Multiple protocol reception and differentiation

1. A method of determining transmission origin comprising the steps of:

receiving one of a first transmission including a first number of data bits from a first origin for a first system or a second separate transmission including a second number of data bits from a second origin for a second system with a receiver, wherein each of the first transmission and the second transmission are of a common protocol;

determining an origin of the received transmission with a controller associated with the receiver based on the total number of data bits contained in the received transmission after receipt of all of the received transmission; and

forwarding the received data bits to one of the first and second systems responsive to the determination of origin.

2. The method as recited in claim 1 , wherein the first number of data bits is different than the second number of data bits.

3. The method as recited in claim 1 , wherein the first transmission originates from a tire pressure monitoring system and the second transmission originates from a remote keyless entry system.

4. The method as recited in claim 1 , wherein the determination of origin occurs upon completion of receipt of one of the first transmission and the second transmission.

5. The method as recited in claim 1 , wherein the receiver comprises one receiver for receiving the first transmission and the second transmission.

6. The method as recited in claim 5 , wherein the receiver considers the first transmission and the second transmission the same until one of the first and second transmissions are complete.

7. The method as recited in claim 1 , further including receiving a third transmission including a third length of data bits, and the step of determining that the third transmission originates from a third system is responsive to the third number of data bits.

8. A receiver assembly for communicating with a plurality of vehicle systems, the receiver assembly comprising:

a receiver capable of receiving at least a first transmission from a first system and a second transmission from a second system, wherein each of the first transmission and the second transmission are of a common protocol; and

a controller operating the receiver and determining an origin of a received transmission responsive to a number of data bits contained in the received transmission after receipt of the entire received transmission.

9. The assembly as recited in claim 8 , wherein the first transmission includes a first number of data bits and the second transmission includes a second number of data bits different than the first number of data bits.

10. The assembly as recited in claim 8 , wherein the first system comprises a tire pressure monitoring system and the second system comprises a remote keyless entry system.

11. The assembly as recited in claim 8 , further including the receiver capable of receiving a third transmission having a protocol common with the first and second transmissions from a third system, wherein the third transmission includes a third number of data bits different than both the first transmission and the second transmission.

12. The assembly as recited in claim 8 , wherein the controller forwards the transmission to one of the first system and the second system responsive to the determination of the origin.

13. The assembly as recited in claim 8 , wherein the receiver is adapted to receive both the first transmission and the second transmission.

14. The assembly as recited in claim 13 , wherein the receiver cycles between receipt of the first transmission and receipt of the second transmission.