How long does it take to install a BCM?

The total body control module repair will usually take between 60 and 90 minutes, influencing the entire body control module repair cost.

How can I program a new GM BCM?

1)I buy a new replacement bcm from my gm dealer, install it, start the truck and drive it to the dealer for programming. You could do this, you will have to program the security code first. Then drive it in to have the RPO’s programmed in the BCM.

How to have the RPO programmed in the BCM?

Then drive it in to have the RPO’s programmed in the BCM. 1 Turn ON the ignition, with the engine OFF. 2 Attempt to start the engine, then release the key to ON; the vehicle will not start. 3 Observe the SECURITY telltale; after approximately 10 minutes the telltale will turn OFF. 4 Turn OFF the ignition, and wait 5 seconds.

Can a truck start without a BCM module?

Again on an 07 this would be true but not on an 03. The truck will not start without the bcm because of the security but it does not send out the on signal for the other modules like a new one would. Believe me, I’ve been all over this truck checking things and testing. At this point my next step is to replace the bcm.

How does the BCM connect to the PCM?

It says the bcm is the Power Mode Master (PMM) and controls all other modules including the pcm (on my truck anyway). The wiring diagrams show there is no direct link between the pcm and the diagnostic link connector, it shows the pcm connects directly to the bcm which then connects to the dlc.

Can a body control module be rebuilt from a bad BCM?

Secondly, the body control module must be the exact same part number as the bad BCM you’re replacing. A rebuilt body control module will most likely include upgrades to prevent the types of failures that occur in the original design.

How does the BCM work in a starter motor?

The transponder ignition key communicates with the receiver which then communicates the key code to the BCM. The body control module passes the key code on to the PCM for confirmation. If the key code is correct, the PCM sends a verification signal back to the BCM and the BCM supplies power to the control coil on the starter motor relay.

How does the BCM communicate with the ECM?

In addition to receiving inputs from switches and commanding relay operation, the BCM can also communicate with the ECM or PCM. For example, in some vehicles the anti-theft system works partially through the BCM. The transponder ignition key communicates with the receiver which then communicates the key code to the BCM.

Can a BCM switch turn off the headlights?

If so, the BCM can turn off the headlights to save battery power. In more complicated and more recent designs, car makers run a single wire to the multi function switch to control headlights, high beams, parking lamps, turn signals and hazards. How can they accomplish all that with a single wire? Simple, the switch contains several resistors.