Genuine Mercedes-Benz 300TD Ignition Switch

Mercedes-Benz 300TD Ignition Switch Parts and Q&A

• Ignition Switch
  123-462-01-79
  Q: What steps should be taken if the ignition switch steering lock is defective and cannot be operated on Mercedes-Benz 300TD?

  A:

  If the steering lock is defective and cannot be operated, the complete column must be removed, and the locking pin drilled out. Begin by disconnecting the negative cable at the battery and placing it out of the way to prevent accidental contact with the negative terminal. Next, remove both under dash panels and the instrument cluster. Bend back the tabs to remove the key lock trim ring from the dash. For early models, use a hooked piece of wire to pull the plastic cap from the lock. Unplug the connector from the ignition switch after removing the instrument cluster. For later models, insert the ignition key and turn it to the I position, then use a piece of 0.05 in (1.25 mm) diameter wire in the locking cylinder cut-out to unscrew the cap and remove the locking cylinder. After removing the wire and turning the key to the O position, reinstall the locking cylinder while pushing down the detent and disconnect the contact plug. On all models with a steering lock starter switch, mark and disconnect the vacuum lines from the vacuum valve. Loosen the steering lock clamp bolt, depress the locking pin with a small screwdriver while the ignition key is in the I position, turn the lock slightly, then turn the key to the O position and remove it. Withdraw the steering lock from the column, and with the key in the I position, remove the contact switch or locking cylinder. Installation is the reverse of removal, ensuring to securely reconnect the vacuum lines to their original positions and, for models without a steering lock starter switch, attach the preglow cable control to the steering lock while adhering to specified dimensions.