Ignition Lock Cylinder

This procedure covers removal and replacement of the ignition lock cylinder on the 2007-2013 Mercedes-Benz S65 AMG, including steering column access and Electronic Ignition Switch (EIS) module considerations.

Warnings

Tools required

Parts

• Ignition lock cylinder assembly × 1 — Use OEM specification - A2215450008 or equivalent
• Lock cylinder retaining clip × 1 — Often included with cylinder assembly
• Steering column trim clips (assorted) × 5 — Have spares on hand

Preparation

1. Park vehicle on level ground with front wheels pointed straight ahead
2. Engage parking brake and ensure transmission is in Park
3. Turn ignition to OFF position and remove SmartKey from vehicle
4. Disconnect negative battery terminal and wait 10 minutes for airbag system to discharge
5. Disconnect positive battery terminal to prevent accidental power-up during procedure
6. Cover fenders with protective blankets to prevent scratches during work

Procedure

1. 1

   Remove lower steering column covers
   Remove the lower dash panel below the steering column by pulling down firmly at the edges to release clips. Remove the lower steering column cover by removing T20 Torx screws (typically 4 screws). Carefully separate the lower cover from upper cover, being mindful of any wiring harness clips attached to the cover.
2. 2

   Remove upper steering column cover
   With lower cover removed, locate and remove T20 Torx screws securing the upper steering column cover (typically 3-4 screws). Gently lift the upper cover away from the column, disconnecting any wiring clips for steering column switches if necessary. Set covers aside in a clean area.
3. 3

   Access the ignition lock cylinder housing
   Locate the ignition lock cylinder housing on the right side of the steering column. The cylinder is integrated with the EIS module on this vehicle. Remove the protective cover over the lock cylinder assembly by removing two T25 Torx screws. Note the orientation of all connectors and wiring for reassembly.
   Torque spec

   Cover Screws15 Nm (11 lb-ft)
4. 4

   Disconnect EIS module electrical connector
   Locate the main electrical connector on the EIS module. Press the release tab and carefully pull the connector straight out from the module. On some models, there may be a secondary connector for the lock cylinder position sensor - disconnect this as well. Note connector orientation and any securing clips.
5. 5

   Release lock cylinder retention mechanism
   Insert the emergency key blade into the ignition lock cylinder. Turn the key to position 1 (ACC). Locate the small release hole on the side of the cylinder housing (typically accessed from below or side). Insert a small flathead screwdriver or pick into the release hole and press the internal release tab while gently pulling on the key and cylinder assembly.
   ⚠The cylinder must be in position 1 (ACC) for the release mechanism to function. Do not force if cylinder does not release - verify key position.
6. 6

   Remove ignition lock cylinder
   While maintaining pressure on the release tab, pull the lock cylinder straight out of the housing. Remove the retaining clip from the old cylinder if it did not stay in the housing. Inspect the cylinder bore in the housing for any debris or damage. Clean with contact cleaner if necessary.
7. 7

   Prepare new lock cylinder for installation
   Remove the new lock cylinder from packaging. Insert the new key into the cylinder and turn to position 1 (ACC). If the retaining clip is separate, ensure it is properly positioned in the cylinder groove or housing as per manufacturer instructions. Verify the cylinder slides smoothly through all key positions before installation.
8. 8

   Install new ignition lock cylinder
   With the new key in position 1 (ACC), align the cylinder with the housing opening. Ensure any alignment tabs or guides are properly oriented. Push the cylinder straight into the housing until it seats fully and you hear/feel the retaining mechanism click into place. Turn the key through all positions to verify proper operation and that cylinder does not pull out.
9. 9

   Reconnect EIS module electrical connections
   Reconnect the main EIS module electrical connector, ensuring it clicks securely into place. Reconnect any secondary connectors for position sensors. Verify all connector locking tabs are fully engaged. Reinstall the protective cover over the lock cylinder assembly and secure with T25 Torx screws.
   Torque spec

   Cover Screws15 Nm (11 lb-ft)
10. 10

    Reinstall steering column covers
    Position the upper steering column cover over the column, reconnecting any switch wiring clips. Secure with T20 Torx screws to proper torque. Install the lower steering column cover, ensuring all alignment tabs engage properly. Secure with T20 Torx screws. Reinstall the lower dash panel by pressing firmly until all clips engage.
11. 11

    Reconnect battery and program EIS module
    Reconnect positive battery terminal first, then negative terminal. Connect Mercedes-Benz Star Diagnosis tool or compatible scan tool. Navigate to EIS module programming function. Follow on-screen prompts to register the new lock cylinder to the EIS module. This process typically requires entering vehicle VIN, old key data, and new key synchronization. Clear any fault codes generated during the procedure.
    ⚠️Programming must be completed successfully or vehicle will not start. Do not attempt to start vehicle until programming is confirmed complete and EIS module shows no faults.

Reassembly

1. Verify all steering column covers are properly secured and aligned
2. Check that all trim panels and dash components are reinstalled with clips fully engaged
3. Ensure no tools or parts were left in the steering column area
4. Verify battery terminals are tight and properly secured

Verification

• Turn ignition to all positions (OFF, ACC, ON) and verify smooth operation with no binding
• Verify EIS module recognizes the SmartKey and new lock cylinder with no warning lights
• Start the engine to confirm proper EIS module programming and ignition system function
• Check for any dashboard warning lights related to ignition, EIS, or steering column
• Use scan tool to verify no stored fault codes in EIS module or related systems
• Test emergency key blade function in new lock cylinder through all positions
• Verify steering column functions normally with no unusual noises or resistance

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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