Mercury YS4Z-11572-AC Switch Assembly - Ignition

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The ignition switch is located below the steering column behind the knee bolster and must be removed for checking. Using an ohmmeter or self-powered test light along with the provided diagrams, check for continuity between the indicated switch terminals in each of the specified positions. If continuity is not as required, the switch should be replaced. To replace the switch, first disconnect the negative battery cable followed by the positive battery cable and wait two minutes. Turn the ignition key lock cylinder to the Run position, then remove the center trim panel for 2002 and earlier models along with the driver side knee bolster. Unplug the ignition switch electrical connector and remove the retaining screws; on some later models, a tab retains the switch, which must be depressed to remove it. Disengage the ignition switch from the actuator pin and take it out of the vehicle. Ensure the actuator pin slot in the new ignition switch is in the Run position, as a new replacement switch will be set in this position. Position the new switch on the actuator pin and install the retaining screws, adjusting the switch as necessary to align the screw holes. Finally, the installation process is the reverse of removal, and proper operation of the ignition switch should be checked in the lock, start, and accessory positions.

Installation is the reverse of removal.

Insert the ignition key, turn it to the accessory position, and use a small screwdriver or twist drill through the hole in the side of the lock housing to depress the locking plunger and withdraw the lock barrel.

Disconnect the cable from the negative terminal of the battery.

Remove the lower steering column cover.