Transponder Key: Description

Fig 1: Transponder Key - Typical

Courtesy of DAIMLERCHRYSLER CORP.

1 - MOLDED CAP

2 - TRANSPONDER

3 - MOLDED CAP REMOVED

4 - SENTRY KEY

The Sentry Key Immobilizer System (SKIS) uses a transponder chip that is integral to each ignition key to communicate with the Sentry Key Immobilizer Module (SKIM). Ignition keys are supplied with the vehicle when it is shipped from the factory. The transponder chip is undermolded within the head of the key. This undermold is hidden beneath an overmolded rubber cap. See Fig 1.