QuestionHow do you do the bypass at the BCM as stated in a pervious qustion you answered? We are having the same issue off and on.
The disarm function is usually accomplished via unlocking a door (either one, try both doors). Do a lock/then unlock. If that doesn't work, then once the battery is fully charged, try removing fuse #5 under the dash for about a half hour, then reinstall and try to start it. If no go, then try both door lock/unlock. Then if that all doesn't work we can try doing the lock/unlock at the body control module, just in case the wires from the doors are severed by fatigue. There is no easy way to disconnect the alarm, it is wired into the body control module. We have to get around it.
AnswerHi Michael,
There is a 20-pin black plug at the body control module which has 4 pins that carry wires that come from the left and right door locks, 2 wires from each. You need to buy a couple of low wattage resistors from an electronics store, 620 ohms and 2700 ohms or as close as you can get to those two resistances. Then with two jumper wires you would use one to jump from the 12V supply at fuse #5 to the light green/orange wire at pin 19, and the other jump from the white/dark green wire at pin 8 to one end of the 2700 ohm resistor and then take the other end of the 2700 ohm resistor and touch it to the same 12v supply at fuse #5 momentarily and then remove it. That simulates unlocking the left front door. If you use the 620 ohm resistor instead you would be simulating the locking of the door. You may not need to use that one at all if the use of the 2700 ohm resistor disarms the system, but just in case it doesn't you could simulate arming and then dis-arming. If the alarm LED on the dash goes off you have successfully disarmed the system. To simulate removal of the key from the lock, simply disconnect the 5v jump to pin 19. At that point it should be possible to start the engine and not have it die.
The right hand door lock is similarly jumped if trying the left pins doesn't work. The right door pins are dark green/orange on pin 20 (for the 12v jump) and white/light green on pin 18 for the resistor jump.
You will want to either use straight pins to penetrate the insulation of the wires, or trim a small amount of insulation from the wire itself to attach the jumper clip to the wire.
The body control module and under dash fuse box are connected together under the dash on the left side. If you can find the 20-pin black plug and the wires without removing it, do so, otherwise remove the screws that hold the package to the dash for better access.
Please let me know if this works out for you.
If you want to avoid this problem again, just avoid using the door key or the power door locks to secure the car. Rather use the mechanical push-buttons to lock the doors when you leave. There is no way I know of to disconnect the theft system, just either avoid it or fake it out as described above.
Roland
PS Thanks for the rating and nomination in advance.
