Wiring harness install 93 sierra

Remove the covers below the steering column. Locate the wiring harness mounted to the steering column. Follow the wires toward the steering wheel. You should be able to locate the separate 3 same size wire harness for the cruise control. The wires from the switch handle run alongside, on the inside of the column with your turn signal wires.

The Buick Century is equipped with a multi-switch. This switch is an all in one switch that controls your cruise control, windshield wipers and turn signals in one switch. This switch also controls dimming and brightening of your headlights. The dimmer switch is simple to replace, and all you need is a phillips head screwdriver to complete the task.

1. Removing the Steering Column Shroud
   • Removing the dimmer switch starts at the steering column. To plan this task out, access the steering column by removing the screws holding the steering column shroud in place. This will expose the turn signal lever. Remove the lever by twisting it forward, and pulling it out of the switch.
     
   Removing the Dimmer Switch
   • The switch is held on by two screws and a wiring harness. The wiring harness can be removed by prying up on the locking tabs and pulling the connector out of the socket. The two screws can be removed with a phillips head screwdriver. The switch will slide out. To install a dimmer switch, be sure to repeat these steps in reverse order.
     

If both ways cause it, I would say check them steering both. The problem is in the wiring harness though. You probably can see melted wires.

Ignition Lock Cylinder REMOVAL & INSTALLATION NOTE: On 1974-76 models, equipped with A.C.R.S. perform the special procedure for removing the air cushion module from the steering wheel if necessary, prior to removing the lock cylinder. Standard Steering Column

1. Remove the steering wheel.
2. Remove the lockplate cover assembly.
3. After compressing the lockplate spring, remove the snapring from the groove in the shaft. CAUTION
   When the snapring is removed do not allow the shaft to slide out the bottom of the column.
   
4. Remove the lockplate, then slide the turn signal cam and the upper bearing preload spring off the upper steering shaft.
5. Remove the thrust washer from the shaft.
6. Remove the hazard warning switch from the column along with the turn signal lever.
7. Use the following procedure if the car is equipped with cruise control.
   1. Attach a piece of stiff wire to the connector on the cruise control switch harness.
   2. Gently pull the harness up and out of the column.
8. Remove the turn signal switch mounting screws.
9. Slide the switch connector out of the bracket on the steering column.
10. After freeing the switch wiring protector from its mounting, pull the turn signal switch straight up and remove the switch, switch harness and the connector from the column.
11. Turn the ignition switch to ON or RUN, then insert a small drift pin into the slot next to the switch mounting screw boss. Push the lock cylinder tab and remove the lock cylinder.
12. Installation is the reverse of the removal procedure. Fig. 1: Ignition lock removal - standard column
    

Tilt Column

1. Remove the steering wheel.
2. Remove the rubber sleeve bumper from the steering shaft.
3. Using an appropriate tool, remove the plastic retainer.
4. Using a spring compressor, depress the upper steering shaft spring and remove the C-ring. Release the steering shaft lockplate, the horn contact carrier, and the upper steering shaft preload spring.
5. Remove the four screws which hold the upper mounting bracket, then remove the bracket.
6. Slide the harness connector out of the bracket on the steering column. Tape the upper part of the harness and connector.
7. Disconnect the hazard button and position the shift bowl in Park. Remove the turn signal lever from the column.
8. Use the following procedure for cars with cruise control.
   1. Remove the harness protector from the harness.
   2. Attach a piece of piano wire to the switch harness connector.
   3. Before removing the turn signal lever, loop a piece of piano wire and insert it into the turn signal lever opening. Using the wire, pull the cruise control harness out through the opening.
   4. Pull the rest of the harness up through and out of the column.
   5. Remove the guide wire from the connector and secure the wire to the column.
   6. Remove the turn signal level.
9. Pull the turn signal switch up until the end connector is within the shift bowl. Remove the hazard flasher lever. Allow the switch to hang.
10. Place the ignition key in the run position.
11. Depress the center of the lock cylinder retaining tab with a small prytool, then remove the lock cylinder. On some model remove the lock cylinder retaining screw. To install:
    
12. When assembling the lock cylinder, rotate the key to the stop position while holding the cylinder and push the cylinder in all the way.
13. Install the retaining screw on those models so equipped, and tighten to 40 inch lbs. (4.5 Nm).
14. Install all components in the reverse of the removal procedure order. Check switch for proper operation. Fig. 2: Installing ignition lock - tilt column
    

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

Turn Signal Switch REMOVAL & INSTALLATION CAUTION
Some models covered by this manual may be equipped with a Supplemental Restraint System (SRS), which uses an 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. Deville, Eldorado, Seville, and Fleetwood - Early Models

1. Disable the SIR system.
   1. On Deville and Fleetwood, remove the left lower sound insulator. On Eldorado and Seville, remove the left side sound insulator.
   2. Remove the Connector Position Assurance (CPA) and detach the yellow 2-way connector at the base of the steering column.
   3. Remove the steering wheel.
   4. Make sure the ignition switch is in the LOCK position to prevent the SIR coil assembly from going off-center.
2. Remove the SIR coil assembly retaining ring and the coil assembly. Allow the coil to hang freely. WARNING
   The SIR coil assembly will become off-center if the steering column is separated from the steering gear and is allowed to rotate or if the centering spring is pushed down, letting the hub rotate while the coil is removed from the column.
   
