Question about 1999 Oldsmobile Alero

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I have a 1999 Oldsmobile allero and I am having trouble with the theft lock, randomly my car will not start and then my security light will start flashing and I have to wait for about 15 min for the light to stop flashing when it stops flashing then the car will start again, this happens randomly

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You are experiencing GM passlock security system. Yours is starting to fail. When the system gets old it fails to communicate with all the parts of the system that need it. When the communication is broken, the car goes into anti theft mode and and turns off the starter and/or the injectors. After ten minutes it trys to connect the communication again, this is why it will work after a while. Go to this link, it has a ton of info and some ways to bypass this system so it will never happen again.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Jul 26, 2011

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Posted on Jan 02, 2017

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2 Answers

Security light is in 1999 Oldsmobile Alero but car seems to be running OK


The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://www.diy-gm-security.com/

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Mar 09, 2016 | 1999 Oldsmobile Alero

2 Answers

How to reset anti-theft on a 2000 alero


The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://www.diy-gm-security.com/

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Apr 04, 2015 | 2000 Oldsmobile Alero

1 Answer

1999 oldsmobile cutlass computer will not communicate with car


When the motor was replaced , was the original PCM changed as well ? Did you have the anti-theft system programmed . Theft - system light on -DTC'S - diagnostic trouble codes are stored . Need a factory or professional scan tool read these codes . The other computers on the vehicle will communicate . BCM
Important: Due to component variability, the vehicle theft deterrent (VTD) system must have the learn procedure performed regardless, if the vehicle starts on the first ignition cycle after a VTD repair.
All codes in the theft deterrent module must be cleared for a relearn.
The vehicle theft deterrent system is designed in order to prevent vehicle theft by disabling the fuel injectors unless the lock cylinder is correctly engaged by a mechanical key. The theft deterrent system uses the following 4 components for theft prevention:
• The lock cylinder
• The ignition switch
• The body control module (BCM)
• The powertrain control module (PCM)
When starting the engine, the PCM searches for a password from the BCM through the Class 2 serial data circuit. If the password is not recognized or not present, the PCM will disable the engine. Two modes of tamper detection are provided:
• No password received
The engine will start and stall quickly. SECURITY telltale will flash on the instrument panel cluster (IPC) and then stay ON steady.
• Incorrect or disable password received (More than 3 invalid passwords are received)
The engine is disabled for at least 10 minutes and the SECURITY telltale will illuminate solid on the IPC during the 10 minutes.
After the vehicle has passed theft detection, the PCM will continue normal operation.

DTC B2947 Security System Sensor Power CKT Low
DTC B2948 Security System Sensor Power CKT High
DTC B2957 Security System Sensor Data Circuit Low
DTC B2958 Security System Sensor Data Circuit High
DTC B2960 Invalid Coded Key Present
DTC B3031 Key Decoder Device in Assem Learn Mode
DTC B3033 Security System Indicates Tamper

Does pin # 16 at the DLC have B+ voltage ?

Mar 07, 2018 | 1999 Oldsmobile Cutlass

1 Answer

I 'v been this roblems over 3 years and spent so much money to fix it. My 1999 Oldsmobile Alero wont start with security theft light flashing. I have to wait for 10 minutes and then if i lucky it may...


SOUND LIKE THE THEFT SECURITY PROBLEMS. MOST OF THE TIME.THE IGNITION KEYS OR IGNITION SWITCH KEY LOCK CYLINDER WORN WHERE THE BCM AND PCM DONT RECOGNIZE KEY OR SWITCH SIGNAL.SO THE BCM AND PCM WILL GO IN THEFT SECURITY MODE.THE DEALERSHIP WILL HAVE TO FIX.BECAUSE IF THE KEYS , IGNITION SWITCH AND LOCK CYLINDER AND BCM HAS TO REPLACED.THEY WILL HAVE TO BE REPROGRAM USING DIAGNOSTIC EQUIPMENT. NOT A HOME FIX.YOU WILL NEED TO GET FIX SOON AS POSSIBLE.BECAUSE FAULTY SECURITY THEFT CODE WILL SHUT DOWN VECHICLE FUEL SYSTEM WHILE DRIVING OR IT WILL GET TO A POINT WHERE CAR WONT START NO MORE.THIS FIX WILL COST ABOUT $600.00.

