Specifications

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Testing Testing Immobilizer (EWS) Systems
Vehicle Keys
Non-electronic, mechanical keys with a separate keyless entry remote button were used up to
about 1994.
Starting in about 1995 (EWS II), each BMW was delivered to the new owner with four electronic
keys. There are two Master Keys, one spare emergency wallet key and one valet key. The two
master keys contain the radio transmitters for keyless entry, burglar alarm, and key memory
functions. All keys contain the electronic chip for EWS transponder signaling to start the vehicle.
BMW has four different key types, described in the following sections.
Key Type #1
Early keys have no remote keyless entry function, which is a separate button attachment.
Figure 4-9 Key type #1
Key Type #2
This key type has three buttons and an LED, as well as a replaceable internal battery. Key type #2
contains four keys (Figure 4-10).
1— Master keys
2— Spare emergency wallet key
3— Valet key—does not open the glove box or trunk
Figure 4-10 Key type #2
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