Citroen C5 Aircross Quiz
Exterior lighting / signalling

Light sensor

In this manual: Exterior lighting / signalling
AAS - Parking Aid — 8Owner's Manual Citroën C5 II — 139Citroen C5 Aircross (2017- 2024) - Owner's Manual — 143Audio system — 14Overspeed control — 7Multifunction display — 4Driver information instrument cluster — 20Navigation assistance — 8Intruder alarm — 7Mechanical specifications — 9Power supply — 8Electrical equipment — 13Lighting and electrical equipment — 3Immobiliser — 4Sunroof — 10Exterior lighting / signalling — 38Multiplexing — 7Air conditioning — 7Body — 6General specifications — 9Automatic gearbox control — 3Exterior mirrors — 10Airbags — 5Defrost — 6Underinflation — 6Interior lighting — 4Wipers / Washers — 6Window lifters — 11Cooling — 8Opening management — 7Cruise control — 5Suspension — 4Grip management — 1Paint — 2Exterior lighting control — 1Indicators (turn signals) — 1Automatic lighting systems - General recommendations — 1Wiper control — 1Special position of the front wipers — 1
~2min read

The light sensor consists of the following components:

  • an upward-facing photodiode,
  • a forward-facing photodiode,
  • signal conditioning electronics,
  • a connector base.

The system ignores any tint on the windscreen. Replacing a windscreen with the same part reference does not affect the function of the system and does not change its characteristics in any way.

The light sensor is directly connected to the BSI, which centralises all the information required to manage the automatic headlamp function.

The light sensor can be fitted and removed. A right / left polarisation feature ensures the light sensor is positioned correctly.

Note: The light sensor clips onto a mounting ring located on the windscreen. It is of the one-piece type and cannot be repaired.

CODABLE PARAMETERS

The list of codable parameters is described in the table below:

  • automatic lighting option,
  • dipped and main beam in the same headlamp,
  • front fog lamp presence,
  • fog lamps and headlamp in the same unit,
  • daytime running lights,
  • automatic hazard warning lights on impact,
  • automatic hazard warning lights on hard braking.

FAULT READING

The following faults can be read using the diagnostic tool:

  • Right turn signal lighting fault
  • Left turn signal lighting fault
  • Tunnel brightness measurement fault
  • Dusk brightness measurement fault
  • Rear fog lamp control fault

ACTUATOR TEST

The following tests can be carried out using the diagnostic tool:

  • Rear fog lamp control
  • Right turn signal control
  • Left turn signal control
  • Horn control
  • Codes control
  • Headlamp control
  • Rear right light control
  • Rear left light control
  • Front right light control
  • Front left light control

Test yourself

A quick Citroen C5 Aircross quiz: every answer comes with an explanation and a link to the manual page.