Changed rack and pinion. when turning wheel to right horns started blowing. unplugged airbags and horn stopped. drove truck for 1 day now wont start and dome light is blinking and warning lights on dash are blinking

Sounds like the button under the steering wheel airbag or the clock spring iteslf is stuck.

I suggest taking it right back to the shop that changed the rack and have them fix it.

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Could be a wiring problem or the clockspring in the steering column.
You would need to pull the steering wheel and test the circuits.

did you disconnect battery ? bet you did ! you need to reset anti-theft ,disconnect battery again but first open drivers side window all the way and keep keys in your hand (auto locks may lock doors )reconnect battery when lights and horne go off put key in drivers door and turn open lock open lock 3 times that should reset it.

I verify its not a stuck relay...

I disconnect connector under dash and horn stops...

I then suspect its the Horn contacts or a worn grounded wire in air bag/horn switch assembly in steering wheel.

The decorative Vinyl cover shrinks with age...presses on horn contacts against air bag.

I Disconnect Air bag connector (identified as Yellow wire and Connector) usually under dash.

WARNING: ( I Do not - I DO NoT probe the yellow harness/connector with a meter or test light. A test light WILL Detonate my air bag, and impale the bracket in a nearby object/person - me.)

I Removed screws (2) behind steering wheel - which allow air bag horn assembly to be removed.

I Disconnect Air bag connector in this location as well (identified as Yellow wire and Connector) and then;

The red (color varies) and black Horn wires will be plugged into ribbon connectors usually (2) two that feed/connect to contacts for horn function on face of air bag.

I pause here and verify horn will stop blowing when I disconnect the wires going to horn contacts. So I get horn blowing again...

Check horn: To verify this is the cause; I reconnect (whatever fuse/relay/ connector (Not the airbag connector) I disconnected so they will stop blowing) and get horn/s so they are blowing again...

Then I disconnect the ribbon connectors to verify blowing stops.

Note: The experience I had with horn on

Buick Park Ave was at night when temperature cools after hot day, the vinyl cover shrank and horn blows... pressing on horn area of steering wheel firmly would stop horn briefly - then continue.

Note: I will need a rivet tool and rivets... to reassemble.

WARNING: I Do not drill into airbag explosive container. If I do not know how to carefully drill off correct rivet heads and remove vinyl decorative cover from air bag/horn... I STOP and go to the junkyard or ebay and purchase/replace the airbag/horn assembly.

I continued by drilling out rivets (the rivets holding vinyl cover) by using a drill bit as large (or smaller) as the head of rivet and drill gently to release head from rivet body/shank.

I mark all pieces with a magic marker to verify I reassemble right side up (all metal brackets and trim plates and cover).

I Remove vinyl cover exposing horn contact pads which were sandwiched between cover and air bag container.

I used a razor blade to remove vinyl honeycomb material from area of vinyl cover - that when pressed - would activate horn/contacts.

Only a 1/16 of an inch or less needs to be removed.

(I Bend cover inside out and shave material off of area slowly. Care not to cut myself.)

I Reassemble in reverse order with rivets.

Check horn: ...function at this point... by plugging in horn connectors and assure horn contacts work properly as expected.

while replacing a rack on any car with a airbag made into the steering column you have to make sure the steering wheel does not move while changing out the rack.......if it moves buy itself or lets just say someone was to move it for a joke and it gets out of position and after you put everything back together and turn the steering all the way the wires in the spiral cable will stretch and break...i have seen this happen all the time when you are working on the steering system....the spiral cable will turn 2.5 turns in each direction when you are installing a new one and if it is installed .5 to 1 turn out then when you drive the car and turn the wheel lock to lock the wires are going to stretch and break.....i would have to say that whoever installed the rack has caused all of your other problems and if it was the company i work for they would take care of it for you...i hope that this info was helpful and if i can help you in any other way let me know and if you would also let me and fixya know if i was of any help to you and a comment and a comment would be appreciated...thanks and good luck...have a blessed day......

Hi, assuming you have cruise controls on the steering wheel, I would say your clockspring has failed. The contacts for the horn must be crossed with the cruise contacts. Replacement requires removal of the steering wheel (special tool) and airbag, etc. Please let me know if you would like instructions.

The airbag in the steering wheel is binding on the horn button during the airbag self-check when you turn on the ignition.
It is not owneer repaitable; take to the dealer.
Be careful, in that some shops may disconnect the airbag.

sounds like a problem with the HORN CONTACT / SIGNAL SWITCH under ther steering wheel. Hope this helps