Question about 2006 Chevrolet Cobalt

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My locks keep locking and unlocking while driving and my alarm goes off when opening the door and the car is unlocked. Someone told me the BCM??? I am a single mom... cant aford much

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Mine did the same thing. It was one of the door lock/unlock buttons. I took it out and cleaned it. All has been OK since

Posted on Feb 27, 2011

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Ask the dealership if there is an update for the BCM and how much it would cost to re-flash the programming for the BCM

Posted on Dec 17, 2009

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Alarm in my 2002 gmc Sonoma goes off when I open the door with the key. Lost remote. Can I disable the alarm without messing other things up?


Door Key Switch
The BCM monitors the door key switches in order to disarm the CTD system. When the lock cylinder turns in order to unlock the door, the switch grounds the disarm input to the BCM.
The key lock input to the BCM is probably missing , BCM doesn't see it . So it think's your breaking into the vehicle. Did you try the passenger door to see if it will disable the alarm .
The BCM - body control module ! Electronic -computer !
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Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

The factory service repair manual has a 23 step diagnostic procedure . An you would need a factory scan tool to find the correct fix.
Turn ON the ignition with the engine OFF.
With a scan tool, observe the door key switch parameter in the Body Control Module (BCM) security data list.
Does the scan tool display INACTIVE?

Locking the Vehicle Without Arming the System
Use one of the following procedures in order to lock the vehicle without arming the system:
• Procedure A -- Lock the vehicle using the manual door lock knobs. Close all the doors.
• Procedure B -- Close all the doors. Use the key or the power door lock switch in order to lock the door. The doors must be closed prior to locking the doors for this procedure.
Disarming the System
In the arm initiated mode, the following conditions are true:
• The security telltale is ON.
• The doors are open.
In order to disarm a system in the arm initiated mode, perform one of the following procedures:
• Press the power door lock switch to the UNLOCK position.
• Press the door unlock button on the key fob.
In order to disarm a system in the arm delay or the armed mode, perform one of the following procedures:
• Use the key in order to unlock one of the doors.
• Press the door unlock button on the key fob.
Deactivating the Alarm
In the alarm mode, the following conditions are true:
• The horns sound intermittently.
• The headlights and the park lamps are flashing.
In order to deactivate a system in the alarm mode, perform one of the following procedures:
• Use the key in order to unlock one of the doors.
• Press the door unlock button on the key fob.
• If the vehicle control module (VCM)/powertrain control module (PCM) receives a valid Passlock™ ignition key rotation.

Nov 29, 2017 | GMC Sonoma Cars & Trucks

1 Answer

2002 yukon xl .My locks & alarm system dont work ! What do i do ? I checked fuses also


Power Door Locks Inoperative - All Doors and Switches ?
The MIR/LOCK fuse supplies battery positive voltage for the power mirrors, power door lock switches and the memory seat switch (if equipped). If the MIR/LOCK fuse is open, all systems on the fuse would be inoperative. The fault could be a short to ground in the battery positive voltage circuit, however, a short to ground in the power mirror motor control or the memory seat control circuits could also be the cause if the fuse opens after any of the switches are activated. If a short to ground exists in either the door lock or unlock relay control circuits, a DTC (B3137 or B3147) would set when the BCM commands a lock or unlock function.
Did you perform the Power Door System Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Door Systems

2

Actuate all door lock switches to both the lock and unlock positions.
Did all the doors lock and unlock?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3

3

Did any of the doors lock and unlock from any of the switches?
Go to Power Door Locks Inoperative - One Door or Switch
Go to Step 4

4

  1. Install a scan tool.
  2. With the scan tool, command the doors to lock and unlock.
Did the doors lock and unlock?
Go to Step 12
Go to Step 5

5

  1. Remove the door lock relay.
  2. With a test lamp connected to a good ground, test the battery positive voltage circuits for the door lock relay at the fuse block.
Did the test lamp illuminate?
Go to Step 6
Go to Step 13
The Content Theft Deterrent function provides the theft deterrent by sounding the horn and flashing the headlamps and the park lamps when there is an unauthorized vehicle entry or there is tampering detected.
SECURITY Telltale The SECURITY telltale on the instrument cluster is controlled by both the VTD system and the CTD system.
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The VTD system commands the instrument cluster to control the telltale only when the ignition switch is ON. The VTD system uses the telltale as a malfunction indicator. If a DTC is present in the VTD system when the ignition is ON, the telltale will be illuminated.


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The CTD system commands the instrument cluster to control the telltale only when the ignition switch is OFF. The CTD system uses the telltale to identify system status.


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Telltale FLASHING -- The system is in standby mode. The system is not ready to arm (a door is open).


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Telltale ON STEADY -- The system is in delay mode. The system is ready to arm and is executing a time delay of 15 seconds before turning the lamp OFF and transitioning to armed mode.


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Telltale OFF -- The system may or may not be armed.
Body Control Module (BCM) The body control module (BCM) monitors several inputs in order to arm and disarm the CTD system. The BCM controls the alarm function outputs. When the BCM detects an unauthorized entry (any door opened), the BCM applies ground to the horn, the park lamp and the headlamp relays. The BCM will send messages to the security telltale in the instrument cluster through the Class 2 serial data link. The BCM has the following 8 basic modes for operating the CTD system. The more detailed descriptions are below.
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Off state


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Idle state


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Disarmed state


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Ready-to-arm state


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Arm initiated state


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Arm delay state


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Armed state


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Alarm state

The BCM has the following 6 discrete inputs in order to monitor the CTD system:
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Ignition 1


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Driver door latch (door jamb) switch


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Passenger door latch (door jamb) switch


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Door lock relay


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Door key switch


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Passenger door unlock relay

The BCM applies ground once per second for approximately 2 minutes, or until a valid input to disarm the system is received by the BCM.
Check the door lock relay !

