Question about 2002 GMC Sierra 1500

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Remote entry system on 2002 GMC truck stopped functioning. remotes are transmitting, still problem. Any suggestions

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My first thought was batteries in the remotes. how do you know they are still transmitting? or if they are, if they have sufficient power to broadcast the signal that it can be picked up by the receiver? if you can access the bcm, i'd look for that data. once that is determined, then it's a matter of tracing backwards until the problem is found. personally, i prefer to start at the end (in this case the actuators in the doors) and work backwards. the most common problem in any electrical malfunction is loss of ground. power second, and failed hard parts third.

Posted on Jun 23, 2009

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Posted on Jan 02, 2017

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Keyless Entry System Circuit Description
The Power Door Locks/Remote Keyless Entry control system provides several functions. The driver operates the vehicle door locks and rear window release from outside the vehicle using a hand-held radio transmitter. The transmitter sends coded signals to the remote control door lock receiver. The remote control door lock receiver detects and decodes the signal from the transmitter. The remote control door lock receiver issues signals to the body control module (BCM) through a serial data link. The BCM actuates relays to lock and unlock the doors and liftgate. The BCM can also release the liftglass. The power door lock switches provide manual control of the door locks.


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Important: Different keyless entry systems are used on General Motors vehicles. The parts are not interchangeable even though the parts may appear to be similar. Observe the back of the transmitter in order to properly identify the system. On 1998 S/T pickups and utilities, use a transmitter identified with GM/UTA preceding the part number.
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Turn the ignition switch to the ON position.
Turn the ignition switch to the OFF position.
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6.2. Unlocking the doors
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Hold down the lock and unlock buttons on the transmitter until the remote control door lock receiver will respond in the following manner:
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Turn the ignition switch to the ON position in order to exit the transmitter programming mode.

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