GM

GM Repair Problems? Ask GM Repair Expert Now.

Ask an Expert,
Get an Answer ASAP!

GM

98 gmc: with delco radio tape cd player with theftloc on it..unlock

Customer Question
i have 98 gmc 3500...
i have 98 gmc 3500 with delco radio tape cd player with theftloc on it . it is locked and need to unlock . how do i do it ?
Submitted: 7 years ago.Category: GM
Show More
Show Less
Ask Your Own GM Question
Answered in 7 minutes by:
4/5/2010
GM Mechanic: John, GMC Technician replied 7 years ago
John
John, GMC Technician
Category: GM
Satisfied Customers: 9,176
Experience: ASE MASTER TECHNICIAN/40 years experience
Verified

Hello,

This should help you.

 

#PIC4696: Procedure To Unlock Family Radio With Theftlock - keywords audio deterrent display entertainment inoperative loc lock theft deterrent theftloc theft lock - (Nov 28, 2007)

Subject:Procedures to Unlock Family Radio with Theftlock

Models:1994-98 PONT GRAND PRIX, BONNEVILLE AND FIREBIRD
1995-98 SUNFIRE
1996-98 PONTIAC GRAND AM, TRANSPORT
1995-98 OLDS NINETY-EIGHT, EIGHTY-EIGHT, AURORA AND CUTLASS SUPREME
1996-98 OLDS ACHIEVA
1994.5-98 CHEVROLET LUMINA AND MONTE CARLO
1995-98 CHEVROLET CAPRICE
1996-98 CHEV CAVALIER, LUMINA APV,
1995-98 C/K
1996-98 M/VAN AND 96 1/2 G/VAN
1995-98 BUICK REGAL, PARK AVE., ROADMASTER, AND LESABRE
1996-98 SKYLARK, RIVIERA
1996 CADILLAC FLEETWOOD

 


Condition/Concern:

This procedure will correct all RADIO THEFTLOCK concerns for the vehicles listed. Please read the following carefully! There are time limits associated with some of these steps. Therefore, if the directions are not followed properly, unnecessary wait time will occur. The mode the radio theft deterrent system is in will determine which steps to be followed.

Recommendation/Instructions:

The Theft lock logo will appear on the face plate of the radio to indicate this radio has the protection of Theft lock. The Pontiac, Buick, Chevrolet and light trucks will have an indicator light that blinks when the vehicle is off and this feature is activated. Oldsmobile radios do not have the light indicator. The feature is activated by the customer programming a code into the radio. Instructions are in the customer's owners manual. The procedures in this section explains how to operate the theft lock security system. This includes unlocking the radio, removing and entering customer's code, obtaining the radio display code, and changing the customer's code.

The theft lock theft deterrent feature in some models includes an LED indicator light that will blink when the ignition is off and the unit is in the secured state.

Radio display definition:

LOC: Means the radio is locked and there is a customer code stored in the radio.

InOP: Means too many wrong codes have been entered and the radio must be left powered up to 1 hour with battery and ignition applied before 3 more attempts can be made

SEC: Means there is a customer code stored, but the radio is unlocked

---: Means there is no customer code stored and the radio is unlocked

REP: Means the customer code has been entered once, and the radio now wants the code repeated to verify the code was entered correctly the first time.

Index of procedures:

  1. Retrieving scrambled back-up code from unit
  2. Retrieving back-up code from computer (authorized dealers only)
  3. Unlocking/Deactivating unit with back-up code or customer code
  4. Removing customer code
  5. Adding customer code
  6. Changing customer code
  7. InOP second level condition
  1. Retrieving scrambled back-up code from unit - with battery and ignition voltages applied and unit power is on.
    If the unit is in the locked condition (LOC is displayed), proceed to step 2. Otherwise, press and hold presets 1 and 4 for about 4 seconds. The display will show either SEC or ---.
    Press and hold presets 2 and 3 for about 6 seconds until the first 3 digits of the display code are displayed. Write the numbers down.
    Press the AM_FM button and the second 3 digits of scrambled code are displayed. Write the numbers down. The unit will revert to the initial display, prior to code retrieval sequence, after approximately 5 seconds or if another button is pressed.

    Note: If after depressing the AM-FM button the display does not change, your second set of 3 digits will be the same as the first 3 digits. (Example; if 123 came up first, your scrambled code will be 123123.)

