This procedure replaces the dimmer switch assembly (multifunction turn signal lever) on the steering column of a 2014-2018 Chevrolet Silverado 1500.

Warnings

Tools required

Parts

• Dimmer switch assembly (multifunction lever) × 1 — ACDelco D6253G or OEM equivalent
• Wire harness connector (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition to OFF position and remove key
3. Allow vehicle to sit for at least 2 minutes to allow airbag system capacitors to discharge
4. Open hood and disconnect negative battery cable using 10mm wrench
5. Wait an additional 2 minutes after battery disconnect before proceeding with airbag system work
6. Adjust steering wheel to lowest and fully extended position for access

Procedure

1. 1

   Remove lower steering column trim covers
   Locate the two Torx T20 screws on the underside of the lower steering column cover. Remove both screws and carefully pull the lower cover away from the column. Disconnect the tilt lever if equipped by pulling straight out. Remove the upper column cover by releasing the clips at the rear and lifting up and forward.
2. 2

   Remove knee bolster panel
   Remove the two Torx T20 screws securing the driver's side knee bolster panel below the steering column. Carefully pull the panel down and away from the instrument panel. This provides better access to the column and prevents damage during switch removal.
3. 3

   Disconnect steering wheel control connectors
   Locate the electrical connectors on the left side of the steering column near the multifunction lever. Press the locking tab on each connector and carefully pull straight out to disconnect. There will be at least one large connector for the dimmer/turn signal switch. Take a photo of connector positions for reference during reassembly.
4. 4

   Remove wiper/washer switch connector
   On the right side of the steering column, locate and disconnect the wiper/washer switch connector using the same locking tab method. This connector may be secured with a small screw; if present, remove using Torx T15 driver.
   Torque spec

   Connector Screws5 Nm (4 lb-ft)
5. 5

   Remove dimmer switch retaining screws
   Locate the two Torx T20 screws securing the dimmer switch assembly to the left side of the steering column jacket. These screws are typically positioned at the top and bottom of the switch mounting bracket. Remove both screws completely and keep them in a safe location.
6. 6

   Remove dimmer switch assembly
   Carefully pull the dimmer switch assembly straight away from the steering column. The switch lever may need to be wiggled slightly to clear any internal detents. Guide the wiring harness through the column opening as you remove the switch. Do not force or twist the assembly as this may damage the clockspring.
7. 7

   Inspect mounting area and wiring
   With the old switch removed, inspect the steering column mounting surface for any damage or debris. Check the wiring harness for any chafing, cuts, or damage. Verify the clockspring connector is properly seated and not damaged. Clean any debris from the mounting area with a clean cloth.
8. 8

   Install new dimmer switch assembly
   Guide the new dimmer switch wiring harness through the column opening. Align the switch mounting holes with the threaded inserts in the steering column jacket. Push the switch assembly toward the column until it seats flush against the mounting surface. Ensure the lever operates through its full range without binding.
9. 9

   Install dimmer switch retaining screws
   Install the two Torx T20 screws through the switch mounting bracket into the steering column. Thread both screws by hand first to prevent cross-threading. Tighten screws evenly in a crossing pattern to ensure even seating of the switch assembly. Final tightening should be snug but do not over-torque as this may crack the plastic housing.
10. 10

    Reconnect all electrical connectors
    Reconnect the dimmer/turn signal switch connector on the left side of the column, pushing until the locking tab clicks into place. Reconnect the wiper/washer switch connector on the right side. If a connector screw was present, install and torque to specification. Gently tug on each connector to verify they are fully seated.
    Torque spec

    Connector Screws5 Nm (4 lb-ft)
11. 11

    Reinstall steering column covers
    Position the upper steering column cover over the column, aligning the clips at the rear. Press down firmly until all clips engage. Install the lower column cover, ensuring any wiring is properly routed and not pinched. Install the two Torx T20 screws on the underside of the lower cover and tighten securely. Reinstall the tilt lever if equipped.
12. 12

    Reinstall knee bolster panel
    Position the knee bolster panel below the steering column and press into place. Install the two Torx T20 screws and tighten securely. Ensure the panel is flush and all clips are properly engaged.
13. 13

    Reconnect battery and initialize systems
    Reconnect the negative battery cable to the battery terminal and torque to specification using a torque wrench. Do not overtighten as this can damage the battery post. Turn the ignition to ON position (engine off) and verify the instrument cluster illuminates properly.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all electrical connectors are fully seated with locking tabs engaged
2. Verify no wiring is pinched between column covers or panels
3. Check that all trim panels are flush and properly aligned before considering the job complete

Verification

• Turn ignition to ON position and verify instrument cluster warning lights function normally
• Test dimmer switch by cycling headlights between high and low beam positions multiple times
• Test turn signal lever in both left and right positions, verifying both indicator lights and exterior lamps function
• Test hazard light function by pressing the hazard button
• Test flash-to-pass function by pulling the lever toward you briefly
• Verify cruise control buttons operate correctly if equipped on the lever
• Check that wiper/washer controls function properly on the right stalk
• Reset power window auto-up/down functions if necessary by holding each window switch in the up position for 2 seconds after the window fully closes
• Test drive vehicle to verify all multifunction switch operations work correctly under normal driving conditions

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