Many thanks lee.

Sorry forgot to add
I have a 2016 Citroen c4 grand Picasso flair 2.0 BlueHDi 150

User avatar
Forum Admin Team
Posts: 21565
Joined: 15 Sep 2015, 19:38
x 2160

Re: Blind spot sensor location

Post by GiveMeABreak »

The blind spot monitoring doesn't have separate sensors - the system uses the parking sensors, specifically the ones on the side of the wheel arch or corner that face sideways. The unit in the wing mirror is simply the illuminated warning activated from data received by the sensors when a vehicle is overtaking or passing you.

The first thing I would do is check that the sensors are clean and not covered in any mud or grease. Be very careful with these, as they are obviously very sensitive. Check them all and give them a gentle clean.

A warning lamp appears in the door mirror on the side in question:

- immediately, when being overtaken,
- after a delay of about one second, when overtaking a vehicle slowly.