Crash Signal

When the RCM outputs any of the fire signals it also outputs a crash signal to the RJB and the Engine Control Module (ECM) on the High speed Controller Area Network (CAN). The crash signal is also hardwired to the ECM and the RJB. The instrument cluster picks up the crash signal from the High speed CAN and gateways it to the Lighting Control Module (LCM). On receipt of the crash signal, the RJB goes into a crash mode and the ECM cuts the power supply to the fuel pump relay. In the crash mode, the RJB:

• Activates all of the unlock signals of the vehicle locking system, even if the vehicle is already unlocked.
• Ignores all locking/super locking 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 RJB 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.
• Sends a crash message to the LCM, to activate the hazard flashers. The hazard flashers remain on until cancelled by the hazard warning switch or the crash mode is switched off.

The RJB crash mode is switched off by a valid locking and unlocking cycle of the locking system.