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Security Light

This is a discussion on Security Light within the Technical / Maintenance forums, part of the General Discussion category; I just purchased a 2001 Chev Silverado LT. I have a problem with the security light. It comes on & ...

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    Registered User Railroadhogger's Avatar
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    Security Light


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    I just purchased a 2001 Chev Silverado LT. I have a problem with the security light. It comes on & stays lit once in awhile when the truck is running. If I shut the truck off & restart it, the light then goes out. It sometimes comes on after when driving. I assume the security needs to be reprogrammed. Any suggestions? Wondering if it is an easy fix or do I have to bring it to the dealer. Truck is still under warranty. Thanks for replies
    Railroadhogger.
    2001 Chevrolet Silverado LT
    1998 Pontiac Grand Prix GT

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    CB1
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    Yes, that is a common problem. There is a TSB out on that and your dealer will know about it and correct it for you. I believe it has something to do with a bad solder connection. I have the same problem with mine, but it's out of warranty, and I don't really want to bring it to the dealer yet.
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    GMC Tech gmcsid's Avatar
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    Security Lamp Illuminated on the IP, Engine Stalls, No Start, DTC B2960 (Security System Sensor Data Incorrect but Valid) Set (Inspect and Repair Cause of DTC B2960) #01-08-56-002A - (06/19/2001)
    1999-2001 Chevrolet and GMC C/K Pickup and Utility Models (Silverado, Sierra, Tahoe, Suburban, Yukon, Yukon XL)

    This bulletin is being revised to add information on inspecting for electrical intermittent conditions and important connector C201 tightening steps. Please discard Corporate Bulletin Number 01-08-56-002 (Section 08 -- Body and Accessories).

    Condition
    Some customers may comment on the following conditions. These symptoms may be intermittent.

    Security lamp illuminates while driving. The Security lamp may be On or Off when the customer brings the vehicle to the service facility.
    The engine cranks but will not start and the Security lamp is flashing.
    The engine starts then stalls and the Security lamp is flashing.

    Cause
    Condition(s) may be due to an incorrect Passlockô sensor voltage received by the body control module (BCM) from the Passlockô sensor due to the following conditions. Most intermittent conditions are caused by faulty electrical connections or wiring.

    A 7 ohm variation in the sensor ground circuit wiring, circuit 1057
    A 100 ohm variation in the Passlockô sensor signal wiring circuit, circuit 1836
    Inspect for the following items:

    Broken wiring inside the insulation.
    A poor connection between the male and female terminal at the connector. Refer to Testing for Proper Terminal Contact under Testing for Intermittent and Poor Connections in Wiring Systems for the specific procedure.
    A poor terminal to wire connection. Some conditions that fall under this description include poor crimps, poor solder joints, crimping over the wire insulation instead of the wire itself, and corrosion in the wire to terminal contact area.
    Wire insulation that is rubbed through. This causes an intermittent short as the bare area touches other wiring or parts of the vehicle.
    A poor connection between the male and female terminal at a connector. This poor connection may be the result of contamination or deformation.
    Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector itself, or exposing the terminals to moisture and dirt can also cause contamination. Contamination, usually in the underhood or underbody connectors, leads to terminal corrosion, causing an open circuit or intermittently open circuit.
    Separate the connector halves.
    Visually inspect the connector halves for contamination. Contamination may result in a white or green build-up within the connector body or between terminals. This causes high terminal resistance, intermittent contact, or an open circuit. An underhood or underbody connector that shows signs of contamination should be replaced in its entirety including the terminals, the seals, and the connector body.
    Deformation is caused by probing the mating side of a connector terminal without the proper adapter, improperly joining the connector halves, or repeatedly separating and joining the connector halves. Deformation, usually to the female terminal connector tang, can result in poor terminal contact causing an open or intermittently open circuit. Using an equivalent male terminal from the J 38125-B, test that the retention force is significantly different between an good terminal and a suspect terminal. Replace the female terminal in question

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    Registered User Railroadhogger's Avatar
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    Hogger

    Thanks for the replies, will print out the post & give to dealer to look at.
    Hogger
    2001 Chevrolet Silverado LT
    1998 Pontiac Grand Prix GT

 

 

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