Hi Dave,

I had the air bag out while troubleshooting the horn
You explained before about the clockspring being the likely culprit
when the wheel is turned 90 degrees and the horn quits.
I got the air bag out and the clockspring seemed OK with the meter
I cleaned with alcohol and some Q-tips and it checked OK with the ohmmeter.
The horn schematic on pg 90 shows the clockspring, with no part #, a single
ring and wiper to the two horn switches to ground.
No horn relay? That's a suprise.
Then grounding the BL-SB wire to the horns did nothing.
So I replaced all 4 badly corroded horn bullet connectors.
Dave Barton to the rescue.

Now the horn is OK and on reassembly the SRS light is on.
You see in the horn schematic only a single connection for the clockspring
for the Horn switches. With the Horn and SRS switches lumped together as
item 3/37 Horn contacts

Now looking at SRS schematic there's the air bag 8/30
with a dual circuit via the clockspring C121 C92 C91 to the SRS module.
The wire colors from the airbag to C91 are missing.
I don't recall the C92 and C91 connectors being involved?
I noticed only a single pole contact wiper

In the SRS schematic in the instrument cluster there's a fuse 11/41
10/77 the SRS idiot light both working
and Blackbox 4/5 "HIC" Safety Circuit, SRS Airbag.
What's with that?

There's sketchy info available, and lots of suggestions to go to the dealer
for SRS issues.

Here's the 900 Volvo manuals that I could find listed for SRS
There's multiple manuals for the same model year.

SRS (Airbag) 940/960 1993 (TP-32224-1)
SRS (Airbag) 940/960 1996 (TP-8804031)
SRS (Airbag) 940/960 1996 (TP-8804201)
SIPS BAG 960 1996 (TP-8806201)
Supplemental Restraint System (SRS), 700/900 Including Pyrotechnical Seat Belt Tensioners for 1992 Model Year Only (TP-31404-1S-93)
SRS 940/960 1993 (TP-32181-1)
SRS (Airbag) 940/960 1993 (TP-32231-1)
SRS (Airbag) 940/960 1996 (TP-8804032)
SIPS BAG 960 1996 (TP-8806031)
SRS (Airbag) 960 1996 (TP-8808201)

Why so many manuals?

Thanks, Bill