Problem started couple of weeks ago doors started locking and unlocking on their own unless i diconnect battery lead, after overnight re-connect and it stops for a while then just starts again lock unlock lock unlock until battery flat? its got to be electrical but where, what, why, is xr3i 1992 and has had bits added ie alarm immob stereo etc but this prob only started recently
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Re: door locks lock and unlock permanently
Had this before but with a variety of faults ..boy racer alarm .take it off and invest in a decent steering wheel cover/lock ,fault in lock itself on drivers side as its used the most till i done one with the passenger side lock ,now that throw me .try throwing the boy racer sunday driver alarm away
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It's probably a bad input to the BCM - body control module ! Have it checked for DTC'S - diagnostic trouble codes .
The automatic door lock function can only be enabled by the body control module (BCM) if the driver door open switch and door ajar switches are in the Closed state. For information on programming the automatic door locks, refer to Vehicle Personalization in Personalization.
DTC B3064 or B3069
DTC B3128, B3133, or B3138
Your best bet , take it to the chevy dealer . Unless you own a GM factory Tech 2 scan tool an have access to factory sevice repair info.
The outputs to the door lock actuators are controlled by the body control module (BCM). When the BCM receives a lock input from a door lock switch, or a keyless entry transmitter, it applies battery positive voltage to the door lock actuator lock control circuit, a ground to the door lock actuator unlock control, and the driver door lock actuator unlock control circuits. When the BCM receives an unlock input from a door lock switch, it applies battery positive voltage to the door lock actuator unlock control, the driver door lock actuator unlock control circuits, and a ground to the door lock actuator lock control circuit . When the BCM receives an single Unlock input from a keyless entry transmitter, it applies battery positive voltage to the driver door lock actuator unlock control circuit and a ground to the door lock actuator lock control circuit to unlock the driver door. A second Unlock input from the transmitter applies battery positive voltage to the door lock actuator unlock control circuit, and a ground to the door lock actuator lock control circuit to unlock the passenger doors.
This diagnostic procedure supports the following DTCs:
• DTC B3128 Left Front/Driver Door Unlock Circuit High
• DTC B3133 All Door Unlock Circuit High
• DTC B3138 All Door Lock Circuit High
if this is a factory lock security system you can contact dealer for instruction sheet to re-program your remote or have them do that for you if vehicle is under warranty. if not you can go online and find the procedure for your make,model and year of vehicle. sounds like the remote's battery is need of replacing or the remote needs to be re-programmed
Start by having your car checked for a Trouble Code. Many Auto Parts stores do it for free. It seems to be a security issue that keeps locking the door. It is a system which works separate from all the other systems in your car.
The problem is not the actuators, the fault lies in the central locking control unit under the dashboard, behind the glovebox, on the firewall. The CLCU is mounted with the connection terminals to the top resulting in condensation going onto the printed circuit board inside, if the damage started a while ago there is only 3 ways to go.
1. specialist firm to repair the CLCU.
3. (As I did) buy a cheap remote control receiver with keyfob/s. Cut all wires off the multiplug, there are four pairs, a permanent live and permanent earth. Test each wire to earth on the van to identify the permanent earth FIRST. Then test pairs of wires across 12v/Earth noting which pairs actuate which lock.Isolate in pairs noting which wire has to be live to lock, (Reversed it will unlock) wire each pair into the relay on the remote receiver using the relay to changeover the polarity to each pair You will then be able to Lock/Unlock all the doors, throw the old CLCU away and mount the RCReceiver eslewhere to keep it dry. each door individually. I bought a 2 way RCReceiver and can lock/Unlock front doors seperate the the rear ones which is of far more use! Any decent electrician will tell you how to wire the relays. Job Done..... (100% Sure)
possible latch became diconnected in door , do you hear lock activate when unlocking or locking door to see if motor is working ,did you try using manual lock button should move up and down,try this while using power locks ,it may be just stuck,