Kenwood KDC-248u installing in my 2003 Chevrolet Tahoe. Steering Control Wire

Is the air bag light lit on the instrument cluster ? Clock spring inside top of steering column , under steering wheel .
How Clockspring Works

Was Cruise Control working before the New Horn was installed? The power supply to the Horn, (input to ground wire) is connected to the Cruise Control Module (CCM). This CCM is wired to the Relay Switch Box located in the Engine Bay. The Relay Box cover will have a Chart indicating what function each Relay coresponds to. Your local autoparts store (AutoZone) can test the Relay Switch, and you'll know (if any Relay) need to be replaced.

The CCM is also wired to the Steering Wheel, but first passes through the Clock Spring Coil, located just behind the Steering Wheel. The Clock Spring allowes for the Function Buttons on the Steering Wheel to have power while Steering Wheel spins.

The Clock Spring can malfunction or break, its rare, but this will cut power to the Function Buttons on Steering Wheel. If ALL the buttons on Steering Wheel dont work, then the Clock Spring is the Culprit. The Coil may need to be replaced.

The Cruise Control Module itself may have failed and also would cause a few or all Steering Wheel Functions to quit working.

But first check the Relay Switch Box and examine the Harness Cables connecting (Steering Wheel--to--CCM--to--Relay Switch Box--to--Battery Supply).

Also if Cruise Control was working before the new Horn was installed and now not working, then most likely the Problem is a bad wire connection somewhere and/or is a faulty Relay.

(Any Questions/comments [email protected])

Most likely a broken wire in steering wheel

Many DIY'S like your self come unstuck when fitting after market equipment The systems are balanced in the ECM so any power feed that affects the ECM will result in problems. I suggest that you have a long talk with an experienced installer before you start or best advice get the shop that sold you the gear to install it for you.

I doubt Chevy Parts carries them. I'd get one and either search online for one that matches or go to Radio Shack.

there could be a broken wire in the steering wheel which would mean possibly having to remove the steering wheel but there will be an air bag that could go off which would be dangerous so its best left to the professionals unless you know exactly what you are doing as regards taking off steering wheels.

Before i took the steering wheel off i would locate the horn itself and unplug it and run a straight wire from each battery post and touch one wire to each contacter on the horn to make sure the horns not bad itself. But to take the steering wheel off you have to unbolt the airbag from the back remove it and then you should be able to check the horn contacter without pulling the steering wheel.

You can get the wire diagram on the link below page 18.

http://a248.e.akamai.net/pix.crutchfield.com/Manuals/113/113KDC248U.PDF

Multifunction Turn Signal Lever Replacement - On Vehicle

Removal Procedure

1. Verify that the multifunction turn signal lever is in the center of the OFF position.
2. Disconnect the negative battery cable.
3. Disable the SIR system.
4. Remove the steering wheel.
5. Remove the steering column trim cover.
6. Remove the steering column knee bolster.
7. Remove the steering column wire harness (1) from the steering column wire harness retainer (2).
8. Remove the 2 wire harness straps from the steering column wire harness (1).
9. Remove the steering column bulkhead connector from the vehicle wire harness.
10. Disconnect the connectors from the multifunction turn signal lever steering column bulkhead connector.

1. Remove the retaining bolts (1) from the multifunction turn signal lever (2).
2. Remove the multifunction turn signal lever (2) from the steering column.

Installation Procedure

1. Install the multifunction turn signal lever (2). Use a small flat-blade in order to compress the electrical contact and move the multifunction turn signal lever into position.
2. Verify that the electrical contact rests on the canceling cam.

Notice: Refer to Fastener Notice in Service Precaution.

1. Install the retaining bolts to the multifunction turn signal lever.

• Tighten the retaining bolts to 7 Nm (62 inch lbs.) .

1. Connect the gray and black connectors to the multifunction turn signal lever steering column bulkhead connector.
2. Connect the steering column bulkhead connector to the vehicle wire harness.
3. Install the two wire harness straps to the steering column wire harness (1).
4. Install the steering column wire harness (1) to the steering column wire harness retainer (2).
5. Install the steering column knee bolster.
6. Install the steering column trim cover.
7. Verify that the lever is in the center or the OFF position.
8. Install the steering wheel to the steering column.
9. Enable the SIR system.
10. Connect the negative battery cable.

I hope this helps you.

Thanks

look at the back side of your steering wheel you will see the screws that hold it in place . and just unplug the wiring.
when installing new remember to disconect the battery cable