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Seatbelt Warning Module Constantly Beeping

Looks like the problem is some sort of failure in the little box under the drivers seat that controls the passive seatbelt system. This little box has all the relays and logic in it to control the movement of the belts using the door switches, and little switches on the belt tracks to tell the box when to move the belts, and in which position the belt is in, and whether or not the belt is locked in place. This box has one wire that runs from it to the instrument cluster to turn the little seatbelt light on and off. It also has 2 wires that run to the cars ECU that control that little beeper that comes on if you leave your lights on, or when the belts have not reached their fully locked position after you get in the car and close the door.

Solution: If you are somewhere in the states I would take the car to the dealer and tell them you are having problems with the passive restraint system, and that there is a recall to have this system including I would assume the little control box checked out completely. If the seatbelt system is under warranty for life like I have read on this egroup then they should honor this request free of charge.

If you can not get to a dealer from the states, like me and other non-stateside MX3ers, then I have come up with a way to disable the light and the beeper. It involves taking the 4 bolts that hold the drivers side seat out, removing the seat, taking the connector off of the seatbelt control box, and using a small flat tip screwdriver to extract 3 pins, the above 3 pins that I mentioned above that control the light and beeper. Here is a link to a picture of the connector showing the 3 pins(highlighted in little grey boxes) that must be removed:

Seatbelt Control Box Connector

Here is a picture of the entire seatbelt control schematic diagram:

Seatbelt Control Box Circuit Diagram

Of course there is also the option of buying a replacement control box if the dealer blows you off, and you don't feel comfortable disabling the little warning light and beeper. I understand the fear that without the warning light and beeper we will not know if the seatbelt control box is working correctly, and since our shoulder belt working correctly, and "safely" is in the frey on this problem. I personally don't mind the risk because I can hear my seatbelts lock when they come all the way back in the tracks, and I pull on them and they don't move a inch.

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Last modified: October 26 2007

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