Jun 16, 2016 | Cars & Trucks

1 Answer

07grandprix my door locks are all actin up sometimes they work & sometimes they dont I can set the alarm even tho they wont lock & the alarm goes off if u open the door but won't lock with the key/pad


The Power Door Lock System is controlled by the body control module (BCM) and can be activated by any one of the following
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A door lock switch lock or unlock actuation.


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A door lock cylinder switch unlock actuation.


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A keyless entry transmitter actuation.


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An automatic door lock actuation (Personalization function).


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An automatic door unlock actuation (Personalization function).


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A last door closed locking (LDCL) actuation (Personalization function).


Door Lock Operation
When the body control module (BCM) detects a transition of either of the door lock switches to the lock position, it switches the door lock actuator lock control circuit to voltage. Since the lock actuator unlock control circuits are at ground potential within the BCM, the door lock actuator motors transition to the lock position.
Driver Door Unlock Operation
When the body control module (BCM) detects a transition of either of the door lock switches to the unlock position, it switches the driver door lock actuator unlock control circuit to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the left front (LF) door lock actuator motor transitions to the Unlock position.
The driver door lock actuator unlock control circuit is a dedicated control circuit used only for the driver door lock actuator motor. This is done so that the driver door may be unlocked by itself using a keyless entry transmitter or an automatic door unlock function (if programmed).
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections.
A factory scan tool would help for checking inputs from the door switches to the BCM ! You could do it with out scan tool , a lot more work involved ! Need a wiring diagram an a component location chart an wiring harness routing diagram !
Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items:
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Wiring broken inside the insulation


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Poor connection between the male and female terminal at a connector


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Poor terminal to wire connection--Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc.


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Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.


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Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring or parts of the vehicle.


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Wiring that comes in contact with hot or exhaust components


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Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required, in order to verify the customer concern.


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Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage conditions.


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Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis and Vehicle Data Recorder operation.


You should take it to a ASE certified repair shop if not familiar with Automotive electronics !

Jul 14, 2015 | Cars & Trucks

1 Answer

2005 Chevy Impala. The door locks keep locking during drive.


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 B3127
DTC B3128, B3133, or B3138
DTC B3132
DTC B3137
DTC B3272
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

Jul 21, 2017 | Cars & Trucks

1 Answer

Alarm keeps going, car locked or unlocked


Hopely this trick is useful.

1. Open the window.
2. Disconnect the battery.
3. Close the door. (Keep the window open)
4. Turn the ignition key on.
5. Find the hood sensor in engine bay area. (It looks like push button)
6. Press the hood sensor and reconnect the battery. (Keep pressing the sensor)
7. Ask someone to start the engine (Keep pressing the sensor)
8. After the engine start, you can release that sensor.
9. Now your alarm vehicle was deactivated.

This trick is effective for common mitsubishi car which not using immobilizer.

Mar 08, 2015 | 2006 Mitsubishi Grandis 2.0

1 Answer

Antitheft system keep goes on I can't start vehicle


Use the remote to deactivate alarm or use key in the door lock to unlock the door. The problem you had is when you lock the door and the alarm activates it must see a disarm signal or else it thinks someone broke the window and used the switch to open the door.

Aug 06, 2014 | 1998 Nissan Pathfinder

1 Answer

Panic switch


The alarm is armed if keyfob is used. So you must use the fob to disarm alarm first. So someone can not unlock and open door without keyfob or alarm will be set off.

Jan 29, 2018 | Cars & Trucks

1 Answer

On my 2004 dodge stratus the door lock switch on the drivers side does not unlock the doors. It will lock all of the doors and the windows but it just will not unlock. The passenger side still works for...


I have answered this subject many times: it is a bad BCM or Body Control Module. The problem begins intermittently, but progresses during two to three years and finally inutilizes all door locks. As BCM repair and removal from the dash is a real pain, I resorted to disconnect the wiring to the BCM and paid a much lower price to a Car Alarm installer to put an inexpensive alarm that comes with its own remote. In that way I use the new remote to lock-unlock and the original one to set the original alarm-inmobilizer. Amclaussen.

Aug 02, 2013 | 2004 Dodge Stratus

1 Answer

Have a 1998 dodge minivan,PCM,was replaced. now door locks and rear window wiper comes on by itself while driving or parked. gas gauge will get stuck on empty line off and on. we were told can be BCM, is...


If it has something to do with the BCM , there would probably have DTC'S - diagnostic trouble codes stored , An just replace a BCM would cause more problems , same with PCM's ! These modules need to be configured and programmed . Also ,without testing no one could say for sure that the BCM is bad . That would be a guess ! Door locks locking an unlocking could be a bad switch input to the BCM . Watch this video plus part 2 and 3
Door Locks Go Crazy 1

May 04, 2017 | 1998 Dodge Caravan

1 Answer

Alarm keeps going off


you need to insert the key into the drivers door lock it then unlock it

if that don't work, do the same with the passanger door
\
which means the switch to the drivers door is bad

Jan 27, 2009 | 1991 Mercedes-Benz 190

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