3. Remove the wave washer.
4. Use tool J-23653-C or equivalents, to depress the shaft lock, then remove and discard the shaft lock retaining ring.
5. Remove the shaft lock.
6. Remove the turn signal canceling cam assembly.
7. Remove the upper bearing spring, upper bearing inner race seat and inner race.
8. Move the turn signal switch to the RIGHT TURN position.
9. On Deville, Fleetwood, and 1990 Eldorado, and Seville, remove the multi-function turn signal lever as follows:
   1. Make sure the lever is in the OFF position.
   2. Remove the access cover from the steering column housing.
   3. Detach the cruise control wiring connector. Note the position of the connector when installed in the column.
   4. Pull the lever straight out of the turn signal switch.
10. On Eldorado and Seville, remove the multi-function turn signal lever as follows:
    1. On 1992-93 vehicles, slide the connector cover toward the front of the vehicle.
    2. Unplug the electrical connector. On 1991 vehicles, note the position of the connector when installed in the column.
    3. Push the lever straight in, rotate clockwise 1?4 turn and pull the lever out of the switch.
11. On Deville, Fleetwood, and Eldorado and Seville, remove the screw, button, spring, and hazard warning switch knob.
12. On Deville and Fleetwood, remove the one signal switch arm retaining screw. On Eldorado and Seville, remove the 2 signal switch arm retaining screws. Remove the signal switch arm.
13. Remove the turn signal switch retaining screws.
14. Remove the wiring protector and detach the turn signal switch connector.
15. Gently pull the wire harness through the column and remove the turn signal switch.

Removal & Installataion

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 (air bag) system. Refer to the Chassis Electrical Section.
   
4. Remove the air bag module from the steering wheel.
   
5. Remove the steering wheel.
   

Remove the upper and lower steering wheel trim covers using the following procedure.

• Remove the tilt lever assembly.
  
• Remove the two pan head tapping screws from the lower shroud.
  
• Unlock the upper and lower shroud.
  
• Remove the two Torx® head screws from the upper shroud.
  
• Remove the upper shroud.
  

Remove the wire harness straps from the wire harness assembly and detach the wiring harness connectors from the switch side connectors.

Remove the two multifunction turn signal switch screws and remove the multifunction switch assembly from the vehicle.

To install:

1. Install the multifunction switch to the steering column. Use a small flat-blade prytool to compress the electrical contact and move the multifunction turn signal switch into position. Verify that the electrical contact rests on the canceling cam. Install the screws and tighten to 62 inch lbs. (7 Nm).
   
2. Route the wire harness along the steering column jacket assembly and secure into the wire harness strap. Install a new wire tie to the upper tilt head assembly and another lower along the wiring harness, as the original installation.
   
3. Verify that the lever is in the center of the OFF position.
   
4. Install the upper and lower steering column shrouds.
   
5. Route the SIR connector through the steering wheel, align the scribe mark on the steering wheel made at removal, with the slash mark on the steering shaft and install the steering wheel. Install the steering shaft nut and torque to 30 ft. lbs. (41 Nm).
   
6. Install the horn contact leads and the air bag connector to the back of the air bag. Make sure the CPA wedge is in place to secure the connector. Install the air bag by gently pushing on both the right and left sides of the air bag until the retaining springs engage.
   
7. Enable the SIR system by connecting the yellow 2-way connector at the base of the steering column and installing the air bag fuse.
   
8. Connect the negative battery cable. Test the horn, turn signals and headlight operation.
   

Removal & Installataion

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 (air bag) system. Refer to the Chassis Electrical Section.
   
4. Remove the air bag module from the steering wheel.
   
5. Remove the steering wheel.
   

Exploded view of the shroud-type steering column showing shrouds, wiring and multifunction switch that includes the headlamp function

1. Remove the upper and lower steering wheel trim covers using the following procedure.
2. Remove the tilt lever assembly.
   

• Remove the two pan head tapping screws from the lower shroud.
  
• Unlock the upper and lower shroud.
  
• Remove the two Torx® head screws from the upper shroud.
  
• Remove the upper shroud.
  

1. Remove the wire harness straps from the wire harness assembly and detach the wiring harness connectors from the switch side connectors.
   
