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Dear jd620,
Hope you're well and stay so. Volvo Service Manual #32231/1 (Section 8 ⏤] SRS [Airbag]), p. 140, instructs:
"The sensor unit should always be replaced if:
Diagnostic Trouble Code (DTC) 1-1-2 has been stored or
The DTC cannot be cleared when the car has been repaired - there is still a fault in the sensor unit or
The sensor unit is mechanically damaged or
There is mechanical damage to the floor of the car in the area of the sensor unit, which could weaken the sensor unit mountings. Remove the sensor unit and check that its mountings are not cracked." This is a verbatim quotation.
These instructions suggest that you should replace all expended units: both airbags, both seat-belt tensioners, all wiring (fluorescent orange), the steering wheel, and the "clock-spring" connector to the in-steering wheel airbag. If, after doing all this you do not see DTC 1-1-2 code, all's well with the sensor module.
Note: the SRS cable to the in-dash passenger-side airbag is secured - behind the center air-vents - with a heavy-duty black plastic cable tie.
To cut the cable tie, I converted an old hacksaw blade into a "hook-knife". Using a hand-held electric grinder (e.g., a Dremel) and an emery cutting disc, I formed a hook at one end of the blade: I cut a slot from the toothed-edge of the blade to a blade mounting hole. I sharpened the hole's edges using the electric grinder and a small abrasive stone.
To cut the cable tie, I put the hook-knife behind the cable tie and tugged until it cut through the plastic. This wasn't easy, but saved me having to remove the air vents to get better access.
Hope this helps.
Yours faithfully,
Spook
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