Crash Signal

When the RCM outputs any of the fire signals it also outputs a crash signal to the Body Control Module/Gateway Module (BCM/GWM) assembly on the High Speed (HS) Controller Area Network (CAN) chassis systems bus.

The crash signal is also hardwired to:

• The Powertrain Control Module (PCM).
• The Body Control Module/Gateway Module (BCM/GWM) assembly.
• All door module.
• Telematics Control Module (TCU) - If equipped.
• The Battery Energy Control Module (BECM) - If equipped.

On receipt of the crash signal, the PCM cuts the power supply to the fuel pump relay and the BCM/GWM assembly switches into crash mode.

In the crash mode, the BCM/GWM assembly:

• Activates all of the unlock signals of the vehicle locking system, even if the vehicle is already unlocked.
• Ignores all locking/superlocking inputs until it receives an unlock input, when it returns the locking system to normal operation.
• Activates the interior lamps. The interior lamps remain on permanently until they are manually switched off at the lamp unit, or the crash mode is switched off and they return to normal operation.
• Disables the rear window child lock input until the crash mode is switched off.
• Activates the hazard warning lamps. The hazard warning lamps remain on until cancelled by the hazard warning switch or the crash mode is switched off.

The BCM/GWM assembly crash mode is switched off by a valid locking and unlocking cycle of the locking system.