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 vehicle can be equipped with either 3 multifunction electronic modules (Passive Anti-Theft System (PATS)) or with 4 multifunction electronic modules (PATS with push button start):

- Driver Door Module (DDM)
- Driver Seat Module (DSM)
- SJB
- Remote Function Actuator (RFA) module (PATS with push button start) (if equipped)

Driver Door Module (DDM)

The DDM (located in the driver door) allows the driver to program a personalized seat position that can be recalled using the memory set switch or a Remote Keyless Entry (RKE) transmitter. The RKE transmitter is either part of the Integrated Keyhead Transmitter (IKT) (PATS only) or part of the IA key (push button start).

In addition to the position of the driver exterior mirror, the DDM also indirectly controls the position of the passenger exterior mirror and the adjustable pedals. The DDM is hardwired to the power mirror switch, driver mirror, memory set switch and sends messages over the Medium Speed Controller Area Network (MS-CAN) to the DSM to adjust the passenger exterior mirror and the adjustable pedals. Refer to Brakes and Traction Control for information on the adjustable pedals. Refer to Mirrors for information on the exterior mirrors.

Driver Seat Module (DSM)

The DSM (located under the driver seat) controls the user selected comfort functions. These functions are the memory seat, memory passenger exterior mirror and memory pedals. Up to 2 personal settings can be programmed into the DSM memory and when selected, the DSM returns the user adjustable features to the programmed positions. For programming the memory feature, refer to Doors, Hood and Trunk &/or Locks.

Remote Function Actuator (RFA) Module

The RFA module (if equipped) (located behind the glove compartment) receives inputs from/controls the components/systems listed below:

- Backup transceiver (located in the glove compartment)
- Initial engagement of the starter
- IA
- Keyless entry keypad
- Luggage compartment lid ajar switch (located in the luggage compartment lid latch)
- Luggage compartment lid latch release
- Passive start antenna, console (front)
- Passive start antenna, console (rear)
- Passive start antenna, seat (rear)
- PATS
- Perimeter anti-theft
- Power door locks (including smart locks, autolocking and luggage compartment lid release)
- Remote Functions Receiver (RFR) module (located above the headliner near the RH visor)
- Start/stop switch (located in the instrument panel, right of the steering column)

The RFA module (PATS with push button start) includes some of the functions that usually are controlled by the SJB on vehicles with PATS only. The IA system is also contained in the RFA module. Refer to Doors, Hood and Trunk &/or Locks.

Smart Junction Box (SJB)

NOTE: The time out for the SJB controlled battery saver relay and the accessory delay relay 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 in the Owner's Literature. For the battery saver relay, refer to Lighting and Horns. For the accessory delay relay, refer to Windows and Glass.

The SJB (located under the instrument panel, left of the steering column) is a combination of a multifunction electronic module and a fuse panel. The following systems are controlled by the SJB:

- Accessory delay relay
- Battery saver relay
- Exterior lighting
- Interior lighting
- Heated rear window
- Horn
- Perimeter anti-theft
- Post crash alert
- Power door locks (including smart locks, autolocking and luggage compartment lid release)
- RKE/keyless entry keypad
- Tire Pressure Monitoring System (TPMS)

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 the air bags has occurred, the RCM sends a message to the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN), which in turn sends a message to the SJB over the Medium Speed Controller Area Network (MS-CAN).

The SJB activates the post crash alert function by sounding the horn 3 times, then off for 4 seconds, then on 3 times, etc., until the battery dies or the function is turned off. The hazard lamps also flash with the horn sounding, however, the hazard lamps keep flashing during the horn off cycle.

The post crash alert function can be turned off by:

- pressing the hazard switch (may need to be pressed more than once).
- pressing the IKT key (PATS only), or the IA key (PATS with push button start) UNLOCK button.
- pressing the IKT key (PATS only) or the IA key (PATS with push button start) key PANIC button.

This feature acts similar to the perimeter alarm except for the horn cycle rate. The perimeter alarm function sounds the horn on and off, in regular intervals until 2 minutes and 45 seconds have elapsed, the battery dies or the function is deactivated. Turning the ignition to the ON position does not deactivate the post crash alert function, but deactivates an activated perimeter alarm.

The post crash alert function cannot be configured off.

Welcome/Farewell Strategy

The welcome/farewell strategy controlled by the SJB. Please refer to the table below for specific Welcome/Farewell strategy features.

Welcome/Farewell Strategy Features