SteveNorman wrote:

Crash Signal
When the restraints control module outputs any of the
fire signals, it also outputs a hard wired crash signal to
the Engine Control Module (ECM) and changes the
high speed CAN bus output message from 'no crash' to
'crash condition'. The high speed CAN bus message is
used by the Central Junction Box (CJB) and the Fuel
Fired Booster Heater (FFBH).
On receipt of the crash signals:
• The ECM disables the fuel pump.
• Operation of the FFBH is disabled.
• The CJB enters the crash mode and:
• Activates all of the unlock signals of the vehicle
locking system, even if the vehicle is already
unlocked. After 3 seconds, the CJB activates the
unlock signals again, in case a lock button is
pressed during the crash, by flailing limbs for
example.
• Ignores all locking and superlocking inputs until
the crash mode is cancelled, when it returns the
locking system to normal operation.
• Activates all of the courtesy lamps, except for the
approach lamps. The activated courtesy lamps
remain on until they are manually switched off
at the lamp unit, or the CJB crash mode is
cancelled, when they return to normal operation.
• Activates the hazard warning lamps. The hazard
warning lamps remain on until cancelled by
turning the ignition switch from position II to
position I or 0, or until the crash mode is
cancelled.
The crash mode is cancelled by cycling the ignition
switch.

matt_tdv6 wrote:

GOOD NEWS!!!!

When the airbags,sensor's & pre-tensioners are replaced then Airbag light turns off...Ive just got in from the workshop after doing pre-tensioners and giving the interior a clean and mine turned off striaght away

wiggs wrote:

Some info for ya....

The RCM (restraints control module) is installed on the top of the transmission tunnel, in line with the B pillars, and controls operation of the SRS. The main functions of the RCM (restraints control module) include:

􀁺 Crash detection and recording.
􀁺 Air bag and pretensioner firing.
􀁺 Self test and system monitoring, with status indication via the SRS (supplemental restraint system) warning lamp and non volatile storage of fault information.


A safing sensor in the RCM (restraints control module) provides confirmation of an impact to verify if air bag and pretensioner activation is necessary. A roll-over sensor monitors the lateral attitude of the vehicle. Various firing strategies
are employed by the RCM (restraints control module) to ensure that during an accident only the appropriate air bags and pretensioners are fired. The firing strategy used also depends on the inputs from the safety belt switches and the
occupant monitoring system.

An energy reserve in the RCM (restraints control module) ensures there is always a minimum of 150 milliseconds of stored energy available if the power supply from the ignition switch is disrupted during a crash. The stored energy is sufficient to produce firing signals for the driver air bag, the passenger air bag and the safety belt pretensioners.


When the ignition is switched on the RCM (restraints control module) performs a self test and then performs cyclical monitoring of the system. If a fault is detected the RCM (restraints control module) stores a related fault code and
illuminates the SRS (supplemental restraint system) warning indicator. The faults can be retrieved by T4 on a dedicated link between the RCM (restraints control module) and the diagnostic socket. If a fault that could cause a false fire signal is detected, the RCM (restraints control module) disables the respective firing circuit, and keeps it disabled during a crash event.

lad wrote:

A couple of weeks ago Buelbeast was fitting some stuff behind the centre console and removed my radio and climate control units from the centre of the dash. While they were out he showed me the car could not start, the lights came on but the engine wouldn't turn and he said it was because the units weren't in place.