Door Open Indicator Stays On After Remote Unlock/Ignition Off (90 Series Prado)

Toyota Prado 90 Series
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Problem

The red “door open” indicator light on the instrument panel illuminates incorrectly under these conditions:

  • Immediately after unlocking the car’s doors via the remote central locking fob.
  • After driving, as soon as the ignition is turned off (before any doors are opened).

The light goes out when the doors are locked via the remote fob. Unlocking with the key doesn’t cause the issue.

Cause

The issue stems from the aftermarket remote central locking system (Viper 211HV or Viper 412), specifically the dome light supervision wiring. The installer may have connected the dome light supervision wire directly to the door trigger, causing the false “door open” indication.

Solution

There are two potential solutions:

  1. Disable the Dome Light Supervision Feature: Program the Viper 211HV/412 to turn OFF the dome light supervision feature. Consult the Viper 211/412 installation manual for instructions.
  2. Correctly Wire the Dome Light Supervision Feature with a Relay: This allows the dome light to function without triggering the door open indicator. THIS IS THE RECOMMENDED SOLUTION

Detailed Wiring Solution

This solution requires an automotive relay.

  1. Cut the wire going to the dome light in half.
  2. Connect the end of the wire going to the dome light to relay pin 30.
  3. Connect the other end of the cut wire (the side coming from the vehicle’s wiring harness) to relay pin 87a.
  4. Connect relay pin 87 to ground.
  5. Connect relay pin 86 to a constant 12V+ power source.
  6. Connect relay pin 85 to the Viper’s dome light supervision wire (Black with a White trace).

This wiring configuration will allow the dome light supervision feature to function correctly without triggering the door open light on the dash. It will also prevent the headlight buzzer from sounding when the key is turned off with the headlights on.

Simpler Diode Based Solution (Not Recommended)

A simpler solution involves the use of a diode. However, this method is not recommended due to the potential for the diode to overheat if the dome light is left on for extended periods, especially with non-LED interior lights.

This technical summary was auto-generated based on recovered archives. Do not rely on its factual accuracy. Refer to the original thread. Source: View Original Conversation

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