2004 Tahoe Security Glitch

[ojb226]

Hey folks. 2004 Tahoe Z71 with 320K on the clock.

THE FOB IS NOT THE PROBLEM... I've tried multiple new OEM fobs..

on the driver door, the lock button does not work. the unlock button does.
on the passenger door, the lock button does work. the unlock button does not.

on the fob, the lock button works, but the unlock button does.

any ideas on the issue? I've looked into a VIPER alarm system but a technician recommended not doing it unless i solve the core issue first. Do you think if i do a ECU/PCM swap that would fix it?

Thanks in advance.

 

[Miami-Dade]

@ojb226 Moved you here from 2021 section.
Welcome from NYC!

 

[Doubeleive]

Hey folks. 2004 Tahoe Z71 with 320K on the clock.

THE FOB IS NOT THE PROBLEM... I've tried multiple new OEM fobs..

on the driver door, the lock button does not work. the unlock button does.
on the passenger door, the lock button does work. the unlock button does not.

on the fob, the lock button works, but the unlock button does.

any ideas on the issue? I've looked into a VIPER alarm system but a technician recommended not doing it unless i solve the core issue first. Do you think if i do a ECU/PCM swap that would fix it?

Thanks in advance.

sounds like time to try some door switches, the junkyard is your friend.
I would try the master switch first and see if that allows the passenger side to work properly
the switches are tied into the master, so if the master is bad the others "may" not work correctly.
pretty unlikely to be anything else unless of course the actuator is bad, "maybe" a relay. but less likely.

 

[ojb226]

Thank you!
Those master switch modules are pretty pricey on eBay and they’ve all been ripped out in my local yard.
I will keep looking!

 

[Joseph Garcia]

There is a nationwide salvage yard parts network that can find and ship parts to you, if they are not available locally. Did you ask your local salvage yard about it?

 

[Tonyrodz]

Thank you!
Those master switch modules are pretty pricey on eBay and they’ve all been ripped out in my local yard.
I will keep looking!

Try taking the switch apart. Doesn't cost anything to try. The contacts might have gotten corroded. You might luck out if you clean the up.

 

[Doubeleive]

Thank you!
Those master switch modules are pretty pricey on eBay and they’ve all been ripped out in my local yard.
I will keep looking!

what search parameters are you using on ebay? the switch should be the same for the most part for 03-06 across the board including silverado/sierra/avalanche
non power/power fold mirror switch I believe is the only difference (but i could be wrong)
also trim color doesn't matter because the switch just clips on
so you could find it under
03
2003
04
2004
05
2005
06
2006
tahoe, yukon, suburban. silverado, sierra, avalanche
unsure on the escalade switch being compatible or not

 

[ojb226]

@ojb226 Moved you here from 2021 section.
Welcome from NYC!

thank you!

 

[ojb226]

what search parameters are you using on ebay? the switch should be the same for the most part for 03-06 across the board including silverado/sierra/avalanche
non power/power fold mirror switch I believe is the only difference (but i could be wrong)
also trim color doesn't matter because the switch just clips on
so you could find it under
03
2003
04
2004
05
2005
06
2006
tahoe, yukon, suburban. silverado, sierra, avalanche
unsure on the escalade switch being compatible or not

thanks Doubeleive!
Just ordered one off ebay for $60. For some reason the last time i looked I only found OEM remans that were north of $200!
I will let you all know if that was the problem after I get it installed next week.

 

[ojb226]

UPDATE!

The new master switch looks great, no more faded black.
It solved the unlock/lock issue within the car, but the FOB still only works on the lock button. the unlock button does nothing.
I will give it another try with buying a new FOB (i only have one) but I'm not optimistic.
Any suggestions with diving deeper into the ECU or harness?
I do have HP Tuners by the way.

 

[dps01]

the FOB still only works on the lock button. the unlock button does nothing.

If you have not tried cleaning the fob yet, try cleaning with DeoxIT D5. It’s pricey for a small can, but works wonders on old switches / contact's.

 

[Doubeleive]

UPDATE!

The new master switch looks great, no more faded black.
It solved the unlock/lock issue within the car, but the FOB still only works on the lock button. the unlock button does nothing.
I will give it another try with buying a new FOB (i only have one) but I'm not optimistic.
Any suggestions with diving deeper into the ECU or harness?
I do have HP Tuners by the way.

fob issue's are usually just the fob, you can try opening the fob up and clean the pcb board with rubbing alcohol dabbed on a soft cloth (rub the cloth on the button contacts) and then put it back together and see if it works better or not.
the fob is pretty basic, upper and bottom plastic piece, board, battery, rubber pad

 

[ojb226]

If you have not tried cleaning the fob yet, try cleaning with DeoxIT D5. It’s pricey for a small can, but works wonders on old switches / contact's.

Yikes, thats more than a pair of keys and fobs on amazon lol.
If I didn't need to get another spare key and a 2nd fob, i'd do that. Hopefully the new set from amazon will work great.
I will keep you folks posted.

 

[dps01]

thats more than a pair of keys and fobs on amazon lol.

Understood.
A cleaned up OEM fob may be better in the long haul, but your point is well taken .

 

[Fless]

CRC Electronics Cleaner would be a good (read: less expensive) alternative. But isopropyl alcohol would do the job, just don't leave any Q-tip cotton on the contacts.