Ive installed mechanical switches in the rear seatbelts and wired them to the LEDs in the mirror to warn the driver on the status of the belts. The unused (early model) DIM seatbelt icon now warns the driver that the driver/front passenger is unbuckled.
Its not always possible to hear/turn around while driving to see if passengers have unbuckled their seatbelt.
Volvo had this in mind i believe when they designed the car as manufacturers get extra ANCAP points for warning lights, but maybe volvo didnt need extra points or they kept it for marketing later models. I know this was done on the V50 but not sure about the P3 V70 is could have very easily and cheaply been a safety upgrade by volvo all it would need is 3 sensors and a software update.
WARNING
*dashboard/mirror LEDs run on 5volts
*if your car has switchable on/off airbags (XC90), one LED light is to be kept for that "airbag off" warning icon.
- rear seatbelt switch
- mechanic seatbelt switch.jpg (75.88 KiB) Viewed 593 times
- rearview led modification
- rearview led display modification xc70.jpg (208.75 KiB) Viewed 593 times