SECURITY LIGHT 1998 CHVY Z71

Asked by Guru9MV6Q9 Jan 12, 2023 at 05:38 AM about the 1998 Chevrolet C/K 1500

Question type: Maintenance & Repair

TRUCK WAS RUNNING FINE. ONE MORNING I GO TO
START IT , IT WLD CRANK BUT WLDNT START. TRIED A
FEW MORE TIMES..NOTHING. I ACCIDENTALLY LEFT
HEADLIGHTS ON BEFORE I WENT INSIDE AND LAID
BACK DOWN. (was gna try again later with the truck).

After realizing wat i had done, now ever since then
when i put in my key and turn it to (any poistion) to on,
(after my gauges do the bulb check), MY SECURITY
LIGHT STAYS ILLUMINATED.  

Ive already tried, 10mins X3 , 11 x3 procedures,
unhooking the battery for a cpl hours, checked fuses
and relays, my fuel pump has power and hums wen i
turn the key over.. etc etc... THE ONE THING IS THAT .Y
SECURITY LIGHT STAYS ILLUMINATED BUTTTT IT
NEVER FLASHES OR GOES OFF....NOT AFTER 10MNS
11MNS 30MNS NOTHIN..

one more thing
..ever since...if i wanna get out there n try tk solve thks
problem then i have to have jumper cables to give my
battery power, but once i remove the cables it soon
lpses power again...IVE HAD THE BATT TESTED,
GOOD. THE ALT TESTED, GOOD.

NEW BATT? NEW KEY? KEY CYCLINDER? PCM?
I HONESTLY THINK IF I CLD RESET MY ANTI THEFT
SECURITY THRU A COMPUTER WLD THAT FIX IT...?
IDK


APPRECIATE THE TIME AND ANY HELP OR IDEAS OF
WHAT TO TRY OR ROUTES TO TAKE.

2 Answers

120

This is a very common problem on GM vehicles. The security system is notoriously known to fail. Basically when you insert your key, the system checks for a certain signal. If the system cannot get the correct signal from the key, it assumes the key is incorrect or you are attempting to hotwire it. The system then goes into SECURITY lockout mode. (prevents vehicle theft) This will either turn off the starter, or the fuel injectors. This has been happening with GM's for a very long time. There is a company called Newrockies inc. that sells a bypass for this online. Works great.

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