Body Control Systems: Description and Operation

Module Controlled Functions

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

The 2 multifunction electronic modules on this vehicle are the:

- Driver Seat Module (DSM)
- SJB

Driver Seat Module (DSM)

The DSM is located under the driver seat. It controls the memory functions of the driver seat position, the adjustable pedals, and the exterior rear view mirrors. The memory driver seat feature allows the driver to program 2 personalized seat/adjustable pedal/exterior mirrors position that can be recalled using the memory set switches or the Remote Keyless Entry (RKE) transmitter(s) (part of the Integrated Keyhead Transmitter (IKT) key). Refer to Locks for information on the DSM memory settings activation and deactivation.

Smart Junction Box (SJB)

NOTE: The time out for the battery saver relay and the accessory delay relay (both are controlled by the SJB) is 1 minute if the vehicle has less than 80 km (50 miles). Once the vehicle passes the approximate mileage threshold of 80 km (50 miles), the time out for both relays is 10 minutes, as described by the Owner's Literature. For the accessory delay relay, refer to Windows.

The SJB controls the following functions:

- Autolamps
- Battery saver
- Exterior lighting
- Interior lighting
- Power windows global open/close
- Power locks
- Remote Keyless Entry (RKE)
- Third row power-fold seat
- Tire Pressure Monitoring System (TPMS)
- Warning chimes and warning lamps

Post Crash Alert

The post crash alert function is controlled by the SJB. If the Restraints Control Module (RCM) determines an impact of severity enough to deploy air bags has occurred (the air bags may or may not be deployed by the RCM), the RCM will send a message to the Instrument Cluster (IC) over the High Speed Controller Area Network (HS-CAN) that an air bag deployable impact has occurred.

The IC sends the message to the SJB over the Medium Speed Controller Area Network (MS-CAN). The SJB activates the post crash alert function by repeatedly cycling the horn on 3 times, then off for 4 seconds, until the battery dies or the function is turned off. The hazard lights will also flash with the horn sounding, but will keep flashing during the horn off cycle.

The post crash alert function can be turned off by:

- pressing the hazard switch (which may need to be pressed more than once).
- pressing the RKE transmitter UNLOCK button.
- pressing the RKE transmitter PANIC button.

The post crash alert feature acts similar to the perimeter alarm, but the horn cycle is different. The perimeter alarm function cycles the horn on and off, in regular intervals until 2 minutes and 45 seconds have elapsed, the battery dies or the function is turned off. Turning the ignition to the ON position will not deactivate the post crash alert, but will deactivate an activated perimeter alarm.

The post crash alert function cannot be configured off.