Jeep Grand Cherokee WK. Manual - part 694

TRANSPONDER KEY

DESCRIPTION

Each ignition key (2) used in the Sentry Key Immobi-
lizer System (SKIS) has a transponder chip included
on the circuit board (4) beneath the cover (1) of the
integral Remote Keyless Entry (RKE) transmitter (3).
In addition to having to be cut to match the mechani-
cal coding of the ignition lock cylinder and pro-
grammed for operation of the RKE system, each new
Sentry Key has a unique transponder identification
code that is permanently programmed into it by the
manufacturer, and which must be programmed into
the Sentry Key REmote Entry Module (SKREEM) to
be recognized by the SKIS as a valid key. The Sentry
Key transponder cannot be adjusted or repaired. If
faulty or damaged, the entire key and RKE transmitter
unit must be replaced.

OPERATION

When the ignition switch is turned to the On position, the Sentry Key REmote Entry Module (SKREEM) communi-
cates through its antenna with the Sentry Key transponder using a Radio Frequency (RF) signal. The SKREEM then
listens for a RF response from the transponder through the same antenna. The Sentry Key transponder chip is
within the range of the SKREEM transceiver antenna ring when it is inserted into the ignition lock cylinder. The
SKREEM determines whether a valid key is present in the ignition lock cylinder based upon the response from the
transponder. If a valid key is detected, that fact is communicated by the SKREEM to the Powertrain Control Module
(PCM) over the Controller Area Network (CAN) data bus, and the PCM allows the engine to continue running. If the
PCM receives an invalid key message, or receives no message from the SKREEM over the CAN data bus, the
engine will be disabled after about two seconds of operation. The ElectroMechanical Instrument Cluster (EMIC) will
also respond to the invalid key message on the CAN data bus by flashing the security indicator on and off.

Each Sentry Key has a unique transponder identification code permanently programmed into it by the manufacturer.
Likewise, the SKREEM has a unique Secret Key code programmed into it by the manufacturer. When a Sentry Key
is programmed into the memory of the SKREEM, the SKREEM stores the transponder identification code from the
Sentry Key, and the Sentry Key learns the Secret Key code from the SKREEM. Once the Sentry Key learns the
Secret Key code of the SKREEM, it is permanently stored in the memory of the transponder. Therefore, once a
Sentry Key has been programmed to a particular vehicle, it cannot be used on any other vehicle (Refer to 8 -
ELECTRICAL/VEHICLE THEFT SECURITY/TRANSPONDER KEY - STANDARD PROCEDURE - TRANSPONDER
PROGRAMMING).

The SKIS performs a self-test each time the ignition switch is turned to the On position, and will store key-related
fault information in the form of a Diagnostic Trouble Code (DTC) in SKREEM memory if a Sentry Key transponder
problem is detected. The Sentry Key transponder chip can be diagnosed, and any stored DTC can be retrieved
using a diagnostic scan tool. Refer to the appropriate diagnostic information.

STANDARD PROCEDURE

SENTRY KEY TRANSPONDER PROGRAMMING

All Sentry Keys included with the vehicle are pre-programmed to work with the Sentry Key Immobilizer System
(SKIS) when it is shipped from the factory. The Sentry Key REmote Entry Module (SKREEM) can be programmed
to recognize up to a total of eight Sentry Keys. When programming a blank Sentry Key transponder, the key must
first be cut to match the ignition switch lock cylinder in the vehicle for which it will be used. Once the additional or
new key has been cut, the SKREEM must be programmed to recognize it as a valid key. There are two possible

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VEHICLE THEFT SECURITY - SERVICE INFORMATION

methods to program the SKREEM to recognize a new or additional valid key, the Secured Access Method and the
Customer Learn Method. Following are the details of these two programming methods.

SECURED ACCESS METHOD

The Secured Access method applies to all vehicles. This method requires the use of a diagnostic scan tool. This
method will also require that you have access to the unique four-digit PIN code that was assigned to the original
SKREEM. The PIN code must be used to enter the Secured Access Mode in the SKREEM. This PIN number may
be obtained from the vehicle owner, from the original vehicle invoice, or from the DaimlerChrysler Customer Center.
Refer to the appropriate diagnostic information for the proper Secured Access method programming procedures.

CUSTOMER LEARN METHOD

The Customer Learn feature is only available on domestic vehicles, or those vehicles which have a U.S. country
code designator. This programming method also requires access to at least two valid Sentry Keys. If two valid Sen-
try Keys are not available, or if the vehicle does not have a U.S. country code designator, the Secured Access
Method must be used to program new or additional valid keys to the SKREEM. The Customer Learn programming
method procedures are as follows:

1. Obtain the blank Sentry Key(s) that are to be programmed as valid keys for the vehicle. Cut the blank key(s) to

match the ignition switch lock cylinder mechanical key codes.

