Astro Van M L4-151 2.5L (1985)
(c)
Before removing the circuit board from the package, ground the package to the vehicle chassis.
(d)
Technicians should periodically ground themselves during the replacement operation, always before touching the circuit board and always after
sliding on the seat, sitting from standing position, or walking.
NO OPERATION AT ONLY ONE DOOR
Failure of the power door lock system to operate at only one door indicates an open circuit in the wiring to the door lock motor, a defective door lock
motor, door lock linkage binding, or door lock linkage not connected.
1.
Remove the door trim panel operate the door lock switch, and observe the door lock motor and linkage. If the door lock motor will not operate in
either direction, disconnect the wiring harness from the motor and check for voltage at the wiring harness connector while operating the door lock
switch. No voltage indicates an open circuit in the wiring. Voltage at the connector indicates a defective door lock motor. The procedure for
replacing the door lock motor is covered in the Service Manual.
2.
If the problem appears to be caused by system binding, review the following system components, locate point of binding or excessive friction
and repair as necessary.
^
Door Lock Knob/Escutcheon Interference
^
Bell Crank and Remote Assemblies
^
Linkage Rods Unconnected
^
Linkage Rods Bent Or Deformed
^
Linkage Rod/Clip Incorrectly Installed
^
Linkage Rod Guide Friction
^
Latch Assembly Locking Effort
INCOMPLETE TRAVEL OF LOCK AT ONE OR MORE DOORS
This problem indicated binding or excessive friction in the door lock linkage. Review the components listed in Step 2, "No operation at only one
door", locate point of binding and repair as necessary.