2. Remove the two multifunction turn signal switch screws and remove the multifunction switch assembly from the vehicle.
   

To install:

1. Install the multifunction switch to the steering column. Use a small flat-blade prytool to compress the electrical contact and move the multifunction turn signal switch into position. Verify that the electrical contact rests on the canceling cam. Install the screws and tighten to 62 inch lbs. (7 Nm).
   
2. Route the wire harness along the steering column jacket assembly and secure into the wire harness strap. Install a new wire tie to the upper tilt head assembly and another lower along the wiring harness, as the original installation.
   
3. Verify that the lever is in the center of the OFF position.
   
4. Install the upper and lower steering column shrouds.
   
5. Route the SIR connector through the steering wheel, align the scribe mark on the steering wheel made at removal, with the slash mark on the steering shaft and install the steering wheel. Install the steering shaft nut and torque to 30 ft. lbs. (41 Nm).
   
6. Install the horn contact leads and the air bag connector to the back of the air bag. Make sure the CPA wedge is in place to secure the connector. Install the air bag by gently pushing on both the right and left sides of the air bag until the retaining springs engage.
   
7. Enable the SIR system by connecting the yellow 2-way connector at the base of the steering column and installing the air bag fuse.
   
8. Connect the negative battery cable. Test the horn, turn signals and headlight operation.
   

1. Disable the SIR system.
   
2. Remove the upper and lower trim covers.
   
3. Remove the knee bolster.
   NOTE The abrasion sleeve located on the steering column wire harness assembly must be reinstalled. Make note of what connector is coming out of the abrasion sleeve for installation purposes.
   
   
4. Remove the wire harness assembly from the wire harness strap.
   
5. Disconnect the turn signal and multifunction switch assembly connector from the SIR system coil connector.
   
6. Slide the 2 connectors of the turn signal and multifunction switch assembly out of the bulkhead connector.
   
7. Remove the 2 pan head tapping screws and from the turn signal and multifunction switch assembly.
   
8. Remove the turn signal and multifunction switch assembly from the steering column tilt head assembly.
   

To install:
NOTE 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.

CAUTION Be sure that the electrical contact of the turn signal and multifunction switch assembly (2) rests on the turn signal cancel cam assembly.

CAUTION The abrasion sleeve must be installed back onto the steering column wire harness assembly. The ignition lock cylinder case wires and connector must be hanging out of the middle of the abrasion sleeve.

1. To install, reverse removal procedure.
   
2. Tighten the following to specification.
   
   • Top pan head tapping screw: 27 inch lbs. (3 Nm).
     
   • Side pan head tapping screw: 62 inch lbs. (7 Nm).
     

CAUTION When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Refer to SIR Disabling and Enabling . Failure to observe the correct procedure could cause deployment of the SIR components, personal injury, or unnecessary SIR system repairs.

Multi-function Switch Removal & Installation To Remove:
To Remove:

1. Remove the steering column trim covers.
2. Remove the wire harness from the retainers as needed.
3. Slide the turn signal and multifunction switch connectors out from the bulk head connector.
4. Remove the two mounting screws and remove the multi-function switch from the steering column.

To Install:

1. Install the multi-function switch on the steering column.
   • Tighten the screws to 42 lb in (4.7 Nm).
2. Slide the turn signal and multifunction switch connectors into the bulkhead connector.
3. Install the harness in the original retainers.
4. Install the steering column trim covers.

Removing the turn signal mechanism from the steering column is easy and can be accomplished in under a half hour. First you should remove one of the battery cables as you should have no power available when removing or installing the wiring harness.then remove the front of the steering wheel.These usually just snap on or off. Remoce the steering wheel using a small puller once you have removed the nut. . Usually available for aroung $10. Now that the signal mechanism is exposed you can wemove the plastic horn ring and also the 3 screws securing the mechanism to the steering column. Leave the mechanism on the colum for now. You can however reomove the screw that holds the lights, wiper and turn signal arm and let it hang free as there is no need to replace it if everything is working. Next you have to remove the two panesl under the dash immediately under the steering column. Tracing the wiring from the turn signal to where it enters a wiring block. This block has all the wiring from the turn signal, lights , cruise control and turn signals all on different modules. You are only concerned with the module from your tirn signals. To remove this module you have to separate the block by using a small ratchet and a 7mm socket. once the the bolt holdingb the block has been completely loosened the inner block can be oulled away from the outer block. Now the module containg the turn signal harness can be removed from the inner blosk and now you are close to removing the harness but first there is a plastic sleeve that protest the wiring as it passes along the lower part of the colimn. Squeezing one end of the sleeve you can push it out until it clears the colum. it can now be opened and reomoved from the harness. Now you can reomve the mechanism from the column and ease the harness up throught the steering solumn being careful to guide it through. The last two wires on the module , a beize and green wire that ties internally to the column will need to be cut and spliced into the new harness. Using the reverse proceedure you can install the new turn signal. First time may take a hour or so . One gets better with practice. Good luck John