pressing unlock causes one door to unlock and the other to lock

[polpower]

I have a 2001 Chevy Silverado 2500HD extended cab. When using the key FOB, the drivers door unlocks with one press of the unlock button. When I press it again, the passenger door unlocks but it causes the drivers door to lock again. When using the unlock button inside on the door the same thing occurs. Sometimes I have to push the button 5-10 times to get the passenger door to unlock. If I continue to push unlock it will lock the door again. What is happening?!!!!!!!!! Wondering if it could be the BCM?

[tooch420]

That's weird...I would think wires are crossed somewhere.

[gmtech4]

there is more to the system than a BCM,do not guess at anything ,,here is a little info for giggles

 

 

Keyless Entry System Description and Operation

The Keyless Entry System is a supplementary vehicle entry device. Use the
Keyless Entry System in conjunction with a door lock key. Radio frequencies or
discharged batteries may disable the system.

Keyless entry allows you to operate the following components:

• The door locks, including the rear compartment.
• 
  
• The illuminated entry lamps
• 
  
• The panic alarm

The Keyless Entry System has the following main components:

• The transmitters
• 
  
• The remote control door lock receiver (RCDLR)

The RCDLR communicates with the body control module (BCM) through the keyless
entry serial data circuit. When you press a button on a transmitter, the
transmitter sends a signal to the RCDLR. The RCDLR sends a request to the BCM
and the BCM performs the appropriate function.

Unlock Drivers Door Only

Momentarily press the UNLOCK button in order to perform the following
functions:

• Unlock the driver door only.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Unlock All Doors-Second
Operation

Momentarily press the UNLOCK button a second time within 2 seconds of the
first press in order to perform the following functions:

• Unlock the remaining doors.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Lock All Doors

Press the LOCK button in order to perform the following functions:

• Lock all of the doors.
• 
  
• Immediately turn off the interior lamps.
• 
  
• Chirp the horn, if the LOCK button is pressed a second time within
  5 seconds.

Rear Compartment Lid
Release

Press the Rear Release button once in order to perform the following
functions:

• Unlock the rear compartment.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.

Alarm

A single press of the panic button performs the following functions:

• Illuminates the interior lamps
• 
  
• Pulses the horn
• 
  
• Flashes the headlamps
• 
  
• Flash the park lamps

The panic alarm continues for a predetermined amount of time or until either
of the following occur:

• The panic button is pressed again.
• 
  
• The ignition switch is turned to RUN with a valid key.

Keyless Transmitter Low Battery
Warning

The Drivers Message Center will display a warning light if the Keyless
Transmitter battery becomes low. Refer to Transmitter
Battery Replacement for battery replacement procedures.

Rolling Code

The Keyless Entry System uses rolling code technology. Rolling code
technology prevents anyone from recording the message sent from the transmitter
and using the message in order to gain entry to the vehicle. The term “rolling
code” refers to the way that the Keyless Entry System sends and receives the
signals. The transmitter sends the signal in a different order each time. The
transmitter and the RCDLR are synchronized to the appropriate order. If a
programmed transmitter sends a signal that is not in the order that the RCDLR
expects, then the transmitter is out of synchronization. This occurs after
256 presses of any transmitter button when it is out of range of the

there is more to the system than a BCM,do not guess at anything ,,here is a little info for giggles

 

 

Keyless Entry System Description and Operation

The Keyless Entry System is a supplementary vehicle entry device. Use the
Keyless Entry System in conjunction with a door lock key. Radio frequencies or
discharged batteries may disable the system.

Keyless entry allows you to operate the following components:

• The door locks, including the rear compartment.
• 
  
• The illuminated entry lamps
• 
  
• The panic alarm

The Keyless Entry System has the following main components:

• The transmitters
• 
  
• The remote control door lock receiver (RCDLR)

The RCDLR communicates with the body control module (BCM) through the keyless
entry serial data circuit. When you press a button on a transmitter, the
transmitter sends a signal to the RCDLR. The RCDLR sends a request to the BCM
and the BCM performs the appropriate function.

Unlock Drivers Door Only

Momentarily press the UNLOCK button in order to perform the following
functions:

• Unlock the driver door only.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Unlock All Doors-Second
Operation

Momentarily press the UNLOCK button a second time within 2 seconds of the
first press in order to perform the following functions:

• Unlock the remaining doors.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Lock All Doors

Press the LOCK button in order to perform the following functions:

• Lock all of the doors.
• 
  
• Immediately turn off the interior lamps.
• 
  
• Chirp the horn, if the LOCK button is pressed a second time within
  5 seconds.

Rear Compartment Lid
Release

Press the Rear Release button once in order to perform the following
functions:

• Unlock the rear compartment.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.

Alarm

A single press of the panic button performs the following functions:

• Illuminates the interior lamps
• 
  
• Pulses the horn
• 
  
• Flashes the headlamps
• 
  
• Flash the park lamps

The panic alarm continues for a predetermined amount of time or until either
of the following occur:

• The panic button is pressed again.
• 
  
• The ignition switch is turned to RUN with a valid key.

Keyless Transmitter Low Battery
Warning

The Drivers Message Center will display a warning light if the Keyless
Transmitter battery becomes low. Refer to Transmitter
Battery Replacement for battery replacement procedures.

Rolling Code

The Keyless Entry System uses rolling code technology. Rolling code
technology prevents anyone from recording the message sent from the transmitter
and using the message in order to gain entry to the vehicle. The term “rolling
code” refers to the way that the Keyless Entry System sends and receives the
signals. The transmitter sends the signal in a different order each time. The
transmitter and the RCDLR are synchronized to the appropriate order. If a
programmed transmitter sends a signal that is not in the order that the RCDLR
expects, then the transmitter is out of synchronization. This occurs after
256 presses of any transmitter button when it is out of range of the

there is more to the system than a BCM,do not guess at anything ,,here is a little info for giggles

 

 

Keyless Entry System Description and Operation

The Keyless Entry System is a supplementary vehicle entry device. Use the
Keyless Entry System in conjunction with a door lock key. Radio frequencies or
discharged batteries may disable the system.