     

  2. Retrieving back-up code from computer (authorized dealers only) - scrambled code and authorized lock account number must first be obtained.
    GM dealerships- your authorized lock account number is XXXXX up by the corresponding digit for your controlling car division preceding your 5-digit GM- dealer code. For example, if your GM-dealer code is 01234, and your controlling car division is Chevrolet, then your authorized lock account number would be 101234.
    1- Chevrolet/Geo
    2- Pontiac
    3-Oldsmobile
    4-Buick
    5- GMC
    6-Cadillac
    7- Canada
    8 -Saturn 1991-1998 with Delco radios
    AC-DELCO Shops- Your authorized lock account number is XXXXX up by a 9 & 0 followed by your 6 digit AC-Delco account number. For example, if your AC-Delco account number were 123456, then your authorized lock account number would beNNN-NN-NNNN
    Dial(NNN) NNN-NNNNand listen to the phone prompts. Enter your authorized lock account number followed by an asterisk (*). The next prompt will be your scrambled code that was obtained from step A, followed by an asterisk (*). The computer will respond back with 4 or 6 digit back- up code.
  3. Unlocking/ deactivating unit with back-up code or customer code - with battery and ignition voltages applied and radio power off.
    Press the HR button until the LOC disappears and OOO appears on the display.

    Note: If the display does not change from LOC to 000 the unit is probably in the InOP stage, see Step G.

     

    Set the first two digits (01-19) of the code with HR (hours) button.
    Note: As if you're setting the time of day you will not see the 0 in the far left side. Example; if the first two digits of your code is 02 you will scroll with the HR button until 2 appears on the display.)
    Set the next two digits (00-99) of the code with the MIN (minute) button.
    Press the AM-FM button to enter the code. The radio will now be unlocked and the display will change to the clock. Continue with the following steps to deactivate the theft deterrent.
    Press the HR button until display changes 000.
    Repeat steps 2-4 above to remove previous code and deactivation the theft deterrent system.

    Note: If the backup code received from the computer does not unlock the radio, one possibility is that the first 3 digits of the scrambled code from the radio (Step A) are reversed with second 3 digits. Example; if the scrambled code is 123 456, then it may actually be 456 123. Use Step B retrieve a new backup code.

     

  4. Removing customer code - with battery and ignition voltages applied and radio off.
    Depress presets 1 and 4 for about 6 seconds until the display changes to "SEC". If the display changes to --- there is no code stored.
    Press the HR button until display changes to 000
    Set the first two digits (01-19) of the code with HR button.

    Note: As if you're setting the time of day you will not see the 0 in the far left side. Example; if the first two digits of your code is 02 you will scroll with the HR button until 2 appears on the display.)

     

    Set the next two digits (00-99) of the code with the MIN (minute) button.
    Press the AM-FM button to enter the code. The theft deterrent system will now be deactivated and customer code removed. The display will show --- and then change the clock.
  5. Adding a Customer Code - with battery and ignition voltages applied and radio power off.
    Press and hold presets 1 and 4 for about 6 seconds until the display changes to ---
    Press the HR button until the display changes to 000
    Set the first two digits (01-19) of the code with the HR button.
    Set the next two digits (00-99) of the code with the MIN button
    Press the AM-FM button to enter the code
    When "REP" then 000 is displayed, repeat steps 3 through 5 before display changes back to clock. This confirms the customer code and activates the theft deterrent system. The display will then show SEC for secured.
  6. Changing customer mode
    When changing a code in a unit that has already had one programmed, the original will have to be removed first. If the radio is unlocked follow step D to remove and deactivate the first code.
    Follow step E to reenter a new code.

    Note: If the unit is in LOC the appropriate steps must first be followed

     

  7. INOP second level lock condition

After eight initial failed unlock attempts, the unit will be in a second level lock condition and become inoperative for over 1 hour. Any further code inputs during this hour (or depressing any buttons) will cause the display or indicate InOP for about 15 seconds before returning to LOC.

The unit will still be inoperative. To reset to the normal locked (LOC) condition, battery and ignition voltages must be continuously present for over 1 hour continuously. Do not attempt any radio entries or functions during this time-out period.

After the unit is brought back to the normal locked condition, the correct unlocking procedures can be followed. Following every three unsuccessful entries the unit will return to the inoperative state (InOP) for another 1-hour period.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed

John
John, GMC Technician
Category: GM
Satisfied Customers: 9,176
Experience: ASE MASTER TECHNICIAN/40 years experience
Verified
John and 87 other GM Specialists are ready to help you
Ask your own question now
Ask John Your Own Question
John
John
John, GMC Technician
Category: GM
Satisfied Customers: 9,176
9,176 Satisfied Customers
Experience: ASE MASTER TECHNICIAN/40 years experience

John is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

GMC Mechanic

5,792 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

GMC Technician

1,523 satisfied customers

15 years gm master tech/15 years ASE master tech

car tech

car tech

ASE Certified Technician

449 satisfied customers

25 year master tech and shop owner

Chris (aka- Moose)

Chris (aka- Moose)