Dec 23, 2010 | 1999 Oldsmobile Alero

2 Answers

Hi, the trunk won't open on my '99 Oldsmobile Alero. It's electrical, the anti-theft has kicked in and the key doesn't work and I haven't been able to break in through the back seat. The trunk release...


CHECK TRUNK FUSE AND RELAY ON THE INSTRUMENT PANEL FUSE BLOCK ON DRIVER SIDE ON SIDE OF DASH PANEL.IF FUSE RELAY OKAY THE TRUNK ELECTRIC OPEN SOLENOID SWITCH BAD.THE THEFT SECURITY HAS TO CHECK AT DEALERSHIP.MOST TIME WHEN YOU HAVE TROUBLE WITH IT.YOUR KEY OR SWITCH WORN ALSO BCM CONTROL MODULE.IF DEALERSHIP FIND FAULT IN THE THEFT SECURITY SYSTEM THEY HAVE TO FIX IT AND REPROGRAM IT.NOT A HOME FIX.

Sep 09, 2010 | 1999 Oldsmobile Alero

1 Answer

2000 Alero - Internal Security system malfunctioning. Sometimes (randomly) when I try to start the car it will not start and the red "security:" light flashes. I have to wait 10 minutes while the key is in...


The vehicle theft deterrent system is designed in order to prevent vehicle theft by disabling the fuel injectors unless the lock cylinder is correctly engaged by a mechanical key. The theft deterrent system uses the following 4 components for theft prevention:
• The lock cylinder
• The ignition switch
• The body control module (BCM)
• The powertrain control module (PCM)
When starting the engine, the PCM searches for a password from the BCM through the Class 2 serial data circuit. If the password is not recognized or not present, the PCM will disable the engine. Two modes of tamper detection are provided:
No password received
The engine will start and stall quickly. SECURITY telltale will flash on the instrument panel cluster (IPC) and then stay ON steady.
Incorrect or disable password received (More than 3 invalid passwords are received)
The engine is disabled for at least 10 minutes and the SECURITY telltale will illuminate solid on the IPC during the 10 minutes.
After the vehicle has passed theft detection, the PCM will continue normal operation.

Passlock™ Lock Cylinder
The Passlock™ lock cylinder is a locking cylinder that turns a rotating magnet past a stationary hall effect sensor. This action creates the Passlock™ cylinder data. The Passlock™ cylinder data is sent to the Body Control Module (BCM). The Passlock™ lock cylinder is interfaced with the BCM via a 3-wire connection:
• Power
• Ground
• Data

Powertrain Control Module (PCM)
The Powertrain Control Module (PCM) is located on the lower left side of the instrument panel.
The PCM communicates with the Body Control Module (BCM) via serial data over the class 2 serial data bus, CKT 1807. When the BCM determines a passed theft condition, the BCM sends a coded password to the PCM. When the PCM receives the correct password, the PCM enables the fuel injection system, allowing the vehicle to operate correctly. The PCM may allow the car to start and quickly stall during a failed theft condition.
The following conditions may cause the PCM to enter a tamper mode:
• A bad timing cycle
• An incorrect password
If the BCM does not receive a password within a preset time window, the BCM will enter a short tamper mode. During this mode, the PCM will not allow the car to operate for 4 seconds.
If the password is incorrect, the PCM will enter the long tamper mode. In the long tamper mode, the following actions will occur:
• The THEFT SYSTEM indicator will flash.
• The fuel injectors will be shut off for approximately 10 minutes.
Although the vehicle may start, the engine will quickly stall due to a fuel cut-off.
In the event of an open in the serial data communication between the BCM and the PCM, the following actions occur:
• The PCM will become fail-enabled if the car has already passed theft for that ignition cycle (i.e. the engine is running).
• The PCM may set the diagnostic trouble codes (DTC).
• The THEFT SYSTEM indicator will light continuously.
• The PCM will become fail-enabled for future ignition cycles.
If a failure occurs in serial data before the ignition cycle, while the PCM is not fail-enabled, the PCM will never receive a valid password in order to enable the continued use of the fuel injectors.

