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Cannot figure out what that part is, but it has a vacuum line connected. Therefore, it should not be functioning unless the engine is running. I would have to guess there is a wire crossed in the key cylinder. The presence of the key should activate the warning system and perhaps deactivate the security system. However, the engine system wiring comes in proximity to the warning wiring behind the ignition switch near the contact reel. It's possible you have a short in that area. I am posting access instructions from autozone.com. CAUTION
Models equipped with a Supplemental Restraint System (SRS), use an inflatable air bag. Whenever working near any of the SRS components, such as the impact sensors, the air bag module, steering column, and instrument panel, disable the SRS.
Before servicing the vehicle, refer to the Precautions Section.
Disconnect battery cable.
Remove steering wheel and air bag module. Refer to Steering Wheel removal and installation.
Remove steering column covers. Remove or disconnect the following:
Screws from lower coverClip mounting between the upper and lower coversLower steering column coverUpper steering column cover
Remove the contact reel:
Disconnect the left connector.
Remove the screws.
Remove the contact reel.
Fig. Removing the contact reel from steering column
Removing the contact reel from steering column
if you hit the horn you should be able to thear the realy click, if not remove the horn pad and groung the wire, if it clicks the steering column has a bad ground, then remove the horn wire, its behind the right headlight unit lower down, and test voltage there, if good check horn ground, if all is good replace horn
Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF , unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.
Disconnect the negative battery cable.
Remove the steering column trim covers.
Remove the retaining screws from the multifunction switch.
Fig. Remove the multifunction switch (2) from the steering column
Remove the multifunction switch from the steering column.
Disconnect the electrical connectors from the multifunction switch.
Connect the electrical connectors to the multifunction switch.
Install the multifunction switch to the steering column while depressing the spring loaded horn pin.
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the retaining screws to the multifunction switch and tighten the screws to 36 lb inches (4 Nm).
Install the steering column trim covers.
Connect the negative battery cable.
Ensure that the multifunction switch functions properly.
This Is Park Lock Cable Failure here is the Replacment Procedure
Park Lock Cable Replacement
Disconnect the negative battery cable.
Remove the console.
Remove the knee bolster.
Loosen the lower steering column bracket bolts.
Lower the steering column.
Place the transmission shift lever in the PARK position. Important: Do not proceed to the next step with the key in any position other than the RUN position.
Turn the ignition key to the RUN position.
Insert a screwdriver blade into the slot provided in the ignition switch inhibitor.
Depress the cable latch. Pull the control cable from the inhibitor.
Push the cable connector lock button at the shifter base to the up position.
Unsnap the cable from the park/lock lever pin.
Depress the two cable latches. Remove the control cable latches from the automatic transmission control.
Remove the control cable clips.
Important: When installing a new park/lock cable, keep the shipping cover gauge attached until you are instructed to detach it. The shipping cover gauge will aid in the proper positioning of the cable.
Ensure that the cable lock button is in the up position. Place the shift lever in the PARK position.
Snap the control cable connector into the automatic transmission control.
Place the ignition key in the RUN position. Important: Do not insert the cable with the key in any position other than the RUN position.
Snap the control cable into the inhibitor housing until the snap lock is seated.
Remove the shipping cover gauge.
Turn the key to the LOCK position.
Snap the control cable end onto the shift park/lock lever pin.
Push the cable connector hose forward in order to remove any slack.
With no load applied to the connector nose, snap the cable connector lock button down. Important: Inspect for proper operation of the park/lock control cable before installing the steering column to the instrument panel.
Your going to need to remove the steering wheel and the steering column cover,then you can access the screws holding the "multi function switch",which is the new name for the turn signal switch ,since it does more now.
on cavalier and sunfires, the whole dash has to be removed to get the hvac unit out, steering column and all, they easy to get out after the dash removed, you will need a day or so for the whole job. after the hvac unit is out, you have to take it apart, there may also be a access door where the heater core sits that you may pull the heater core out.