Troubleshooting the 1990 Toyota Celica Security System

Written by alec cunningham
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Troubleshooting the 1990 Toyota Celica Security System
One reason for a car not starting is problems with the security system. (Jupiterimages/Polka Dot/Getty Images)

The security system on a 1990 Toyota Celica is created with the protection of the vehicle in mind, but like on all vehicles, it can cause some problems. One of the major problems that occurs with a security system is the inability to start your car. If this happens, your security system might be signalling that there is a problem. The following is a list of troubleshooting options to try before taking your car to a professional.

Skill level:
Moderately Easy

Things you need

  • Spare key
  • 1990 Toyota Celica owner's manual
  • Security system relay
  • 1990 Toyota Celica electrical diagram
  • Wire cutters
  • Soldering iron
  • Bypass wire

Show MoreHide


  1. 1

    Find a spare key that has not been used as often. Sometimes the microchip will wear out in your primary key. In this situation, taking the primary key to a Toyota dealer for reprogramming is necessary. A spare key's microchip will most likely still be good since it has not been used as regularly.

  2. 2

    Turn the ignition to the "On" position in your Celica. Wait 15 minutes in order to reset the pass lock system. If this has been successful, the light will stop blinking. Turn the key to the "Accessories" position, and to the "Off" position within 3 seconds. Remove the key from the ignition. Wait for a few seconds before turning the car on as you normally would.

  3. 3

    Install a relay that will bypass the malfunctioning security system if your car has a remote starter. Contact your Toyota dealer or installer for additional information about the installation procedure. If your car does not have a remote starter, find an electrical circuit diagram created specifically for your 1990 Toyota Celica. Locate the security immobiliser circuit on the diagram, and cut the circuit using wire cutters. Then use a soldering iron to solder the bypass wire into its place. Test the installation's result by attempting to turn on your car.

  4. 4

    Visit a Toyota dealer or a local hardware store if you have installed a new ignition switch or lost a key to your car recently. All Toyota dealers are able to create a duplicate of a key that has been microchipped, but generally only some hardware stores are able do so. Consult a Toyota expert if you are unable to solve the security system problem on your own.

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