Keyless entry allows you to operate the following components:

• The door locks, including the rear compartment.
• 
  
• The illuminated entry lamps
• 
  
• The panic alarm

The Keyless Entry System has the following main components:

• The transmitters
• 
  
• The remote control door lock receiver (RCDLR)

The RCDLR communicates with the body control module (BCM) through the keyless
entry serial data circuit. When you press a button on a transmitter, the
transmitter sends a signal to the RCDLR. The RCDLR sends a request to the BCM
and the BCM performs the appropriate function.

Unlock Drivers Door Only

Momentarily press the UNLOCK button in order to perform the following
functions:

• Unlock the driver door only.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Unlock All Doors-Second
Operation

Momentarily press the UNLOCK button a second time within 2 seconds of the
first press in order to perform the following functions:

• Unlock the remaining doors.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Lock All Doors

Press the LOCK button in order to perform the following functions:

• Lock all of the doors.
• 
  
• Immediately turn off the interior lamps.
• 
  
• Chirp the horn, if the LOCK button is pressed a second time within
  5 seconds.

Rear Compartment Lid
Release

Press the Rear Release button once in order to perform the following
functions:

• Unlock the rear compartment.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.

Alarm

A single press of the panic button performs the following functions:

• Illuminates the interior lamps
• 
  
• Pulses the horn
• 
  
• Flashes the headlamps
• 
  
• Flash the park lamps

The panic alarm continues for a predetermined amount of time or until either
of the following occur:

• The panic button is pressed again.
• 
  
• The ignition switch is turned to RUN with a valid key.

Keyless Transmitter Low Battery
Warning

The Drivers Message Center will display a warning light if the Keyless
Transmitter battery becomes low. Refer to Transmitter
Battery Replacement for battery replacement procedures.

Rolling Code

The Keyless Entry System uses rolling code technology. Rolling code
technology prevents anyone from recording the message sent from the transmitter
and using the message in order to gain entry to the vehicle. The term “rolling
code” refers to the way that the Keyless Entry System sends and receives the
signals. The transmitter sends the signal in a different order each time. The
transmitter and the RCDLR are synchronized to the appropriate order. If a
programmed transmitter sends a signal that is not in the order that the RCDLR
expects, then the transmitter is out of synchronization. This occurs after
256 presses of any transmitter button when it is out of range of the

there is more to the system than a BCM,do not guess at anything ,,here is a little info for giggles

 

 

Keyless Entry System Description and Operation

The Keyless Entry System is a supplementary vehicle entry device. Use the
Keyless Entry System in conjunction with a door lock key. Radio frequencies or
discharged batteries may disable the system.

Keyless entry allows you to operate the following components:

• The door locks, including the rear compartment.
• 
  
• The illuminated entry lamps
• 
  
• The panic alarm

The Keyless Entry System has the following main components:

• The transmitters
• 
  
• The remote control door lock receiver (RCDLR)

The RCDLR communicates with the body control module (BCM) through the keyless
entry serial data circuit. When you press a button on a transmitter, the
transmitter sends a signal to the RCDLR. The RCDLR sends a request to the BCM
and the BCM performs the appropriate function.

Unlock Drivers Door Only

Momentarily press the UNLOCK button in order to perform the following
functions:

• Unlock the driver door only.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Unlock All Doors-Second
Operation

Momentarily press the UNLOCK button a second time within 2 seconds of the
first press in order to perform the following functions:

• Unlock the remaining doors.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.
• 
  
• Flash the park lamps.

Lock All Doors

Press the LOCK button in order to perform the following functions:

• Lock all of the doors.
• 
  
• Immediately turn off the interior lamps.
• 
  
• Chirp the horn, if the LOCK button is pressed a second time within
  5 seconds.

Rear Compartment Lid
Release

Press the Rear Release button once in order to perform the following
functions:

• Unlock the rear compartment.
• 
  
• Illuminate the interior lamps for a predetermined amount of time or until
  the ignition is turned ON.

Alarm

A single press of the panic button performs the following functions:

• Illuminates the interior lamps
• 
  
• Pulses the horn
• 
  
• Flashes the headlamps
• 
  
• Flash the park lamps

The panic alarm continues for a predetermined amount of time or until either
of the following occur:

• The panic button is pressed again.
• 
  
• The ignition switch is turned to RUN with a valid key.

Keyless Transmitter Low Battery
Warning

The Drivers Message Center will display a warning light if the Keyless
Transmitter battery becomes low. Refer to Transmitter
Battery Replacement for battery replacement procedures.

Rolling Code

The Keyless Entry System uses rolling code technology. Rolling code
technology prevents anyone from recording the message sent from the transmitter
and using the message in order to gain entry to the vehicle. The term “rolling
code” refers to the way that the Keyless Entry System sends and receives the
signals. The transmitter sends the signal in a different order each time. The
transmitter and the RCDLR are synchronized to the appropriate order. If a
programmed transmitter sends a signal that is not in the order that the RCDLR
expects, then the transmitter is out of synchronization. This occurs after
256 presses of any transmitter button when it is out of range of the

[gmtech4]

you might want to have the truck BCM scanned

[ujtruck]

"here is a little info for giggles"

 

thanks RoB good info

[gmtech4]

it was a big post after i posted it !!!! lol

 

welcome