Quote:
Originally Posted by ukpm
To anyone who's removed this connection:-
You've got to put it back in right away! The driver's airbag will not be deployed in the event of an accident unless the system can confirm that the seat belt is fastened! Airbags can be lethal if the occupant is not wearing a seat belt or they are wearing it and the pre-tensioner fails to operate.
Insurance cover will be invalidated if you disconnect this sensor. You've been warned.
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Not so.
The system is a link to earth, the switch wires to the buckle are red/blu and black, and the plug you pull out is yellow and black.
Fig 1: Pic from the SRS diagram, showing the wire colours to and from the plug/socket:
beltwiring.gif
Fig 2: Pic from the reminders diagram, confirming the operation of the switch (also tested by me by earthing the yellow wire manually):
beltwiring2.gif
There is no "person in seat" sensor on the drivers side.
When you have no belt in, the switch is closed, and the yellow wire sees earth.
When you put a belt in, the switch
opens, the yellow wire sees no earth, and the computer thinks you are belted in (and extinguishes the light and stops the beeps).
When you remove the plug, the circuit
opens, the yellow wire sees no earth, and the computer thinks you are belted in (and extinguishes the light and stops the beeps).
Pulling the plug is electrically the same as plugging your belt in. This is a cunningly wired circuit, so if the loop fails the circuit is left
open, and the car thinks you are belted in (a safer and quieter option, since the SRS is still active and you don't have to drive everywhere with the beeper going).
The only possible danger is an airbag deployment without you wearing your belt. But I'd guess the transit through your windscreen would be more of a worry.
The only reason not to do this mod, is if you feel you need the beeper to remind you to belt up. If you crash without your belt on, you are in all sorts of trouble, not only from the airbag deploying. If in doubt, don't do it and wait for me to post how to disable the beeper.