I think it may be behind that plate on the airbag where the (4ea) 5/16 nuts hold it down. Like I said, "I think".

kind of what i think.

HAve given up on the horn issue for now. Put it back together . So going to work on the cig lighter issue ,,,, new thread coming up.

Still trying to find info, I came across one person saying the horn switch was not serviceable, and that you had to get another air bag, not sure if that is true though, they said special bits were needed to remove the air bag, and you should just get a used one, those things are not cheap though.

I found some info on the AIR BAG system though, not sure how much is relevant to your car, but some are relevant safety tips.

Disabling the SIR System.
"""The diagnostic energy reserve module or sensing and diagnostic module (DERM/SDM) can maintain enough voltage to cause air bag deployment for up to two minutes after the ignition switch is turned off and the battery is disconnected. Servicing the SIR system during this period may result in accidental deployment and personal injury.

Ensure front wheels are pointed straight ahead.
Turn ignition switch to LOCK position and remove SIR or AIR BAG fuse.
Remove left sound insulator. If necessary, remove courtesy lamp from sound insulator.
Disconnect Connector Position Assurance (CPA) and yellow 2-way connector at base of steering column.
On models with passenger'* air bag , remove right hand sound insulator and disconnect CPA and yellow 2-way connector from passenger'* inflator pigtail.
Wait at least 2 minutes before proceeding with diagnosis or service."""
----------------------------

Enabling the SIR System
The diagnostic energy reserve module or sensing and diagnostic module (DERM/SDM) can maintain enough voltage to cause air bag deployment for up to two minutes after the ignition switch is turned off and the battery is disconnected. Servicing the SIR system during this period may result in accidental deployment and personal injury.

On models with passenger'* air bag, connect yellow 2-way connector to passenger'* inflator pigtail, then install Connector Position Assurance (CPA) and righthand sound insulator.
On all models , connect yellow 2-way SIR electrical connector, then install Connector Position Assurance (CPA).
Install lefthand sound insulator.If necessary, install courtesy lamp to sound insulator.
Install SIR fuse, then turn ignition key to the RUN position and ensure that the "Inflatable Restraint lamp flashes seven to nine times and then turns off. If lamp does not operate as specified, refer to Testing and Inspection. """


Just did some more research, and I am pretty sure you are going to have to replace the airbag/switch as one assembly, that can cost around 500.00-700.00 from a dealer.