2. Insert one of the two valid Sentry Keys into the ignition switch and turn the ignition switch to the On position.

3. After the ignition switch has been in the On position for longer than three seconds, but no more than fifteen

seconds, cycle the ignition switch back to the Off position. Replace the first valid Sentry Key in the ignition switch
lock cylinder with the second valid Sentry Key and turn the ignition switch back to the On position. The second
valid Sentry Key must be inserted in the lock cylinder within fifteen seconds of removing the first valid key.

4. About ten seconds after the completion of Step 3, the security indicator in the instrument cluster will start to flash

to indicate that the system has entered the Customer Learn programming mode.

5. Within sixty seconds of entering the Customer Learn programming mode, turn the ignition switch to the Off posi-

tion, replace the valid Sentry Key with a blank Sentry Key transponder, and turn the ignition switch back to the
On position.

6. About ten seconds after the completion of Step 5, the security indicator will stop flashing, stay on solid for three

seconds, then turn off to indicate that the blank Sentry Key has been successfully programmed. The SKIS will
immediately exit the Customer Learn programming mode. After the ignition is cycled the vehicle may be started
using the newly programmed valid Sentry Key.

Each of these steps must be repeated and completed in their entirety for each additional Sentry Key that is to be
programmed. If the above steps are not completed in the given sequence, or within the allotted time, the SKREEM
will exit the Customer Learn programming mode and the programming will be unsuccessful. The SKREEM will also
automatically exit the Customer Learn programming mode if it sees a non-blank Sentry Key transponder when it
should see a blank, if it has already programmed eight (8) valid Sentry Keys, or if the ignition switch is turned to the
Off position for more than about fifty seconds.

NOTE: If an attempt is made to start the vehicle while in the Customer Learn mode (security indicator flash-
ing), the SKIS will respond as though the vehicle were being started with an invalid key. In other words, the
engine will stall after about two seconds of operation. No faults will be set.

NOTE: Once a Sentry Key has been programmed as a valid key to a vehicle, it cannot be programmed as a
valid key for use on any other vehicle.

VTSS/SKIS INDICATOR

DESCRIPTION

A Vehicle Theft Security System (VTSS) / Sentry Key Immobilizer System (SKIS) indicator is standard equipment on
all instrument clusters, but is only functional on vehicles equipped with the optional VTSS/SKIS. The amber VTSS/
SKIS indicator is located to the right of the tachometer.

VEHICLE THEFT SECURITY - SERVICE INFORMATION

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OPERATION

The Vehicle Theft Security System (VTSS) / Sentry Key Immobilizer System (SKIS) indicator gives an indication to
the vehicle operator of the status of the VTSS/SKIS. This lamp is controlled the instrument cluster circuit board
based upon messages received by the cluster from the Sentry Key REmote Entry Module (SKREEM) over the Con-
troller Area Network (CAN) data bus. The VTSS/SKIS indicator lamp receives battery current on the instrument clus-
ter circuit board through the fused ignition switch output (st-run) circuit whenever the ignition switch is in the On or
Start positions. The lamp only illuminates when it is provided a path to ground by the instrument cluster transistor.
The instrument cluster will turn on the SKIS indicator lamp for the following reasons:

•

Bulb Test - Each time the ignition switch is turned to the On position, the SKREEM tells the cluster to illumi-
nate the lamp for about three seconds.

•

SKIS Lamp-On Message - Each time the cluster receives a SKIS lamp-on message from the SKREEM, the
lamp will be illuminated. The lamp can be flashed on and off, or illuminated solid, as dictated by the message
from the SKREEM. For more information on the SKIS and the SKIS lamp control parameters, (Refer to 8 -
ELECTRICAL/VEHICLE THEFT SECURITY - OPERATION - SENTRY KEY IMMOBILIZER SYSTEM). The
lamp remains illuminated until the cluster receives a lamp-off message from the SKREEM or until the ignition
switch is turned to the Off position, whichever occurs first.

•

Actuator Test - Each time the cluster is put through the actuator test with the scan tool, the lamp will be
turned on for the duration of the test to confirm the functionality of the lamp and the cluster.

The SKREEM performs a self-test each time the ignition switch is turned to the On position to decide whether the
system is in good operating condition. The SKREEM then sends a message to the instrument cluster. If the SKIS
indicator fails to light during the bulb test, refer to the appropriate diagnostic information. If the instrument cluster
turns on the VTSS/SKIS indicator after the bulb test, either solid or flashing, it indicates that a SKIS malfunction has
occurred or that the VTSS/SKIS is inoperative. For proper diagnosis of the SKIS, the CAN data bus, or the message
inputs to the instrument cluster that control the VTSS/SKIS indicator lamp, a scan tool and the appropriate diag-
nostic information are required.

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VEHICLE THEFT SECURITY - SERVICE INFORMATION

WIPERS/WASHERS

TABLE OF CONTENTS

page

WIPERS/WASHERS - ELECTRICAL

DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

FRONT WIPERS/WASHERS - SERVICE

INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 29

REAR WIPERS/WASHERS - SERVICE

INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . 63

WIPERS/WASHERS - ELECTRICAL DIAGNOSTICS