Diagnose keyless entry system of 1997 Cherokee

The RKE is controlled by the SJB - smart junction box ! Fords BCM - body control module .
Principles of Operation
Power Locks
The SJB controls the power lock/unlock feature of all of the vehicle doors, including the liftgate, to lock or unlock based on the input received from the door lock control switch, the keyless entry keypad or the remote keyless entry (RKE) transmitter. Power locking and unlocking of the doors function independently of the key position, vehicle speed or transmission position. The smart junction box (SJB) activates internal relays to supply the correct voltage and grounds for the door lock actuators.

Your best bet would be to take to ford dealer or some other qualified repair shop .
Remote Keyless Entry (RKE) Transmitter Lock/Unlock Control - Unlock
The RKE transmitter feature provides lock/unlock functions independently of key position, vehicle speed, or transmission position. The RKE transmitter feature provides a 2-step process for unlocking the doors. Upon receipt of the first request for unlocking the doors, the RKE control feature requests the SJB to unlock the driver door only. If another unlock request is received within 3 seconds of the first, the RKE transmitter feature requests the SJB to unlock all the doors. This feature can be changed to global unlock, so that all the doors unlock on the first press of the unlock button. To toggle between the 2-step unlock and the global unlock press the lock and the unlock button on the RKE transmitter at the same time and hold the buttons for 4 seconds. The turn signal lamps flash to confirm that the feature has been toggled.
Remote Keyless Entry (RKE) Transmitter Lock/Unlock Control - Lock
The RKE transmitter feature requests that all the doors be locked when the lock button is pressed. On any press of the lock button with all doors closed, the SJB provides 1 flash of the parking lamps. If any door is ajar, no flash occurs. As soon as the last door is closed, the SJB provides the flash of the parking lamps. If 2 presses of the lock button are received within 3 seconds, the horn chirps once, and the parking lamps flash twice to indicate that all the doors are closed and locked. If any door is ajar when the second lock request is received within 3 seconds of the first, the RKE transmitter feature requests the SJB chirp the horn twice without flashing the parking lamps to indicate it locked all the doors but 1 or more doors are ajar. When the key is in the ON or START position, the parking lamp flashes and horn chirp confirmations do not occur.

All locks not working ?????

• The doors do not lock/unlock using the remote keyless entry (RKE) transmitter

• RKE transmitter battery
• RKE transmitter
• RKE transmitter programming
• Aftermarket system
• SJB

• Go To Pinpoint Test H .

The vehicle horns are activated under the following conditions:
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The horn switch is depressed.

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The body control module (BCM) commands the horns on. The BCM commands the horns on under either of the following conditions:

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When the content theft deterrent system detects a vehicle intrusion. For further information, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.

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When the panic button is depressed on the remote control door lock transmitter. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.

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When the OnStar?® system is used to sound the horns, if equipped. For further information, refer to OnStar Description and Operation in Cellular Communications.

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When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry

System Description
The horn system consists of the following components:
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HORN fuse

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Horn relay

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Horn slip ring

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Horn switch

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Horn assembly

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Body Control Module (BCM)

System Operation
The vehicle horn system is activated under the following conditions:
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The horn switch is depressed.

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The body control module (BCM) commands the horns on. The BCM commands the horns on under any of the following conditions:

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When the panic button is depressed on the remote control door lock transmitter. For further information refer to Keyless Entry System Description and Operation .

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When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information refer to Keyless Entry System Description and Operation .

Besides the switch on the steering wheel being pushed to control the horns , the BCM - body control module can activate the horns as well .
The horn system consists of the following components:
• HORN fuse
• Horn relay
• Horn slip ring
• Horn switch
• Horn assembly
• Body Control Module (BCM)
System Operation
The vehicle horn system is activated under the following conditions:
• The horn switch is depressed.
• The body control module (BCM) commands the horns on. The BCM commands the horns on under any of the following conditions:
- When the panic button is depressed on the remote control door lock transmitter. For further information refer to Keyless Entry System Description and Operation .
- When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information refer to Keyless Entry System Description and Operation .
Circuit Operation
Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing the horn switch applies ground to the horn relay control circuit. The body control module (BCM) may also apply ground to the horn relay control circuit as described above. When the horn relay control circuit is grounded, the horn relay is energized and battery positive voltage is applied to the horns through the horn control circuit. The horns sound as long as ground is applied to the horn relay control circuit

The BCM is receiving an erroneous signal from somewhere , keyless entry maybe. Hooking up a professional type scan tool to view inputs to the BCM would be the first diagnostic step I would do at the dealer .

