Chrysler Goes Wireless

Posted 12/10/2009
By Tom Vadnais

Chrysler's newer vehicles have gone wireless. One of the new systems is the wireless ignition node (WIN). This system uses a transponder remote keyless entry fob integrated key (FOBIK), which replaces the traditional metal key. With all of the functions of a traditional remote keyless entry, this unit also has a metal key blade for valet functions to lock the glove box and to open the door in the event of a dead battery, a remote keyless entry failure or a bus failure. This unit serves as the remote keyless entry fob and the electronic ignition key.

The functions of the WIN are:

• Sentry key immobilizer (SKIM)

• Wireless receiver for remote keyless entry

• Brake transmission interlock (BTSI)

• Clock master

• Steering column lock interface (BUX) for export only

• Tire pressure monitor (TPM) system

• Remote starting

• Electronic ignition switch

When entering the vehicle, the FOBIK is used to open the door locks and disarm the alarm system via the remote keyless entry. The FOBIK is then inserted into the WIN, much like an ignition key. But the similarity ends there. When the FOBIK is near the WIN, it transmits a secret key code via radio frequency to the WIN, which in turn passes this information on to the controller area network (CAN). The WIN is hard-wired to the CAN C bus. The signal is then sent to the powertrain control module (PCM). At this point, if it is a valid key, the immobilizer is satisfied, and the vehicle is ready to start. The signal is then passed through the central gateway on the vehicle, usually the totally integrated power module (TIPM).

This information is then gathered by the other controllers via the CAN B, the CAN interior high speed (IHS) or, in some cases, the local interconnect network (LIN) bus. Once the FOBIK is turned to the "start" position in the WIN, the WIN again transmits a message on the CAN bus for starter engagement and when it returns to the run position, the "ignition on" functions through the PCM and the central gateway to the other modules. The WIN then monitors the tire pressures over the bus and provides the Brake Transmission Shift Interlock (BTSI) function via a hard-wired input from the shifter assembly and brake switch.

The system became available on some 2007 vehicles and standard on all Chrysler, Dodge and Jeep vehicles by 2009.

Tom Vadnais is an Identifix Chrysler specialist. He is ASE Master with L1 and A/C Recovery and Recycling certifications.

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