Inertia Switch
In the event of an impact registering at greater than 14G the Inertia Switch goes open. This open removes the voltage from X254 pin 21 at the BC1 (J3 54-pin Natural connector). The trigger of the inertia switch causes the BC1 to unlock doors.
The inertia switch has been eliminated from vehicles produced 9/2002 and later. The function is now carried out by the MRS control unit.
NOTE:
On vehicles without the inertia switch (9/2002 production on), the only way to activate a crash signal is for the MRS 4 control unit to detect an impact.