GMC Technician

203 satisfied customers

16 years of experience

Paul M ASE Master

Paul M ASE Master

ASE Master Tech

187 satisfied customers

ASE Master Tech 20+ Years

Anthony

Anthony

GMC Technician

489 satisfied customers

GM Certified

Amedee

Amedee

GMC Technician

451 satisfied customers

ASE certified tech with advanced level specialist. Wisconsin certified emissions state inspector

< Previous | Next >

Related GM Questions
I just got a 2003 H2 at an auction and wont shift gears
I just got a 2003 H2 at an auction and wont shift gears after 40mph and service 4wd light is on, vehicle has 129k miles, what should I check for? … read more
Chris (aka- Moose)
Chris (aka- Moose)
GMC Technician
Vocational, Technical or Trade School
203 satisfied customers
Low beams will not come on. 2007 GMC Envoy. Checked lamps,
yes - checked lamps, fuses. Both OK. High beams will only come on in manual, not with flicker. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Where is the day time running light module? Well my low beam
Well my low beam and running lights aren't working and there's no power at the fuse. It's an 04 envoy … read more
Mechanic01
Mechanic01
1,151 satisfied customers
Will the 20” rims of my previous owned 2011 Yukon Denali fit
Will the 20” rims of my previous owned 2011 Yukon Denali fit my 2015 Sierra Denali 1500 series… read more
Expert
Expert
13 satisfied customers
I have a 2007 Hummer H2 w a swing out spare tire mount. I
I have a 2007 Hummer H2 w a swing out spare tire mount. I would like to remove it. 1) is the removal of the swing arm simply an un-bolt or will I have to buy replacement parts. 2) I want to replace th… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
97 1500 5.7 Installed new fuel pump, Have 55psi at the rail,
97 1500 5.7 Installed new fuel pump, Have 55psi at the rail, only runs on either. What could have happened?… read more
Edward Clayton
Edward Clayton
Associate Degree
1,033 satisfied customers
Left rear cab is filling with water seem like the drain tube
left rear cab is filling with water seem like the drain tube is to short. shouild the drain tube exit through the in bottom of cab corner? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
We have a 1997 GMC Sierra 4x4 we bought new and has 150,000
We have a 1997 GMC Sierra 4x4 we bought new and has 150,000 on it. The transmission torque converter was rebuilt at 49,600 miles. The problem is that when we put a stop Is that when we put a strain on… read more
Gary
Gary
GMC Technician
Vocational, Technical or Trade Scho
1,523 satisfied customers
Having trouble with chevy cobalt 2006, coolant temp on gage
having trouble with chevy cobalt 2006, coolant temp on gage in car reads 252F when I disconnect the coolant sensor the temperature drops to 232F, checked sensor with meter and tests ok, cooling fan ru… read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,888 satisfied customers
I have a 2007 Chevy Tahoe. I set the parking brake and I
I have a 2007 Chevy Tahoe. I set the parking brake and I can't get it to release back up. The Tahoe won't move.… read more
Chris (aka- Moose)
Chris (aka- Moose)
GMC Technician
Vocational, Technical or Trade School
203 satisfied customers
04 Yukon AC is cooling and suddenly starts blowing hot air,
04 Yukon AC is cooling and suddenly starts blowing hot air, I shut off engine and AC works OK.… read more
Aran
Aran
Technician
Associate Degree
392 satisfied customers
Need to check community on a 2011 gmc 1500 5.3 6 speed tcm
Need to check community on a 2011 gmc 1500 5.3 6 speed tcm what pins z would it be … read more
Chris (aka- Moose)
Chris (aka- Moose)
GMC Technician
Vocational, Technical or Trade School
203 satisfied customers
How do I find the engine size for my 2007 Hummer H3? I am
How do I find the engine size for my 2007 Hummer H3 ? … read more
Chris (aka- Moose)
Chris (aka- Moose)
GMC Technician
Vocational, Technical or Trade School
203 satisfied customers
I have a 2015 Cadillac Escalade and it just went over 50,000
Hello I have a 2015 Cadillac Escalade and it just went over 50,000 miles and I think I hear a squeaking noise in the rear shocks that's pretty faint when I go over large bumps slowly. Since the warran… read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,888 satisfied customers
Need some info for oil pan gasket for my chevy 99 express.
need some info for oil pan gasket for my chevy 99 express … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
What is the torque specs for the oil pan bolts? for the 4 in
What is the torque specs for the oil pan bolts? for the 4 in the corners and the rest small ones.… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
I have an ‘09 Acadia. It just started a few days ago kind of
I have an ‘09 Acadia. It just started a few days ago kind of bucking at about 65-70 mph. It sat for about a week with no prior issues. When I started it back up, this began happening … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Change oil After 3000 miles there is NO oil left. 2 times
Change oil After 3000 miles there is NO oil left. 2 times now. And no indication that oil is low other than the oil pressure dropping down to about 21- usually around 60 on cold start and 42 or so whe… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x