Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

What to Do When a Citroen BSI Unit Fails to Send Power Due to Cold Weather

Model: Citroen C4 MK 1 - Years: 2004, 2005, 2006, 2007, 2008, 2009, 2010
Part: Control unit

See other generations:
Video tutorial

In this video, we see how the Citroen C4 of our YouTuber has trouble starting on a snowy winter day. We can understand the reason. Inside, the dashboard does not light up, and since it is a vehicle with a lot of electronics, we know that everything is controlled by a unit called BSI in Citroen, which our YouTuber has already disconnected.

This unit, when very cold, fails to send commands to other components, and usually, bringing it indoors to warm it up is enough to get it working again. However, in this case, the best solution is to replace it, as this workaround has been done too many times.


Updated on 9 September 2026 by ScegliAuto


Related tutorials

How to Reset the BSI Unit on a Citroën C4?
How to Reset the BSI Unit on a Citroën C4?
Citroen C4 (2004-2010 / MK 1) The procedure to reset the BSI unit on a Citroën C4 involves connecting a diagnostic tool to the vehicle's OBD port, located at the bottom left of th…
How to Reset the BSI Unit on a Citroën C5?
How to Reset the BSI Unit on a Citroën C5?
Citroen C4 (2004-2010 / MK 1) To reset the BSI unit on a Citroën C4, connect a diagnostic tool to the vehicle's OBD port, located on the lower left side of the dashboard near the …
How to reset the BSI unit of the Citroën C4?
How to reset the BSI unit of the Citroën C4?
Citroen C4 (2010-2018 / MK 2) To reset the BSI unit of the Citroën C5, connect a diagnostic tool to the vehicle's OBD port: this will be located on the lower left side of the dash…

How to Reset the Tyre Pressure Warning Light on a Kia Rio?

The tyre pressure warning light displayed on the instrument cluster of the Kia Rio can be reset by inflating the tyres until they reach the recommended pressure value: this value is indicated on the sticker affixed to the driver's door pillar. Once all tyres have been inflated to the recommended pressure, turn on the ignition to check that the light has disappeared: if it is still present, it may be necessary to drive for a few miles, allowing the sensors to work and thus turning off the light.

Watch the video!


by ScegliAuto

More videos