Introduction
This guide outlines troubleshooting steps for a Prado that will not start and appears to be immobilised, focusing on situations where the electrical system seems to be cutting out.
Problem
The vehicle’s engine will not start. When the key is turned, the electrics shut off, and the immobilizer light flashes. There is a potential loss of power to the vehicle’s systems.
Solution
The most common cause of this issue, indicated by the symptoms described, is a low or dead battery, or poor connection to the battery. The solution is to test, charge, or replace the vehicle’s main battery and ensure good terminal connections.
- Check Battery Voltage: Use a voltmeter to check the battery voltage.
- Clean Battery Terminals: Remove the battery terminals, clean them thoroughly, and reattach them securely. A loose or corroded connection can prevent adequate power flow.
- Battery Replacement: If the battery voltage is low or does not hold a charge, replace the battery.
Additional Checks
- Fuses: Inspect the main fuses. A blown fuse could cause a loss of power to essential systems.
- Key and Immobilizer: The key itself, specifically the transponder chip inside the key, is paired with the immobilizer system. The remote fob (for central locking) is separate from the immobilizer. Issues with the remote fob will not typically cause a no-start condition related to the immobilizer.
- Radio Security Code: Removing the battery may require you to re-enter the radio security code. The factory default code is often ‘000’.
Relevant Parts
- 12V Automotive Battery
- Voltmeter
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