Citroen C5 Aircross Quiz
Power supply

Sleep / wake-up of the VAN network control modules

In this manual: Power supply
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
~3min read

To reduce the electrical consumption of the control modules, their power supply may be interrupted.

Note: CAN network control modules are no longer powered when +APC disappears. The CAN network control modules are powered when +APC appears.

The BSI manages the sleep and wake-up of the control modules (by extension, the sleep or wake-up of the network). The consequences are transparent to the user and during diagnosis with the diagnostic tool.

Le schéma ci dessous représente un calculateur type et ses

The diagram below shows a typical control module and its external power supplies, as well as an external actuator capable of waking up the network (example: hazard warning light pushbutton).

Alimentation électrique des réseaux réveillés

Power supply of woken networks

The +VAN from the BSI supplies the power switching stage of the control modules. The permanent + is switched and can then supply the various electronic stages of the control modules.

Note: Not all control modules are supplied with a permanent +.

The power supply is then made directly from +VAN.

Power supply of networks in sleep mode

When the networks are in sleep mode, the BSI interrupts the +VAN of the control modules. The power switching stage of the control modules is no longer supplied. The permanent + can no longer supply the electronic stages of the control modules. The electronic stages of the control modules are no longer supplied, and their electrical consumption is zero. The BSI sets the electrical potential of DATA B to 12 volts. The BSI also goes into sleep mode.

Conditions for network sleep

The networks go to sleep one minute after the conditions are met.

Conditions de mise en veille des réseaux

Degraded mode

In the event of a short circuit between DATA B and ground, the information on DATA B is interpreted by the BSI as a network wake-up request. This is why, after six unjustified sleep and wake-up attempts, the BSI forces the network to sleep. +VAN disappears and reappears with +APC.

Conditions for network wake-up

An action on the actuator causes a current draw on the DATA B link. The BSI interprets this current draw. The BSI then re-powers +VAN. The control modules become functional again.

Not all external actuators connected to the control modules have the ability to wake up the network.

CONTROL MODULES WAKING UP THE VAN NETWORKS
Com 2000 via the high-frequency receiver (location, locking/unlocking, window lifting), parking light request, optical call and horn.
Anti-theft alarm ECU.
Instrument cluster via the hazard warning button.
Car radio via its on/off button.

An action on an external BSI actuator wakes up the network. The BSI then re-powers the ECUs on the + van line.

Nota : Le réveil et la mise en veille du réseau sont

Note: Network wake-up and sleep are simultaneous for all ECUs.

Test yourself

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