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Remove knee bolster.
Disconnect battery.
Turn key to "ON" position. Leave in ON position until new switch is inserted.
Push square button in center of ignition switch electrical connector, which allows latch to be slid and connector to be disengaged from switch.
Push in on 2 plastic retainer pins which hold switch in to housing, slide switch out of lock housing.
Slide new switch in to housing, helping retainer pins to lock if neccesary (sometimes they click right in to place).
Reattach connector.
Done, well, except to test then reinstall bolster.
That pretty much covers it, the bolster R&R is the hardest part of the job (129s are easier in this regard than 140s), although first timers may get hung up on pushing in the retaining pins.
The real trick to keep in mind is to keep the switch in the ON position, it needs to be there to remove the connector, to remove the switch, to reinstall the switch, and to install the connector. Compared to previous switch and lock systems MB used, this is ridiculously easy.
Gilly
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