Your best bet , take to a qualified repair shop .
DTC B2947 Security System Sensor Power CKT Low
DTC B2948 Security System Sensor Power CKT High
DTC B2957 Security System Sensor Data Circuit Low
DTC B2958 Security System Sensor Data Circuit High
DTC B2960 Sec Sys Sensor Data Incorrect but Valid
DTC B3031 Security System Controller in Learn Mode
DTC B3033 Security System Indicates Tamper

Aug 12, 2017 | 2002 Oldsmobile Alero

2 Answers

99 Alero Passlock and starting problem


YOU CANT BYPASS PASS KEY ANTI THEFT SECURITY SYSTEM.ITS PART OF THE PCM.IT WAS MADE WITH CAR.THATS WHY YOUR CAR NOT CRANKING.THE SECURITY THEFT SYSTEM SHUT DOWN FUEL SYSTEM.THE DEALERSHIP HAS TO FIX. IF YOUR IGNITION SWITCH KEY CYLINDER LOCK OR KEYS ALSO THE BCM FAULTY.THE DEALERSHIP HAS TO REPLACE FIX THEM AND REPROGRAM TO PCM IN ORDER FOR CAR TO CRANK.

Jun 26, 2010 | 1999 Oldsmobile Alero

1 Answer

2008 nissan altima will not start. the lights come on but it will not start


YOUR CAR 2 YEARS OLD STILL NEW.PROBLEM COULD BE STARTER SOLENOID.ALSO FAULTY NEUTRAL SAFETY SWITCH OR CAR IN THEFT SECURITY MODE.CHECK THEFT RELAY.

Apr 27, 2010 | 1999 Oldsmobile Alero

2 Answers

1999 secuirty system allero


Here is a step-by-step procedure:

Pry up the plastic molding from around the Radio/HeaterAC controller and from around the Gear Shifter. Detach the HeaterAC module from the molding by removing the four 7-mm hex bolts from the back side. Take out the 3 7-mm hex bolts to loosen the Radio. Put key in ignition & turn to "On" position, apply brake, and shift into "drive" or lower gear. Turn HeaterAC module to the left, sideways orientation, and pull out the Radio. Disconnect main wiring harness from back center of Radio if there is not enough slack to take the Radio out past the plastic molding. Leave the antenna connected. Look inside and to the left at the back of the Ignition Cylinder assembly. Locate the THIN YELLOW WIRE which is bundled alongside the thin white and the thin black wire. You may have to stick you hand in and fish a bit to grab this "Thin wire Trio". DO NOT mess with the main rear/downward ignition wiring harnesses (1 of which contains a Thick Yellow Wire - leave it alone).

Isolate the THIN YELLOW WIRE from the 2 others. As a precaution, RECONNECT the MAIN RADIO WIRE HARNESS, and let the Radio hang to the right side. Put the key in the ignition, and put the car back in PARK. START THE CAR. CUT THE THIN YELLOW WIRE with the car running. Tape both ends of the cut wire. Place black electrical tape over the "Security" light (less annoying). Turn off the car engine. Disconnect the Radio main wire harness to Re-Install the Radio, if necessary. You may need to crawl under the passenger-side dash to push the main wire harness back into the radio while holding the Radio from the front. The rest of the installation is the reverse of removal. YOUR LIFE JUST GOT A LOT BETTER if you want to keep driving this car !!

Aug 19, 2009 | 1999 Oldsmobile Alero

2 Answers

1994 oldsmobile 88 won't start,lights,battery,starter ok.security light comes on.no manual to car. I have a 1991 oldsmobile 88. We have replaced the battery and had a new starter placed as well. Security...


Yes, the key,ignition, or Theft Deterrent Module is not funtioning properly. You can start changing these out 1 by 1, or bypass the whole system for about the cost of a new key. This link explains and will help you.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Apr 10, 2009 | 1991 Oldsmobile 88

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