Tip & How-To about Car Audio & Video

Radio Codes

First, explanation of radio codes. - It's a theft deterrent built into your radio from the factory. Every factory has a different sequence or order that code must be entered. When vehicle is sold new there is usually a card(s) separate from the owners manual for security.(Most times former owner still has it in his wallet and not in glovebox) The only way you can get your radio code is by contacting dealer and provide them the VIN# of your vehicle. Some even require you to come in physically w/proof of ownership. Each code is specific to VIN and make and there literally thousands of combinations. Once your radio loses power or your battery is disconnected it's almost a given that you'll need the code to get radio back up & running.
TIP: If you have your code, or once you get it from the dealer - take 30 secs and write it down in glovebox or someplace safe in vehicle w/a Sharpie, then you won't have to hassle chasing it down when your battery goes dead or you're doing maintenance.

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How am i supposed to get ride off the Service theft system?

It's hard to fix something if you don't know how it works ! Fixed ignition ? What did you fix or change ?
Security: Refer to Theft Systems Description and Operation in Theft Deterrent
You need to have it checked for trouble codes .
The theft deterrent system on this vehicle is comprised of two separate systems, the vehicle theft deterrent (VTD) system and the content theft deterrent (CTD) system. The VTD system prevents drive away theft by keeping the vehicle from starting. The CTD system is the vehicle alarm system which discourages unauthorized entry into the vehicle. These systems are described and diagnosed separately within this section.
Theft System Indicators
SECURITY The instrument panel cluster (IPC) illuminates the SECURITY indicator as determined by the vehicle theft deterrent (VTD) system and the content theft deterrent (CTD) system. The IPC receives a message from the theft deterrent control module or the rear integration module (RIM) via the serial data circuit requesting illumination.
The VTD system requests the IPC to illuminate the indicator only when the ignition switch is ON. The VTD system uses the indicator as a malfunction indicator. For specific VTD condition that will illuminate the security indicator, refer to
Vehicle Theft Deterrent (VTD) Description and Operation .

The CTD system requests the IPC to illuminate the indicator only when the ignition switch is OFF. The CTD system uses the indicator in order to identify system status. For specific CTD condition that will illuminate the security indicator, refer to Content Theft Deterrent (CTD) Description and Operation .

The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
SERVICE THEFT SYSTEM The radio illuminates the SERVICE THEFT SYSTEM message when the VTD system detects a failure. The radio receives a message from the theft deterrent control module via the serial data circuit requesting illumination.
This is one you need to take to the dealer , unless you have a GM factory scan tool !

Nov 21, 2015 | 2004 Cadillac CTS

1 Answer

replaced ignition switch vehicle will not start appears to be computer code

Is there a computer related code which I must enter via the radio ??? You don't enter anything through the radio !!!!! Having factory service repair info so you can read how the anti-theft system works an a scan tool to pull DTC'S - diagnostic trouble codes is the proper way to diagnose .
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock™ sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM)/vehicle control module (VCM). The message enables the fuel injectors.
The design of the Passlock™ system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the PASS-Key® system. However, the Passlock™ system eliminates the need for a key mounted resistor pellet. The components of the Passlock™ system are as follows:
• The ignition lock cylinder
• The ignition switch
• The Passlock™ sensor
• The Body control module (BCM)
• The security telltale
• The vehicle/powertrain control module (VCM/PCM)

Your best bet , take it to a qualified repair shop.

Mar 06, 2018 | 2002 Chevrolet Avalanche

2 Answers

anti thief device

Check the help links mentioned below :---Relearn Theft deterrent module? http://technoanswers.blogspot.com/2012/01/relearn-theft-deterrent-module.html
---------theft deterrent module Relearning? http://howtobyme.blogspot.com/2012/01/buick-theft-deterrent-module-relearning.html
--------Engine will not crank after relearning Theft deterrent module? http://howtobyme.blogspot.com/2012/01/engine-will-not-crank-after-relearning.html
--------Can car radio code block Passkey anti theft system ?

Car Factory Alarm will go off? http://repairhelpcenter.blogspot.com/2012/01/toyota-avalon-factory-alarm-will-go-off.html
---------Car will not start security lock out? http://technoanswers.blogspot.com/2011/12/car-will-not-start-security-lock-out.html
---------Alarm will not disengage? http://technoanswers.blogspot.com/2012/01/ford-pickup-alarm-will-not-disengage.html
--------This will help.For more info keep updated.Thanks.

Feb 09, 2012 | 1998 Plymouth Voyager

2 Answers

I just installed an after market stereo in my impala.Now the starter doesn't engage. Is their a wire on the wire harness that affects this?

In the wiring diagrams there is a COMPUTER DATA LINES SYSTEM wire. From what I have read the radio won't cause the car not to start. Did you make sure you didn't drain the battery? Is the Theft Deterrent light on? If it is you're going to need a scanner to get the codes. This is what the Theft Deterrent system does with the radio.

I think if the Theft Deterrent light is on you will have to start there if not just diag a no crank condition.


Oct 31, 2010 | 2003 Chevrolet Impala

2 Answers

factory stereo code

Factory radio codes are an anti-theft deterrent, they are unique to each radio and car serial number, in order to get the code the dealer will have to access the manufacturers data base, you will need to pull the radio and record the radio model number and the serial number of the chassis of the radio and take it to the dealer, they will not in most cases give the info out over the phone, this would defeat the whole purpose of the code.

Oct 18, 2008 | 2000 Mitsubishi Eclipse

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