This procedure covers the removal and replacement of the dimmer switch (multifunction lever) on the steering column of a 2023 Chevrolet Bolt EUV electric vehicle.

Warnings

Tools required

Parts

• Dimmer switch (multifunction lever assembly) × 1 — GM 84632351 or equivalent
• Steering column trim clips (if damaged) × 4 — Use OEM specification

Preparation

1. Park vehicle on level surface and ensure the transmission is in Park
2. Turn off the vehicle completely and remove the key fob from the interior
3. Turn the steering wheel to the straight-ahead position
4. Open the hood and locate the 12V battery in the front left corner of the engine bay
5. Disconnect the negative (-) terminal from the 12V battery and isolate the cable
6. Wait at least 2 minutes for airbag system capacitors to discharge
7. Adjust the steering column to its lowest tilt and shortest telescoping position for easier access

Procedure

1. 1

   Remove lower steering column trim panel
   Locate the lower steering column cover beneath the steering wheel. Remove the two T20 Torx screws at the bottom of the lower cover. Gently pull the lower cover downward and away from the column, releasing the retaining clips. Set the cover aside.
2. 2

   Remove upper steering column trim panel
   Locate the upper steering column cover. Remove the two T20 Torx screws securing the upper cover. Carefully lift the upper cover upward, being mindful of the ignition lock cylinder if equipped. Separate the cover from the column and set aside.
3. 3

   Locate and access dimmer switch connector
   With both column covers removed, identify the dimmer switch (multifunction lever) on the left side of the steering column. Locate the electrical connector attached to the base of the switch assembly where it mounts to the column housing. You should see a gray or black connector with a locking tab.
4. 4

   Disconnect electrical connector
   Press the locking tab on the electrical connector and carefully pull the connector away from the dimmer switch. If the connector is tight, use a small flathead screwdriver to gently release the tab while pulling. Do not force the connector as the terminals are fragile.
5. 5

   Remove dimmer switch mounting screws
   Locate the two T15 or T20 Torx screws securing the dimmer switch assembly to the steering column housing. These screws are typically located on the left side of the column housing. Remove both screws completely and retain them if reusing.
   Torque spec

   Connector Screws4 Nm (3 lb-ft)
6. 6

   Remove dimmer switch assembly
   Gently pull the dimmer switch assembly away from the steering column housing. The switch may have a small tab or alignment pin that needs to be disengaged. Carefully work the assembly free without forcing it. Inspect the mounting area for any debris or damage.
7. 7

   Install new dimmer switch assembly
   Position the new dimmer switch assembly to the steering column housing, aligning any tabs or pins with their corresponding slots. Ensure the switch is fully seated against the column housing before proceeding. The lever should move freely through all positions.
8. 8

   Install mounting screws
   Insert and hand-tighten the two mounting screws through the dimmer switch into the steering column housing. Once both screws are started, torque them to specification using a torque wrench. Ensure the switch assembly does not shift during tightening.
   Torque spec

   Connector Screws4 Nm (3 lb-ft)
9. 9

   Reconnect electrical connector
   Align the electrical connector with the dimmer switch terminals and push firmly until you hear or feel a positive click. Verify the locking tab is fully engaged. Gently tug on the connector to confirm it is secure.
10. 10

    Reinstall upper steering column cover
    Position the upper steering column cover over the column, ensuring all clips align with their receptacles. Press firmly to engage the clips. Install the two T20 Torx screws and torque to specification.
    Torque spec

    Cover Screws11 Nm (8 lb-ft)
11. 11

    Reinstall lower steering column cover
    Position the lower steering column cover beneath the column, aligning all retaining clips. Press upward firmly until all clips engage. Install the two T20 Torx screws and torque to specification.
    Torque spec

    Cover Screws11 Nm (8 lb-ft)
12. 12

    Reconnect battery and initialize systems
    Reconnect the negative terminal to the 12V battery and torque to specification. Do not overtighten as the terminals are soft lead. Close the hood and prepare for system verification.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all steering column trim panels are properly clipped and secured before operating the vehicle
2. Verify no tools or parts remain in the steering column area
3. Confirm the steering column can be adjusted through its full range of tilt and telescoping positions without interference

Verification

• Turn the vehicle to the ON position without starting (press brake and push start button twice without foot on brake)
• Test the turn signal function by moving the dimmer switch lever up (right turn) and down (left turn), confirming dash indicators illuminate
• Test the high beam function by pulling the lever toward you momentarily (flash-to-pass) and pushing away from you to lock in high beams
• Test the windshield wiper function by rotating the wiper control ring through all positions: off, intermittent, low, and high speed
• Test the windshield washer by pulling the lever toward you and holding, confirming washer spray and wiper activation
• Verify the hazard light function still operates correctly using the hazard button on the center console
• Drive the vehicle in a safe area and confirm all turn signal and lighting functions work properly under actual driving conditions
• Ensure no warning lights remain illuminated on the instrument cluster related to lighting or signal systems

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