Turn Signal Switch

Replace the turn signal switch (multifunction switch) on the steering column of a 2023 Chevrolet Bolt EUV electric vehicle.

Warnings

Tools required

Parts

• Turn signal/multifunction switch assembly × 1 — GM Part 84703655 or equivalent
• Steering column cover clips (if damaged) × 4 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition to OFF position and remove key fob from vehicle interior
3. Allow at least 2 minutes after battery disconnection for airbag system capacitors to discharge
4. Ensure steering wheel is in straight-ahead position before beginning work
5. Set front wheels to straight-ahead position

Procedure

1. 1

   Disconnect 12V battery
   Open hood and locate 12V battery in engine compartment. Using 10mm socket, loosen and remove negative battery terminal bolt. Carefully lift negative cable away from battery post and secure away from terminal. Wait minimum 2 minutes before proceeding to allow airbag system to fully discharge.
   Torque spec

   Battery Terminal Bolts7 Nm (5 lb-ft)
2. 2

   Remove lower steering column cover
   From driver's seat position, locate the lower steering column cover beneath the steering wheel. Remove the retaining screws (typically 2-3 screws) using Torx driver. Gently pull lower cover down and away from column, disconnecting any retention clips. Set cover aside in safe location.
   Torque spec

   Steering Column Covers2 Nm (1.5 lb-ft)
3. 3

   Remove upper steering column cover
   With lower cover removed, locate upper steering column cover screws (typically 2 screws at rear of cover). Remove screws and carefully lift upper cover up and over steering wheel, being careful not to scratch wheel or dash. Note position of any clips or guides for reassembly.
   Torque spec

   Steering Column Covers2 Nm (1.5 lb-ft)
4. 4

   Label and document wiring connections
   Before disconnecting any wiring, use masking tape and marker to label each connector for the turn signal switch. Take a photo or make a diagram showing connector positions. This multifunction switch typically has 2-3 electrical connectors on the Bolt EUV.
5. 5

   Disconnect turn signal switch connectors
   Locate all electrical connectors attached to the turn signal/multifunction switch assembly. Press release tabs on each connector and carefully pull connectors straight away from switch. Do not pull on wires. Support connectors to prevent strain on wiring harness.
6. 6

   Remove switch mounting hardware
   Locate the switch mounting screws (typically 2-3 screws) securing the turn signal switch to the steering column housing. Using appropriate Torx driver, remove all mounting screws completely. Keep screws organized for reinstallation.
   ⚠Do not allow screws to fall into steering column mechanism. Use magnetic tray or careful hand placement to capture screws.
   Torque spec

   Switch Mounting Screws3 Nm (2 lb-ft)
7. 7

   Remove turn signal switch assembly
   With mounting screws removed and all connectors disconnected, carefully slide the turn signal switch assembly away from the steering column. The switch lever may need to be rotated to clear the column housing. Remove switch from vehicle and inspect mounting area for damage or debris.
8. 8

   Prepare new switch for installation
   Remove new turn signal switch from packaging. Compare new switch to old unit to verify correct part. Inspect new switch for any shipping damage. Position switch lever in neutral/center position before installation to ease installation process.
9. 9

   Install new turn signal switch
   Guide new switch assembly onto steering column, carefully routing wiring harness to avoid pinching. Align switch mounting holes with column housing holes. Insert mounting screws and hand-tighten initially to ensure proper alignment before final torque.
   Torque spec

   Switch Mounting Screws3 Nm (2 lb-ft)
10. 10

    Reconnect electrical connectors
    Using labels and documentation from removal, reconnect all electrical connectors to new switch assembly. Each connector should click firmly into place when properly seated. Gently tug each connector to verify secure connection. Ensure wiring is routed cleanly without interference with steering column movement.
11. 11

    Reinstall steering column covers
    Position upper steering column cover over column, ensuring all clips and guides engage properly. Install upper cover screws to specification. Position lower cover and engage all retention clips, then install lower cover screws to specification. Verify covers are secure and properly aligned.
    Torque spec

    Steering Column Covers2 Nm (1.5 lb-ft)
12. 12

    Reconnect battery
    Return to engine compartment. Position negative battery cable onto negative battery post. Install battery terminal bolt and tighten to specification using torque wrench. Ensure connection is clean and secure.
    ⚠Verify cable is on correct (negative) terminal. Overtightening can damage battery post; undertightening can cause poor connection and electrical issues.
    Torque spec

    Battery Terminal Bolts7 Nm (5 lb-ft)

Reassembly

1. All fasteners must be torqued to specifications using calibrated torque wrench
2. Verify steering column covers are properly seated with no gaps or misalignment
3. Ensure no wiring is pinched between covers or column components
4. Confirm steering wheel can rotate fully lock-to-lock without binding or interference

Verification

• Turn ignition to ON position (do not start vehicle initially) and verify no airbag warning lights remain illuminated after system initialization
• Test turn signal function in both left and right positions - signals should flash at normal rate
• Test hazard lights function with all four corners flashing synchronously
• Verify high beam, low beam, and flash-to-pass functions operate correctly
• Test windshield wiper switch at all speed settings if integrated into multifunction switch
• Verify cruise control functions if integrated into switch assembly
• Check that turn signal cancels automatically after completing turn
• Test all functions with vehicle running to confirm proper operation under load
• Verify no warning lights on instrument cluster related to lighting or switch functions

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