Key pad lights up but doesn't work

[smokin joe]

As the title says the key pad on the door lights up but when I type in the code it doesn't work, and it doesn't work when you hold the last two to lock it, Since the buttons were cracked I thought it might be getting moisture in it so I switched it out with a good known working one, (what a pain in the a$$) and it still doesn't work I did search and didn't find anything besides test the wires, anyone have any luck with this problem? :thankyou: Oh and this is on a 95MTX with keyless entry btw

 

[Storm-Chaser]

The keypad backlighting and functioning of the keypad are both controlled by the Keyless Entry Module, but work off of different harness circuits.

First, which functions of the keyless entry are working? Is the key-fob working?

 

[randy'sho]

same thing on my 95 the lights on the keypad come on, but the buttons do nothing!

 

[Storm-Chaser]

Guys, that's not enough information.

The keypad does not work at all ? What functions are working, versus not working ? (unlock driver's door, unlock all doors, unlock trunk, lock all doors)

Ares these functions working using the key-fob, or not working ?

Do the door unlock/lock functions work using the internal door lock switches ? Which ones ? (driver's side only, passenger side, both)

 

[randy'sho]

just like i said none of the buttons are working on the keypad! the interior lock/unlock works great and even the keyless remote fob works, but nothing on the keypad except the lights come on when you press a button! thanks for your help!

 

[ultimatesho]

same thin my 95 MTX did.......pulled the keyless module from the trunk and one of the circuit boards literally melted in a little spot

all my lights would work but the keypad on the door wouldnt work at all........interior locks worked fine to

 

[stangeater]

same thin my 95 MTX did.......pulled the keyless module from the trunk and one of the circuit boards literally melted in a little spot

all my lights would work but the keypad on the door wouldnt work at all........interior locks worked fine to

Okay, so how did you fix this....or did you?

 

[smokin joe]

just like i said none of the buttons are working on the keypad! the interior lock/unlock works great and even the keyless remote fob works, but nothing on the keypad except the lights come on when you press a button! thanks for your help!

Yup thats what I have going on, just put a new keyless entry modual in(key pad wasnt working before new one or after), all the door locks inside work key fob works, just the key pad doesnt work like i said you can press the buttons and it lights up it just wont lock unlock or anything when you type the code in

 

[ultimatesho]

Okay, so how did you fix this....or did you?

havnt yet (95's still sittin) all u need to do tho is get a new keyless module .......that is if thats ur problem......sounds like it to me tho

easy enuf to pull the module and check out the boards just to check tho

 

[revhardSHO]

I have this identical problem with my 90. The keypad lights up, but the buttons do nothing. Interior door/window controls work perfectly. I've changed the keypad module in the trunk three (3) times. No fix. What else could it be? Bad keypad?

 

[smokin joe]

havnt yet (95's still sittin) all u need to do tho is get a new keyless module .......that is if thats ur problem......sounds like it to me tho

easy enuf to pull the module and check out the boards just to check tho

Its not in the keyless modual I have had three different ones in the car and it doesnt work its something else

 

[SeanPN]

Its controlled by the high power fuse's in the engine bay, did you check those out?

 

[Storm-Chaser]

Okay - so *none* of the functions work via the keypad, including the lock-all-doors feature?

There are three ways to lock/unlock the doors - the keypad, the two front door lock buttons, or the keyfob. The door lock buttons work and keyfob completely work. The five-digit code does not work, but does the "79" code work?

Yup thats what I have going on, just put a new keyless entry modual in(key pad wasnt working before new one or after), all the door locks inside work key fob works, just the key pad doesnt work like i said you can press the buttons and it lights up it just wont lock unlock or anything when you type the code in

 

[smokin joe]

Ok so the key fob works and the door locks on the inside work, you press the buttons on the key pad on the door, it lights up but it doesnt unlock it, or lock using the 79 code, the only thing i can get it to do is light up, everything else works just fine

 

[Storm-Chaser]

I [currently] don't have access to my EVTM, but if I remember correctly, the keypad buttons use one common ground circuit and individual circuits for power from the Keyless Entry module.

If the "79" lock all doors function works, and the keyless entry code only contains 7s and 9s in the five-digit code but the keyless code does not work - then the Keyless Entry module has failed.

If the "79" lock all doors function works, but the keyless code contains a 1, 3, or 5 in the five-digit code - then it's possible that at least one of those buttons or button circuits has failed, or the module is at fault.

If the "79" lock all doors function does *not* work, and the keyless code contains a 7, or 9 in the five-digit code - it's possible that one of those buttons (or the circuit) has failed.


If you have already tried a second *known working* module and it does not correct the situation, the problem is likely tied to the keypad or one of the keypad button's circuits. While the keypad is not the easiest thing to change, you can try a known working keypad to test the harness circuits to the module.

The harness wire-leads from the keypad are routed along the aft section of the door, with an 8-wire harness connector to the driver's door harness near the door handle. Remove the door panel, locate the connector and plug-in the known working keypad (be careful, as the two small locking tabs break-off quite easily). If the keypad works, the keypad was at fault; if it does not, you have either an open circuit-fault or failed module.

 

[smokin joe]

so i have an open circuit because the module is good

 

[Lupo]

I had something similar happen to my car.
1.The keyless module was not working (the FOB would not "register") and the keypad did not work either.
2. I put in a working keyless module I salvaged from another car. FOB then registered, and the keypad started working.
3. Keypad stopped working. FOB still worked.
4. Put back in the old keyless module, and the FOB worked, and the keypad worked as well.
5. Keypad stopped working, but the FOB still works with my original keyless module.

Basically seems like whenever I disconnect and reconnect the keyless module, the keypad starts working for a little while, then stops (either module). FOB always seems to work now. Not sure why it didn't work when i got the car.

 

[Storm-Chaser]

If you've replaced both the keypad and module with known working replacements, then yes.

so i have an open circuit because the module is good

 

[smokin joe]

If you've replaced both the keypad and module with known working replacements, then yes.

Well that is what i said :wave:
:thankyou: for the help,

 

[stangeater]

Seems like 2 things here...............
1: a lot of 95's have this problem
2: There is nobody who has successfully fixed this problem.