2001 Lincoln LS Logo
Anonymous Posted on Apr 29, 2010

Keypad entry has quit working

My 2001 Lincoln keypad has quit working. This problem seems to stem from a recent reprogramming of the visor mounted garage door transmitter, I don't know if there is a relationship between the two systems. The power door locks continue to work using the remote fob and the lock/unlock buttons inside the door. The factory preset entry code provided with the owners manual will no longer make the system trigger either. if I hit the number 7/8 on the keypad it will trigger the doors to lock, so I suspect the keypad is still functional. Any advise out there?

  • Anonymous May 10, 2010

    Thanks for taking the time to reply.
    I have tried to use the factory default code to operate the keypad and to reprogram the code to my chosen sequence. I cannot get the system to accept either. I do have the original code card that came with the owners manual packet, I have confirmed the code with the printing on the module that is contained within the door cavity, and obviously I have used the code before the program the code I cannot get to work. I am still looking for ideas.
    Thanks

  • tomravalo4 May 11, 2010

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Anonymous

Reinstall your own code,if the preset works and you still have the little instruction card. If not let me know,I'll look at mine and go over the service manuals

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2000 Lincoln Towncar. Keypad on door will not unlock doors. Interior lights do come on. The last two keys pushed simultaneously will occasionally lock the doors. I am using the code printed on a sticker in...

The driver door module (DDM) is connected on the standard corporate protocol (SCP) communication network. The DDM controls many functions including power windows, power door locks and remote keyless entry. The DDM also communicates with the driver seat module (DSM) to control the power mirror and seat memory functions.
Do you know anything about automotive electronic control modules ?
The driver door module (DDM) receives inputs from the digital transmission range (DTR) sensor, ignition switch, seat switch, window/door lock switches, lighting control module (LCM), keyless entry keypad switch and remote transmitter. The DDM outputs consists of keyless entry keypad switch illumination, power door lock actuators, luggage compartment release solenoid, horn relay, and lighting control module (LCM).
Best thing to do would be to have a factory scan tool hooked up to check for DTC'S diagnostic trouble codes . That should be the first step if it's not programming the code.
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  • Keypad.
  • Circuitry.
  • Driver door module (DDM).
  • GO to Pinpoint Test L .

PINPOINT TEST L: THE DOORS DO NOT LOCK/UNLOCK USING THE KEYLESS ENTRY KEYPAD CONDITIONS DETAILS/RESULTS/ACTIONS L1 RETRIEVE THE RECORDED RESULTS FROM BOTH CONTINUOUS AND ON DEMAND SELF TESTS Use the recorded DDM DTCs from the Continuous and On Demand self tests.
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Yes For DTC B1525, GO to L3 .

For all other DDM DTCs, REFER to the DDM Diagnostic Trouble Code (DTC) Index.

No If the door locks are inoperative, GO to L2 .

If the keypad illumination does not operate, GO to L10 .

If the keypad illumination is on continuously, GO to L14 .
L2 CHECK THE DOOR LOCK OPERATION Check the door lock operation by depressing a door lock switch.
  • Do the door locks operate?
Yes GO to L3 .

No GO to Pinpoint Test E . L3 MONITOR THE DDM PID KEY_PAD
Scan tool
Monitor the DDM PID KEY_PAD.
  • Are any of the keyless entry keypad switch numbers present?
Yes GO to L4 .

No GO to L5 . L4 CHECK THE KEYLESS ENTRY KEYPAD SWITCH
Keyless Entry Keypad Switch C525
Monitor the DDM PID KEY_PAD.
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Yes If 1/2, REPAIR Circuit 78 (LB/YE). TEST the system for normal operation.
If 3/4, REPAIR Circuit 79 (LG/RD). TEST the system for normal operation.
If 5/6, REPAIR Circuit 121 (YE/BK). TEST the system for normal operation.
If 7/8, REPAIR Circuit 122 (YE). TEST the system for normal operation.
If 9/0, REPAIR Circuit 123 (RD). TEST the system for normal operation.

No INSTALL a new keyless entry keypad switch; for additional information, REFER to Keypad-Keyless Entry . L5 CHECK THE KEYLESS ENTRY KEYPAD INPUT WITH THE KEYLESS ENTRY KEYPAD SWITCH Monitor the DDM PID KEY_PAD, while depressing all the keyless entry keypad switches one at a time.
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Yes GO to L9 .

No GO to L6 . L6 CHECK CIRCUIT 797 (LG/VT) FOR VOLTAGE
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Measure the voltage between keyless entry keypad C525-7, Circuit 797 (LG/VT), and ground; and between keyless entry keypad C525-8, Circuit 797 (LG/VT), and ground.
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Yes GO to L7 .

No REPAIR Circuit 797 (LG/VT). TEST the system for normal operation. L7 CHECK THE KEYLESS ENTRY KEYPAD SWITCH INPUT While monitoring the DDM PID KEY_PAD, momentarily connect a fused (7.5A) jumper wire between positive battery post and keyless entry keypad switch C525 as follows:
    Keypad Button Keyless Keypad Switch C525 Circuit 1/2 Pin 3 78 (LB/YE) 3/4 Pin 4 79 (LG/RD) 5/6 Pin 5 121 (YE/BK) 7/8 Pin 6 122 (YE) 9/0 Pin 1 123 (RD)

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Yes INSTALL a new keyless entry keypad switch; for additional information, REFER to Keypad-Keyless Entry .

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Measure the resistance between keyless entry keypad switch C525 and DDM as follows:
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No REPAIR the circuit in question. TEST the system for normal operation. L9 CHECK THE KEYLESS ENTRY KEYPAD BACKLIGHT Depress a key on the keyless entry keypad.
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Yes INSTALL a new DDM. For additional information, REFER to Section 419-10 . TEST the system for normal operation.

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No GO to L11 . L11 CHECK DDM GROUND - JUMPER CIRCUIT 66 (LB) TO GROUND
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Connect a fused (7.5A) jumper wire between DDM C522-4, circuit 66 (LB), and ground.
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No REPAIR circuit 797 (LG/VT). TEST the system for normal operation. L13 CHECK CIRCUIT 66 (LB) FOR OPEN Measure the resistance between keyless entry keypad C525-2, Circuit 66 (LB), and DDM C522-4, Circuit 66, (LB).
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Yes INSTALL a new keyless entry keypad switch; for additional information, REFER to Keypad-Keyless Entry .

No REPAIR Circuit 66 (LB). TEST the system for normal operation. L14 CHECK THE KEYPAD ILLUMINATION - DDM DISCONNECTED
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Yes INSTALL a new DDM; for additional information, REFER to Section 419-10 . TEST the system for normal operation.

No GO to L15 . L15 CHECK KEYLESS ENTRY KEYPAD FOR SHORT TO GROUND
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Yes GO to L16 .

No INSTALL a new keyless entry keypad switch. For additional information, REFER to Keypad-Keyless Entry . TEST the system for normal operation. L16 CHECK CIRCUIT 66 (LB) FOR SHORT TO GROUND Measure resistance between DDM C522-4, circuit 66 (LB), and ground.
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Yes System OK. CLARIFY the concern with the customer.

No REPAIR circuit 66 (LB). TEST the system for normal operation.
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