Jeep Grand Cherokee WK. Manual - part 691

U0019–CAN B BUS (CONTINUED)

(D54) CAN B BUS (–) CIRCUIT OPEN

Measure the resistance of the (D54) CAN B Bus (1) circuit between
the Front Control Module C1 connector and the Sentry Key Remote
Entry Module connector.

Is the resistance below 2.0 ohms?

Yes

>> Replace the Sentry Key Remote Entry Module in accor-

dance with the service information.

Perform BODY VERIFICATION TEST - VER 1.

>> Repair the (D54) CAN B Bus (–) circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

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VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS

U0141-LOST COMMUNICATION WITH FRONT CONTROL MODULE

For a complete wiring diagram Refer to Section 8W.

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.

U0146-LOST COMMUNICATION WITH CENTRAL GATEWAY

For a complete wiring diagram Refer to Section 8W.

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) and perform the
U0141-Lost Communication With Front Control Module test for the diagnostic test procedure.

U0155-LOST COMMUNICATION WITH CLUSTER/CCN

For a complete wiring diagram Refer to Section 8W.

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.

VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS

8Q - 81

STANDARD PROCEDURE

SKREEM VERIFICATION

For a complete wiring diagram Refer to Section 8W.

Diagnostic Test

SKREEM VERIFICATION

NOTE: When entering the PIN, care should be taken because the SKREEM will only allow 3 consecutive
attempts to enter the correct PIN. If 3 consecutive incorrect PIN’s are entered the SKREEM will Lock Out the
scan tool. To exit Lock Mode, the ignition key must remain the Run position for I hour. All accessories must
be off. A battery charger connected to the battery during this time period is recommended.

1. Reconnect the previously disconnected components and connectors.

2. Obtain the vehicle’s unique Personal Identification Number (PIN) assigned to it’s original SKREEM. This num-
ber can be obtained from the vehicle invoice or from the DaimlerChrysler Customer Center (Phone 1-800-992-
1997).

3. With the scan tool, select Miscellaneous Functions, WCM/Wireless Control Module. Then select the desired
procedure and follow the display on the scan tool.

4. If the SKREEM was replaced, ensure all the customer’s key have been programmed to the new module.

5. With the scan tool, ease all DTCs. Perform 5 ignition key cycles, leaving the key on for at least 90 seconds
per cycle.

6. With the scan tool, read SKREEM DTC(s).

Are there any SKREEM DTC(s) present?

Yes

>> Repair not complete, refer to the appropriate symptom.

>> Repair is complete.

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VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS

VEHICLE THEFT SECURITY - SERVICE INFORMATION

TABLE OF CONTENTS

page

VEHICLE THEFT SECURITY - SERVICE

INFORMATION
DESCRIPTION

. . . . . . . . . . . . . . . . . . . . . . . . . 83

OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . 84

MODULE-SENTRY KEY REMOTE ENTRY

DESCRIPTION

. . . . . . . . . . . . . . . . . . . . . . . . . 86

OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . 86

STANDARD PROCEDURE

SENTRY KEY IMMOBILIZER SYSTEM

INITIALIZATION . . . . . . . . . . . . . . . . . . . . . . . 87

REMOVAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . 89

TRANSPONDER KEY

DESCRIPTION

. . . . . . . . . . . . . . . . . . . . . . . . . 92

OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . 92

STANDARD PROCEDURE

SENTRY KEY TRANSPONDER

PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . 92

VTSS/SKIS INDICATOR

DESCRIPTION

. . . . . . . . . . . . . . . . . . . . . . . . . 93

OPERATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . 94

VEHICLE THEFT SECURITY - SERVICE INFORMATION

DESCRIPTION

VEHICLE THEFT SECURITY SYSTEM

The Vehicle Theft Security System (VTSS) is designed to provide perimeter protection against unauthorized vehicle
use or tampering by monitoring the vehicle doors, the liftgate, the liftgate flip-up glass, the ignition system and, only
on vehicles built for sale in certain international markets where it is required equipment, the hood. If unauthorized
vehicle use or tampering is detected, the system responds by pulsing the horn and flashing the exterior lamps. In
many markets the VTSS also includes the Sentry Key Immobilizer System (SKIS), which provides passive vehicle
protection by preventing the engine from operating unless a valid electronically encoded key is detected in the igni-
tion lock cylinder.

The VTSS includes the following major components:

•

Door Ajar Switch

•

Driver Cylinder Lock Switch

•

Hood Ajar Switch (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY/HOOD AJAR SWITCH -
DESCRIPTION).

•

Liftgate Ajar Switch

•

Liftgate Flip-Up Glass Ajar Switch

•

Low Beam Headlamp Relay

•

VTSS Indicator (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY/VTSS INDICATOR - DESCRIP-
TION).

Certain functions and features of the VTSS rely upon resources shared with or controlled by other modules in the
vehicle over the Controller Area Network (CCN) data bus network. The other modules that may affect VTSS oper-
ation are:

•

Cab Compartment Node (CCN) (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DESCRIPTION).

•

Driver Memory Mirror Module (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/MEMORY
HEATED SEAT/MIRROR MODULE - DESCRIPTION).

•

Passenger Memory Mirror Module (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/MEM-
ORY HEATED SEAT/MIRROR MODULE - DESCRIPTION).

•

Steering Control Module (SCM) (Refer to 19 - STEERING/COLUMN/STEERING COLUMN CONTROL MOD-
ULE - DESCRIPTION).

VEHICLE THEFT SECURITY - SERVICE INFORMATION

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