Sentry Key Immobilizer System

WARNING: This page is about a different car, the 2002 Dodge Grand Caravan, 2002 Dodge Caravan, 2002 Chrysler Voyager, and 2002 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.

The Sentry Key Immobilizer System (SKIS) is available as a factory-installed option on this vehicle. It is designed to provide passive protection against unauthorized vehicle use by disabling the engine, after 2 seconds of running, whenever an invalid key is used to start the vehicle. The SKIS is active whenever the ignition is on and does not require any customer intervention. The primary components of the system are the Sentry Key Immobilizer Module (SKIM), Sentry Key (ignition key with a transponder molded into the head), indicator light, Body Control Module (BCM), and the Powertrain Control Module (PCM). The SKIM is mounted to the steering column with the molded, integral antenna mounted on the ignition housing. The indicator light, is located in the message center.

Fig 1: Identifying Sentry Key Immobilizer System Components

Courtesy of DAIMLERCHRYSLER CORP.

The SKIS includes keys from the factory which are preprogrammed. Each SKIM will recognize a maximum of 8 Sentry Keys. If the customer would like to own additional keys other than those provided with the vehicle, they can be purchased from any authorized dealer. These keys must be programmed to the SKIM on the vehicle in order for the system to recognize them as valid keys. This can be done by the dealer with a DRB-III(R) scan tool or by a customer if this feature is available in their market and they have 2 valid keys already available to them. The SKIS performs a self-test each time the ignition switch is turned to the ON position and will store Diagnostic Trouble Codes (DTC's) if a system malfunction is detected. The SKIS can be diagnosed and any stored DTC's can be retrieved using a DRB-III(R) scan tool.

If Sentry Key Immobilizer Module (SKIM) is replaced, unique "Secret Key" data must be transferred from SKIM to Powertrain Control Module (PCM). This procedure requires SKIM to be placed in SECURED ACCESS mode using 4-digit vehicle Personal Identification Number (PIN) code.

If PCM and SKIM are replaced at the same time, program VIN into PCM first. All vehicle keys will need to be replaced and programmed into new SKIM. SECURED ACCESS mode is not required to check programmed status of key.

If 3 attempts are made to enter SECURED ACCESS mode using an incorrect PIN code, SECURED ACCESS mode will be locked out for one hour. To exit lock out mode, turn ignition on continuously for one hour then enter the correct PIN code. Ensure all accessories are turned off. Monitor battery state and connect battery charger if necessary.

To program smart keys using "customer programming method" requires 2 valid smart keys. See USING CUSTOMER LEARN PROGRAMMING METHOD under PROGRAMMING SENTRY KEYS.