Security light wont let me start

Tiny
STAR420J
  • MEMBER
  • 1998 GMC YUKON
  • 177,000 MILES
Switched motor in a 98 gmc yukon the truck runs for a second n shuts off how do I fix or bypass the problem. Is their a way I tryed to rest the computer by turning on n off for the 30 mins like a friend told me it did not work. Is their a wire I can cut or bypass? Without taking it to the dealer? Please help
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Wednesday, February 15th, 2012 AT 7:05 PM

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Tiny
WRENCHTECH
  • EXPERT
There is only one part of the system that can be bypassed but the rest of the system has to be functional. The sensor in the ignition lock is the most common failure and that is the only thing that can be bypassed.

Here s how you can bypass the sensor.

Go buy a 2.2k (2200 ohm) ohm resistor at an electronics store. Go to radio shack and just get one as close to that as you can. Remove the covers on the steering column and locate three small wires at the lock cylinder. Cut the yellow wire and the orange/black wire or on some vehicles, it s the yellow and black wires. Solder the resistor between those wires. Tape it up and put the covers back on and follow this relearn procedure. If this doesn't work you have a wiring problem in the steering column.
30 Minute Re-Learn Procedure
1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON (vehicle will not start).
3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds.
5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes ( the vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).
Important
The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
6. Start the engine (the vehicle has now learned the Passlock Sensor Data Code and/or password).
7. With a scan tool, clear any DTCs if desired (history DTCs will self clear after 100 ignition cycles).
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Wednesday, February 15th, 2012 AT 7:49 PM
Tiny
STAR420J
  • MEMBER
Thanks going to try that!
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Wednesday, February 15th, 2012 AT 10:21 PM

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