How to Tell What is Causing Your Volvo 940 Door Jamb Switch Problems
Your Volvo 940 door jamb switch serves a very important security function. When you quickly close the door without bothering to check whether it's closed properly or not, the door jamb switch is there to help. It keeps the dome light on when it detects that your door is not properly closed. One more important function of the door jamb switch is to let you see inside the cabin by lighting it up when you open the door. When your door jamb switch fails, it can mean disaster for you. Here are some common problems with this car part and how to properly diagnose their causes:
Flickering interior lights
One of the common problems when it comes to door jamb switches is intermittent flickering of lights. One way to diagnose this correctly is to check if the door jamb switches are maladjusted. You will need to take apart a portion of the door, along with screws and an access plate, to access the door jamb switch. Check for rust, corrosion, or simply lack of lubrication on each of the door locks. These factors cause the door jamb switch to go out of adjustment. A few sprays of WD-40 will help lubricate the doors' locking mechanism and should fix the problem. In other cases, the defective switches may require replacement because they are self-adjusting. It will be necessary to run wiring to the door. Note that before doing anything on the door panels, power should be cut to the circuit for safety.
Interior lights stay on
Some car models may have lights that stay on for a short period of time after the door is closed to provide ambient safety lighting for car occupants. However, it usually is a symptom of a bigger problem when lights don't shut off immediately after the door is closed. When this happens, you need to check and isolate which door is causing the problem. You can start doing this by turning on the ignition switch and rolling down your windows. Open and close each door and listen to the sounder-hearing it means the door switch is good.