98 Blazer Intermediate Starting

[MT-2500]

Originally Posted by nuckolls_7

i went out this morning and it finally started again. i let if run for a few minutes and when i came back the security light was on. i drove it for about 30 or 40 minutes and it didn't go off. is this a sign of a security problem?

Yes it sure is.
While light is on
Get it on a engine /body computer capable scanner and look for your problem.
Check fuel allowed or not allowed.
Post back any present or history body or engine or security system codes.
They should point to the problem

Did the key on 3 times relearn help any?

Does this one have the pellet in the ign key?
And make sure there is not any after market alarm or remote start systems on it.

Let us know codes and how it goes.

[MT-2500]

File In Section: 08 - Body and Accessories
Bulletin No.: 01-08-56-001A
Date: June, 2001
Subject:
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)
Models:
1998-2001 Chevrolet and GMC S/T Pickup and Utility Models
(S10, Sonoma, Blazer, Jimmy)
1998-2001 Oldsmobile Bravada
This bulletin is being revised to add information on inspecting for electrical intermittent conditions and important connector C211 tightening steps. Please discard Corporate Bulletin Number 01-08-56-001 (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.
Security lamp is illuminated.
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 Passlock(TM) sensor voltage (which is intermittent) received by the body control module (BCM) from the Passlock(TM) 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 Passlock(TM) 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 a 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 surface 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 contact 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 a good terminal and a suspect terminal. Replace the female terminal in question.

[nuckolls_7]

i finally got in back in the shop to see whats going on with it. they hooked it up and found a BCM code in the history of B2958. hopefully they find out the cause. i will keep you all updated.

[MT-2500]

Originally Posted by nuckolls_7

i finally got in back in the shop to see whats going on with it. they hooked it up and found a BCM code in the history of B2958. hopefully they find out the cause. i will keep you all updated.

B2958 is security system sensor high voltage.
The TSB in post 17 may be some of your problem.
If shop does not have that TSB copy it off and give it to them.
Let us know how it goes.
Good Luck