Horn will sound only after keyless entry system has checked all doors and sensors are in locked condition,
including all doors, hood , truck and other locks. I have copied the sensor locations for you and circuit diagram
for keyless/burglar system. Hope this will help.
Component Location



I’m happy to assist further over the phone at https://www.6ya.com/expert/uttamjeet_2f3adc18600f8ede

I have never had to do this but I am told this is the correct proceedure.

Keyless entry key pad procedure
1. Turn the ignition to the 1 (OFF/LOCK) position.
2. Close all the doors.
3. Enter 5-digit entry code
4. Press and hold the 7 • 8. While holding the 7 • 8 press the 3 • 4.
5. Release the 3 • 4.
6. Release the 7 • 8.
The user should receive a horn chirp to indicate the system has been
disabled or a chirp followed by a honk to indicate the system has been
enabled.

The VTSS (Vehicle Theft Security System) might be armed. To dissarm insert and rotate the key on the driver door lock or the passenger door lock or the liftgate door lock. You can also disarm it by pushing the button on the keyless control unit.

If you have your owner's manual, there is a section that will tell you the exact sequence to press to enable/disable the horn bonk. It has three settings, chirp, honk, and off. The chirp is a really quick chirp of the horn. Honk is a longer honk. Off seems to be what you've set.

I hope this helps.

stand at the vehicle and push and hold the lock and unlock buttons till the horn chirps to resync the key fob

SECTION 501-14B: Keyless Entry/Computer Operated Locks 1999 Town Car Workshop Manual GENERAL PROCEDURES Programming —Keyless Entry Keypad Code

1. Enter the permanent factory keyless entry keypad code.

1. Press the 1/2 button within five seconds to activate the programming mode. Holding the 1/2 button for more than two seconds will erase all stored customer codes. The existing codes do not need to be erased to program new codes.

1. Enter the new five-digit keyless entry keypad code.

1. To associate the new code with personality positions 1, 2 or 3, press the 1/2 button within 5 seconds of entering the 5th digit of the new code for position 1 or 3/4 button for position 2 or 5/6 for position 3. The door locks will lock and unlock confirming the new code is programmed.

1. If another code is to be programmed, begin entering the code within 5 seconds of the last button pressed.

1. After all new keyless entry codes are programmed:
   • Press keyless entry keypad buttons 7/8 and 9/0 at the same time to exit the program mode.
   • Wait for 5 seconds; the driver door module (DDM) will exit the program mode automatically.
   • -------------------------------------------------------------

Programming —Transmitter

1. Cycle the ignition from OFF to RUN four times within three seconds. The locks will then lock and unlock, confirming program mode has been entered.

1. NOTE: When the first keyless entry remote transmitter is programmed, all other keyless entry remote transmitters are erased.
   Press any button on the transmitter to be programmed.

1. If additional keyless entry remote transmitters are to be programmed, repeat step 2 within 7.5 seconds.

1. To exit program mode, turn the ignition to START or wait 7.5 seconds.

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Programming —Remote Memory Activation NOTE: This procedure must be completed within 5 seconds.

1. Press the SET button on the driver door panel.

1. Press any button on the keyless entry remote transmitter to be associated with a memory setting.

1. Press the 1 or 2 memory button on the driver door panel.

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Programming —Autolock and Horn Chirp

1. NOTE: This procedure must be completed within 30 seconds.
   Turn the ignition switch to RUN.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to OFF.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to RUN. The doors will lock and unlock to confirm entry into program mode.

1. Press the UNLOCK button once to toggle the Autolock feature on or off, or twice to toggle the Horn Chirp function on or off. The horn will chirp to confirm toggling of the Autolock feature.

1. Exit program mode by turning the ignition to OFF, START, or wait 7.5 seconds.

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