Grand Cherokee 4WD V8-4.7L Flex Fuel (2009)
Ignition Switch: Description and Operation
Wireless Ignition Node Receiver - Description
DESCRIPTION
This vehicle is equipped with a Wireless Ignition Node (WIN) (1). The WIN, along with the FOB with Integrated Key (FOBIK) are the primary
components of the keyless ignition system. The only visible component of the WIN is the ignition switch (5) located on the face of the instrument panel
just to the inboard side of the steering column. The remainder of the WIN including its mounting provisions and electrical connections are concealed
within the instrument panel.
The WIN housing is constructed of molded black plastic and includes four integral mounting bosses (4) , which are secured to the instrument panel
structure with screws. Two connector receptacles are integral to the back of the switch housing. One (3) connects the WIN to the vehicle electrical
system through a dedicated takeout and connector of the instrument panel wire harness. The other (2) is a dedicated connector for the coaxial cable input
from the optional remote start system external antenna module.
In addition to replacing a conventional keyed ignition switch, the WIN is an integrated electronic receiver that serves as the base station in the vehicle. It
communicates with other electronic modules in the vehicle over the Controller Area Network (CAN) data bus.
The WIN interfaces with the Remote Keyless Entry (RKE) FOBIK and the Tire Pressure Monitor (TPM) sensors (if equipped) using Radio Frequency
(RF) communication, with the Immobilizer System (theft) transponder within the FOBIK using Low Frequency (LF) RF communication. It also
communicates with the TPM trigger transponders (if equipped) and electronic shaft lock module (if equipped) using a Local Interface Network (LIN)
data bus connection.
The WIN provides a switched 12-volt source through an isolated switch for the electronic shaft lock module required for certain export market vehicles
and contains a key removal inhibit solenoid, an electronic Brake Transmission Shift Interlock (BTSI) solenoid, a key-in warning contact and it serves as
the real time vehicle clock by transmitting the clock information to other electronic modules over the CAN data bus.
The WIN cannot be adjusted or repaired, but is flash update capable. If ineffective or damaged the entire WIN must be replaced See: Service and
Repair/Wireless Ignition Node Receiver - Removal.
