The remotes signal the BCM.
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.
Transmitter Programming
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.
With the driver door closed, hold down the power unlock button on the door panel.
Turn the ignition switch to the ON position.
Turn the ignition switch to the OFF position.
Turn the ignition switch to the ON position.
Turn the ignition switch to the OFF position.
Release the power unlock button on the door panel.
The remote control door lock receiver will respond in the following manner in order to indicate that the receiver is in the programming mode:
6.1. Locking the doors
6.2. Unlocking the doors
Important: All extra transmitters must be programmed at this time. When a new transmitter is programmed, it will deactivate the old transmitters.
Hold down the lock and unlock buttons on the transmitter until the remote control door lock receiver will respond in the following manner:
7.1. Locking the doors.
7.2. Unlocking the doors.
Repeat step 7 for each additional transmitter.
Turn the ignition switch to the ON position in order to exit the transmitter programming mode.
SOURCE: keyless remote wont work, vehicle completely shut down
Hi Russell,
Absolutely no power? No dome light? No head lights? Nothing?
When you step on the brake pedal, no brake lights?
If true, start at the source and pop the hood.
This is going to be a bit of back and forth dialogue. I'll ask some questions and you get me the answers. That way we can get to the root of the problem. To save time, I'll ask multiple questions at a time. Here goes.
Try getting a jump, when the cables are attached does anything light up?
Does it turn over and start?
Does it do anything?
Comment me back with your findings
Mike
SOURCE: No power to inside of the vehicle!
Check the body control module under the hood, should be on the drivers side fenderwell. Perform wiggle test to harness first, then remove module and reinstall. for proper contact. Check for power in and out, 12 volts.
SOURCE: GMC JIMMY NO START BUT GOT SPARK AND FUEL
try the oil pressure switch, that was a common problem on Gm trucks when I used to work on them, the oils switch was bad and woulden't allow it to start and the ones I worked on were on the back of the distributor.
SOURCE: remote car starter will not start car
It sounds to me like you're missing a wire. There should be a wire leading to this that sends power to the distributor. If you don't have power to the distributor it won't fire it will just continue to crank over.
SOURCE: Needing to know what a BCM(Body Control Module) does.
it control warning
door locks
lights
alarm
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