Question about 1999 Chevrolet Astro

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1999 astro van door lock actuator wont work

The actuator has 12 volts to both sides of the connector {depending on direction desired} and the actuator responds but does not have sufficient power to push and pull the lock rod. The lock rod is not binding or pinched and has the same resistance as the one on the opposite door. And, there is a brand new GM actuator just installed so I am sure the problem is not in the actuator itself. The circuit tests properly for power supply and ground when tested at all points in the manual and the control relay and board test ok too.................any Ideas ?? This one has me TOTALLY confused.

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Even though it is new there is always a chance the actuator may not be good; I had the same symptoms with 3 of my actuators and had to replace them all about 3 years ago.

Posted on May 10, 2009

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Try running a wire to jump the 12 volt power to it, this sounds like high resistance in the power side of the wiring, or even a higher resistance in the grounding. this is a strange problem.

have you replaced the lock switch?

Posted on Mar 21, 2009

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Mode Valve Actuator Replacement - Left Side Removal Procedure
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The doors lock automatically on my daughter's '99 Cougar. This has happened to me when I left the keys in the ignition and closed the driver's door. After AAA came and unlocked the doors, I removed the...


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Principles of Operations
The Door Switch Lock Function When a door lock switch is moved into the lock position or a door lock cylinder is rotated to the lock position, the door lock switch grounds the lock circuit input to the central security module (CSM). The CSM then provides 12 volts to one side of the door lock actuators contained in the door latch unit and simultaneously grounds the other side of the door lock actuators. This completes the door lock actuator circuit, causing the door lock actuators to rotate a cam assembly, which then locks the doors. The 12 volts that the CSM provides to the door lock actuators are provided to both door lock actuators from a single pin on the CSM electrical connector.
The Door Switch Unlock Function When a door lock switch is moved into the unlock position, the door lock switch grounds the unlock circuit input to the CSM. The CSM then provides 12 volts to the opposite side (relative to locking the door) of the door lock actuator(s) contained in the door latch unit and simultaneously grounds the other side of the door lock actuator(s). This completes the door lock actuator circuit, causing the door lock actuator(s) to rotate a cam assembly in the opposite direction, which the unlocks the door(s). The 12 volts which the CSM provides to the door lock actuator(s) are provided to each door lock actuator from the individual pins on the CSM electrical connector.
--------------------------------------------------------
CSM Self-Test The CSM has a self-test which can be entered into by using a diagnostic tool. This self-test will monitor the following CSM door lock inputs:
  • Unlock switch (DTC B1311)
  • Lock switch (DTC B1300)
  • Exterior lock switch (DTC B1309)
  • Exterior unlock switch (DTC B1341)
Before running the self-test, the following conditions must be met:
  • The ignition switch must be in position II
  • The driver and passenger doors must be unlocked
  • The driver and passenger doors must be opened
  • The hood and liftgate must be closed
  • The set/reset switch, and liftgate release switch are not actuated
It is important to note that all of the diagnostic trouble codes (DTCs), with the exception of B1551 and B1553 can be retrieved with the self-test. DTCs B1551, and B1553 are continuous and will only be retrieved if the liftgate release is operated prior to retrieving the continuous DTCs.
Inspection and Verification
  1. NOTE: Make sure that the battery is fully charged before starting electrical diagnosis.
    NOTE: Prior to carrying out the CSM Self-Test, make sure that both the driver and passenger doors are open.
    Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical and electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Binding latch mechanisms
  • Binding linkage
  • Misaligned door
  • Central junction box (CJB) fuse(s)
  • Wiring harness
  • Electrical connector(s)
  • Door lock switch(es)
  • Door lock actuator(s)


Module Controlled Functions
The central security module (CSM) covers the following functions:
  • Central door locking
  • Double door locking
  • Anti - theft alarm incorporating
    • forced entry
    • radio theft
  • Radio frequency remote control of
    • central door locking
    • panic alarm
    • driver door unlock
    • liftgate unlock
For additional information, refer to Section 419-01A Anti - Theft - Active, Section 501-14A Handles, Locks, Latches and Mechanisms, and Section 501-14B Keyless Entry/Computer Operated Locks.

The CSM is in the passenger side kick panel I think.

Good luck

Jan 25, 2011 | 1999 Mercury Cougar

1 Answer

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Visual Inspection Chart Mechanical Electrical
  • Binding latches
  • Door lock cylinder
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  • Lock actuator
  • Fuse
  • Relays
  • Switch
  • Wiring harness
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Symptom Chart Condition Possible Sources Action
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PINPOINT TEST A: THE DOOR LOCK IS INOPERATIVE CONDITIONS DETAILS/RESULTS/ACTIONS A1 CHECK THE OPERATION OF THE SUSPECT DOOR LOCK sxn~us~en~file=box1.gif~gen~ref.gifCheck for binding or stuck conditions by manually operating the inoperative door lock.
  • Is the lock stuck or binding?
sxn~us~en~file=arrow.gif~gen~ref.gifYes REPAIR or REPLACE the binding components. TEST the system for normal operation.
sxn~us~en~file=arrow.gif~gen~ref.gifNo GO to A2 . A2 CHECK THE POWER DOOR LOCK ACTUATOR FOR LOCK OPERATION — CIRCUIT 117 (PK/BK) sxn~us~en~file=box1.gif~gen~ref.gif
sxn~us~en~file=ic0004.gif~gen~ref.gif Inoperative Power Door Lock Actuator
sxn~us~en~file=box2.gif~gen~ref.gif
sxn~us~en~file=gn0085a.gif~gen~ref.gif sxn~us~en~file=box2.gif~gen~ref.gifMeasure the voltage at the inoperative power door lock actuator connector Pin 1, Circuit 117 (PK/BK), and ground while operating the door lock switch to the LOCK position.
  • Is the voltage greater than 10 volts?
sxn~us~en~file=arrow.gif~gen~ref.gifYes GO to A3 .
sxn~us~en~file=arrow.gif~gen~ref.gifNo REPAIR Circuit 117 (PK/BK). TEST the system for normal operation. A3 CHECK THE POWER DOOR LOCK ACTUATOR FOR UNLOCK OPERATION — CIRCUIT 118 (PK/O)/163 (R/O) sxn~us~en~file=box1.gif~gen~ref.gif
sxn~us~en~file=gn0086a.gif~gen~ref.gif sxn~us~en~file=box1.gif~gen~ref.gifMeasure the voltage at the inoperative power door lock actuator connector Pin 2, Circuit 118 (PK/O) or 163 R/O, and ground while operating the door lock switch to the UNLOCK position.
  • Is the voltage greater than 10 volts?
sxn~us~en~file=arrow.gif~gen~ref.gifYes INSTALL a new power door lock actuator. TEST the system for normal operation.
sxn~us~en~file=arrow.gif~gen~ref.gifNo REPAIR Circuit 118 (PK/O) and/or 163 (R/O). TEST the system for normal operation.

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1 Answer

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