2001 Chevrolet Silverado, GMDLBP Bypass And 451M Module?

Thanks again for all your help. My last question is about the factory disarm (green wire). My R/S doesn't have a disarm/rearm wire (shocker). I know the truck has a factory alarm but I was not given the key fob when I bought the truck and the replacement I bought never worked. Can the factory alarm be bypassed for the aftermarket.Tory209

I'm not sure if disabling the Factory Alarm system is possible. Never tried. You might try a Silverado Forum for that aspect. A possible work around is never setting the Factory Alarm. Typically, the only way to turn on the Factory Alarm is with the Lock button on the Factory FOB or by locking the doors with the inside door Lock button on exit. If you only use the Aftermarket FOB's to Lock the doors, the Factory Alarm system will never be enabled. As far as disarm during an Unlock command you could buy some 1N4001 diodes and split the (-) Unlock signal wire, connecting it to both the 451M vehicle Unlock wire input and the vehicle Disarm wire. Info below : OEM Alarm Disarm    Light GREEN (-)    AT B.C.M. BELOW THE STEERING COLUMN The truck needs a (+) Unlock signal (from the 451M output) and a (-) Disarm signalSoldering is fun!

As soon as I hook my battery up the 451m starts making this loud buzzing sound.when I press the unlock or lock button on the door nothing happens. Same with the alarm FOB.Tory209

It would help to know the R/S wiring for the two lock relays. That's the Orange, White & Yellow wires for Lock and the Orange/Black, White/Black & Yellow/Black wires for Unlock.Soldering is fun!

Being as the offshore R/S unit has built in lock relays, the 451m is not necessary. While it could be used, it would be redundant. Omit the 451m if you are using it and follow the Fig.2 Positive Trigger Lock diagram. Connect the R/S White wire to Silverado Lt. Blue (+) BCM, brown plug, pin A4 Connect the White/Black wire to Silverado White (+) BCM, brown plug, pin A3Soldering is fun!

The locks worked fine after using the figure 2 diagram. When I remote start the truck it tries to crank but dies immediately. The dash lights will be on and the I see the bypass module light up. I wired the 2 relays according to your instructions. Is the bypass supposed to kick on before it tries to crank? Or could this be from the factory alarmTory209

To be more specific it seems like maybe the R/S IG2 is delayed. I hear the relays click on and the bypass light comes on about 7 seconds after it tries to startTory209

Typical proper R/S sequence will turn on GWR about 1 second before the R/S brings up the (+) IGN1 output. Then a slight delay before the Starter Output is turned ON to crank the engine. Your offshore unit (without a GWR output) is using the IGN output to turn on the bypass module, so no advanced bypass engagement. Is the Security Light ON during R/S attempt? Did the PASSLOCK-SL2 bypass module program correctly and give 3 Blinks?Soldering is fun!

To be more specific it seems like maybe the R/S IG2 is delayed It's possible with that R/S unit. Ideally, both IGN1 and IGN2 should have the exact same timing. You could try using IGN1 as the control input for the two relays. As a test, you could apply a jumper to Chassis Ground on the PASSLOCK-SL2 (-) While Running input just prior to a R/S attempt.Soldering is fun!