Monday, February 18, 2013

2006 Chrysler 300: Door ajar light is ON

FRONT DOOR DOOR AJAR LIGHT ISSUES:



The door ajar switches are integral to the front door latches.Its very common and very famous problem, noticed by many others too.
FIRST UNDERSTAND

WHY DOOR AJAR LIGHT COMES ON?

The ajar switch signal goes to the instrument cluster which also serves as the body control module. When the ajar switches close it applies ground to the circuit, the cluster sees this and turns on the interior lamps and the door ajar warning.

WHAT YOU HAVE TO SEE AND CHECK?

Inspect the front doors,are they closing properly or there seems to be difficulty to close the doors.Or there is any kind of blockage to the door area.
If your doors are closing properly, then unplug the door latch and see if warning light goes OFF or not.

Even after unplugging the latches doesn't turn the warning off then either the problem is internal in the instrument cluster or both of these ajar circuits are shorted to grounds somewhere in the wiring harness. The wires may be pinched or rubbed through on a grounded component, or it could even be from moisture in an electrical connector. There are many possibilities,check for all basics mentioned.


What you'll need to do next is check for a short to ground on both of these ajar circuits.If you find the ajar circuits are shorted to ground then unplug the cluster and see if the short goes away. If it does then the short is in the cluster and it will need to be replaced.

BUT, if the short is still there with the cluster unplugged then the problem is somewhere in the harness between the cluster and each of the doors.You will have to follow wire by wire to trace the faulty wire.
You can also use test light to check continuity to the wires. On shorted wire you will not get continuity.

This will help.
Thanks.