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Old 06-29-2014, 05:46 AM   #1
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Default Security Light

Hello friends ...
sometimes , when i start the car , the "Security" light stay ON . why ?
is not always happend .

Thanks
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Old 06-29-2014, 09:26 AM   #2
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Try re-synchronizing the remote by pushing the lock & unlock buttons down at same time on key FOB for 10 seconds, until lights flash & or horn honks etc.
This may solve the once in a while security light on problem.
How old is the battery in your key fob? Might want to install a new one as well.

Last edited by Soft Ride; 06-29-2014 at 09:28 AM.
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Old 06-29-2014, 09:56 AM   #3
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Didn't know the key FOB has anything to do with the security.

Last I knew, if the security light stayed on, but still allowed the car to run, indicated a malfunction with the system. Time for the dealer to look at it with a Tech2.
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Old 06-29-2014, 11:56 AM   #4
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I agree....if the problem happened after the car started, it'* kind of in "back up mode"....the car will continue to re-start, but the Security system is not on.....

One thing you don't want to do is disconnect your battery.....this resets the system......now if the fault is still there BEFORE YOU TRY TO START THE CAR, the car will not crank over......
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Old 06-29-2014, 01:19 PM   #5
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so ... how can i fix it ?
when i connected my car to the computer i saw P1626 .. what is mean ?
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Old 06-29-2014, 06:51 PM   #6
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I had to look this one up.

Quote:
DTC P1626 Theft Deterrent Fuel Enable Signal Lost
Circuit Description
The Vehicle Theft Deterrent (VTD) system is incorporated within the body control module (BCM). The powertrain control module (PCM) monitors the state of health serial data message from the Theft Deterrent system to ensure that the PCM to BCM communications is established. If the PCM detects a loss of the state of health message while the engine is running, DTC P1626 will set. DTC P1626 can cause a no-start condition or normal operation depending on when the loss of Theft Deterrent system communication was detected. The engine will continue to start and run if the condition that set DTC P1626 occurred after the PCM received a valid theft deterrent password from the BCM and already allowed fuel during the ignition cycle. The engine will start and immediately stall if the condition that set DTC P1626 occurred before the PCM received a valid theft deterrent password. With this condition present, the PCM will inhibit fuel delivery and disable the starter until a valid theft deterrent password is detected. Refer to Content Theft Deterrent (CTD) Circuit Description .

Conditions for Running the DTC
The Theft Deterrent system has allowed fuel delivery.

Conditions for Setting the DTC
The PCM has detected a loss of the state of health serial data message from the Theft Deterrent system.

Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

Conditions for Clearing the MIL/DTC
The DTC becomes history when the conditions for setting the DTC are no longer present.
The history DTC clears after 40 malfunction free warm-up cycles.
The PCM receives a clear code command from the scan tool.
Diagnostic Aids
For complete serial data line schematics and VTD system diagnosis, refer to Data Link Connector (DLC) Schematics in Data Link Communications and Vehicle Theft Deterrent (VTD) Operation in Vehicle Theft Deterrent.

An intermittent may be caused by:

A poor connection

Rubbed through wire insulation

A wire broken inside the insulation

Check for the following conditions:

Important: Several BCM diagnostic procedures call for disconnecting the BCM and then turning the vehicle ignition to the RUN position. These procedures will result in the PCM setting DTC P1626. Therefore, DTC P1626 stored in history may be the result of previous BCM diagnostic work.


Intermittent short circuit on the serial data circuit -- Refer to Data Link Communications Operation in Data Link Communications. Be sure to check all related wiring for an intermittent short to ground or short to voltage.

Poor connection -- Inspect the PCM and BCM harness and connectors for:

- Improper mating

- Broken locks

- Improperly formed or damaged terminals

- Poor terminal to wire connection

Damaged harness -- Inspect the wiring harness for damage. Check for an intermittent short or open circuit in the wiring harnesses related to the BCM, including the ignition, battery feed, ground, and Serial Data circuits.

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Step
Action
Values
Yes
No

1
Did you perform the Powertrain On Board Diagnostic (OBD) System Check?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check

2
Important: : If a loss of DLC data has already been diagnosed, clear this DTC and continue diagnosis with Powertrain On Board Diagnostic (OBD) System Check .


Is P1631, or UXXXX DTCs present?
--
Go to Diagnostic Trouble Code (DTC) List/Type
Go to Step 3

3
Important: : The replacement PCM must be programmed.


Replace the PCM. Refer to PCM Replacement/Programming .

Is the action complete?
--
Go to Step 4
--

4
Review and record the scan tool Failure Records data.
Clear DTCs.
Attempt to start the vehicle.
Does the vehicle start and continue to run?
--
Go to Step 2
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Old 06-29-2014, 07:12 PM   #7
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I was researching it as well. That is quite detailed!
I wonder since the light is not always on if it is a communications problem with PK ignition.
Maybe it would be best to simply clear that single code & see if it returns to turn the Secuity Light on again.
This site mentions -Anti-theft system fuel enable circuit (Passkey error) on P1626
General Motors OBD II Powertrain Diagnostic Trouble Codes P1500-P1699
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Old 06-29-2014, 10:10 PM   #8
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It is possible the ignition cylinders contacts for the system could be shorting/wearing out, or there could be problems with the BCM, or PCM wiring.
If the security like kept flashing it is possible it could just need a relearn done like Art mentioned, but the fact that the light stays on, and is not blinking rules that out.
When it starts and the light stays on it is in "Fuel Enable" mode, which is a fail safe designed to let the car keep running after started, the light remains on to let you know there is a problem present, so that you do not cut the car off and possibly get stranded.

I am pretty sure you have the PK III VATS, but I believe up to 2002 some vehicles still used PK II, does your key have a resistor pellet in the key?
I am pretty sure it doesn't, but I am asking just in case, because if it is I can help you determine if it is the ignition switch or not, as long as you have a multimeter, if it is PK 3 then I cannot really help, other than to suggest what has already been suggested.

Hopefully it is PK II, if so I know if you are fairly good with splicing wires than you could install a bypass, or if you are not comfortable splicing wires you could pay a little more and have VATS tuned out of the PCM, you'd lose your security all together bypassing VATS either way though.

I cannot remember exactly what the dealer charges to replace the ignition cylinder, and BCM if they have gone bad, I do know it won't be cheap unfortunately.

If it is PK II does anybody know if that can also be tuned out of the PCM like PK II can?
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