tahoe2007

I started having these kind of problems on a monthly basiswhenmy GM lockpic was installed in my Tahoe. My blinkers worked but had no sound, (Not everytime, and usuallyI could turnTahoe off and back on and it would fix it for a while)then it was my nav would sometimes just power off, then I had all sorts of other electrical issues -"Lights on the dash warnings about his and that". I finally had to just get the darn thing out- andI have been free of problems since then (Its been about 4 months since I had it removed) If you have a lockpic (or whatever its called) you may find it is related.I know some people say they dont experience these issues with it, but I had mine installed for 9 months and for the first months it worked fine, but from then on is when I experienced electrical failures, and radio issues from then on, until was removed.

davemec

I've had this issue before with the turn signals and nav not working. I don't have and never have had the lockpick installed so the problems have to be with the nav unit itself. I am unable to reproduce the problem so of course the service department says they can't do anything about it. I have read that the nav unit has been upgraded, but as far as I know GM isn't doing anything about the early models of the nav unit.

bobK

Electrical Problems: My 2000 Tahoe has been doing this and I do not subscribe to On Star. The radio turns off. The time resets to 1:00. Sometimes the radio works fine and other times it shuts of every few seconds. The main door lock locks all of the doors, but the driver side. Have to slide it manually or use the remote to lock the drivers door. Now the power heated seat is on and won't turn off. The heat indicater light is not on, but the seat is on high and gets very warm. It seems to be on with the truck turned off and the key is removed. We have replaced the battery 3 times since this all started. Dealer has no clue what it is. Been fighting it for almost 2 years now. Have checked every fuse and every relay. In the beginning we thought the rear wiper was dragging down the battery so we I unhooked it and things we fine for about a year. Now every day something else starts acting whacky.
Pulled the fuse to get heated seat off.

73shark

Welcome to the forum.

Stab in the dark ==> bad ground(s).

QUETRANPA

you know I just had this stupid problem with my navigation unit, my wife was in the car listening to the radio with the engine off for who knows how long, when I got in the truck and tried to start it the battery was dead, when I jump started the truck the turn signal sound was gone and the navi screen was only showing "DELPHI" like it always does at the beginning but this was permanent, so I press the power button and the radio turned off, so ok press power again and it will power on, but nothing!!! after a few minutes the sound for the turn signals came back but the radio only makes a static noise when i try to turn it on but nothing, any one found a solution yet? I will keep on searching and see if I find what the problem is.
my head unit didn't come with the truck, I installed ti myself, but everything was working fine, I even had my battery run down a couple of times before but no problems whatsoever!!
The back up camera still works fine, I can see the image in the navi unit when the truck is in reverse!! the battery is about 3+ years old, is the one that came with the truck so I will check it and check all the fuses and see if I can find something

73shark

Might check to see if the battery rundown software upgrade was ever performed.

My '07 on two separate occasions didn't have any sounds but they came back the next day. Everything worked tho, just no sounds.

QUETRANPA

Thank you shark
So that battery rundown software upgrade is a recall or something?
'cause as far as I know that has not been performed on my truck yet, since I bought it brand new, I guess I will call the dealer and find out about it
You know this morning I tried to turn the radio on and same thing, it only worked for like 2 seconds, but this time I changed the station before it turned off and I was able to hear the music from some radio station, but the screen remained black and I can only see the clock, I'm wondering if there is a fuse inside the radio or something, I will mess with it till this weekend, I'm kind of busy right now.

73shark

The battery rundown software update was usually just done when you took it in for something else or if you complained about the battery running down.

in2pro

Try plugging your VIN into here, I believe this is a history of software updates that your vehicle has had (thou I am not totally sure) It looks to be updates done not just available....

http://tis2web.service.gm.com/tis2web

in2pro

This is what mine looks like...

GM Vehicle Calibration Information



VIN: 1GNFC13077XXXXXXX
Controller: BCM Body Control Module



Calibration History for: Operating system
Part Number CVN Bulletin # Description
15943677 0000CC75 - New software for improved operation.
15924898 0000E48F - New software for improved operation including a fix for phantom wipe when rain sensing is enabled.
15901392 000007DA - New software to correct PLGM inop. issue
15878754 000011BC - New software to improve operation of exterior lighting.
15856824 000017BE - Operating system

Calibration History for: System
Part Number CVN Bulletin # Description
25868159 00009C22 - Corrects potential issue with inadvertent cancel of remote start requests.
25779899 00003CEC - New calibrations for improved operation.
15920041 00008F08 - New calibrations for improved operation.
15892286 0000D1EA - New calibrations for improved operation of dealer-installed accessories.
15849418 00003804 - System

Calibration History for: Charging/Energy Storage
Part Number CVN Bulletin # Description
25855125 000002F8 - New calibration to ensure proper charging system operation.
25779912 00001D8D - New calibrations for improved operation.
15920043 0000A008 - New calibrations for improved operation.
15880638 00009418 - New calibrations to disable generator load-shedding.
15842576 000070A0 - Charging/Energy Storage

Calibration History for: Interior/Exterior lighting
Part Number CVN Bulletin # Description
15943647 0000084F - New calibrations for improved operation.
15929700 0000547A - New software for improved operation including a fix for phantom wipe when rain sensing is enabled.
15906684 0000D330 - New software to correct PLGM inop. issue
15886175 0000D0DD - New calibrations to allow BCM to go to sleep if the Inadvertent Power Circuit experiences either a short-to-ground or blown fuse.
15859828 000003F8 - Operating System
15842553 0000BED4 - Interior/Exterior lighting

Calibration History for: Wiper Control
Part Number CVN Bulletin # Description
25779885 0000E398 - New calibrations for improved operation.
15842539 00007966 - Wiper Control
M4455: There are 2 calibration part numbers that are valid for 'Locking'. Read the descriptions from the following tables to determine the correct calibration for this vehicle.
Calibration History for: Locking
Part Number CVN Bulletin # Description
25779910 000075DC - Auto door lock option in DIC for at-speed or out-of-park-gear only. (Cannot disable auto door locking)
15930971 0000BD2B - New calibrations for improved operation.
15842536 000074A6 - Locking

Part Number CVN Bulletin # Description
25822970 0000746A - (Per Customer Request Only) Auto door locking off; Option no longer in DIC.
15930971 0000BD2B - New calibrations for improved operation.
15842536 000074A6 - Locking

Calibration History for: Theft deterrent alarm
Part Number CVN Bulletin # Description
25779891 00003461 - New calibrations for improved operation.
15901381 00008E41 - New software to correct PLGM inop. issue
15859829 0000E91E - Operating System
15842533 0000136F - Theft deterrent alarm

Calibration History for: HVAC Control
Part Number CVN Bulletin # Description
25779883 000063CE - New calibrations for improved operation.
15930972 0000DD4D - New calibrations for improved operation.
15842530 0000FD3B - HVAC Control

Calibration History for: Powertrain Control
Part Number CVN Bulletin # Description
25779889 0000E42F - New calibrations for improved operation.
15886131 00006ECD - New calibrations of transmission interlocks to disallow shifting while vehicle is in Accessory mode.
15859807 000008DC - Operating System
15842532 0000192A - Powertrain Control

Calibration History for: Chassis Control
Part Number CVN Bulletin # Description
25779925 00008A7B - New calibrations for improved operation.
15892289 000019B5 - New calibrations for improved operation of dealer-installed accessories.
15842528 0000E9AD - Chassis Control

Calibration History for: Driveline
Part Number CVN Bulletin # Description
25779927 0000A500 - New calibrations for improved operation.
15891821 0000F8F1 - Driveline