gmdlbp locking out radio

I have a 2003 Suburban that I recently installed an Avital 4103 remote start along with the XpressKit GM-DLBP. The problem I have is that it randomly locks out the radio on a daily basis. This requires me to remove the radio fuse and reinsert it to get the radio power again. The radio is an Alpine head unit with PAC RadioPro 4 interface, that I had no problem with before installing the remote start.

Where is your GMDLBP connected for data and where is the PAC RadioPro connected for data?

The GMDLBP data wire is connect at the back of the OBD II connection to the violet data wire. The PAC RadioPro is connected via adapter to the factory radio harness.

Ok what do you mean by locks out the radio? Does the radio not power up, power up but not respond, does the radio indicate it is "locked"?

You can try a different module than the GMDLBP. There might be incompatibility between the two aftermarket boxes. It's really hard to say when you don't have a specific pattern for failure (when this happens or is done it always messes up).

The radio does not have power unless I remove the fuse from the fuse block and reinsert it.

When you reinsert the fuse does it power up immediately upon insertion or does it power up when the key is turned to accessory?

Once on does the radio power off normally? If that's normal does it power back on normally? Just trying to find the pattern for failure/success. The BCM is responsible for sending the data message to turn on the radio once it sees the key turned on. The GMDLBP only has an interest in shutting down RAP after a remote start ends. The BCM has it's own ruleset for shutting down RAP.

I think I have found a pattern, let me give some detail.

1. Initially I powered the brown accessory 2 wire. My first trouble shoot was to disconnect it, the problem is the same.

2. When using the remote start the radio powers up prior to key insertion.

3. The following is the sequence that occurs when the radio loses power, requiring the fuse to be pulled and reinserted.

a. The door is locked using the remote.

b. After the lock cycles, a second lock cycle occurs and the horn honks. (this does not happen every time the remote is used).

c. Next vehicle start (with remote or key) no radio power.

Does it make a difference in where the GMDLP gets its power? Red vs RED / White wire at the ignition harness?

No, it doesn't matter (where it gets constant +12V).

I'm guessing the pink and pink/white are not connected/used on the gmdlbp. Which they shouldn't be.

Does the Suburban have a factory alarm? The lock/unlock wires from the avital where do they connect? Your occurrence with the lock cycle is odd, the locks should only cycle once.

Here is how I wired
Primary Harness
H/1 alarm disarm-      not used
H/2 alarm rearm-       not used
H/3 ignition to alarm- not used
H/4 activation input- not used
H/5 ground when locked-not used
H/6 horn output-       BCM gray plug pin B9
H/7 trunk release-     not used
H/8 ground- chassis
H/9 light flash-       BCM brown plug pin B2

Satelite 4 pin
1 negative status-     GMDLBP brown wire
2 negative accessory- Initially ran to relay to power
        2nd accessory (now disconnected)
3 neg starter out-     not used
4 neg ignition 2-      not used

Heavy 6 pin
1 ignition 1  pink at ignition harness
2 starter  yellow at ignition harness
3 accessory orange at ignition harness
4 12v + red at ignition harness
5 ignition 2  white at ignition harness
6 12v+ RED / white at ignition harness

Door lock
1 neg unlock  GMDLBP blue wire
2 empty
3 neg lock GMDLBP green wire

Remote Start 5 pin
H2/1 neutral safety    Chassis ground through toggle switch
H2/2 tachometer        white wire behind cluster
H2/3 brake shutdown    white wire above brake
H2/4 Hood pin hood pin
H2/5 status 2 not used

GMDLBP
brown   status at satellite harness
green   green at lock harness
blue    blue at lock harness
violet/white  not used
violet data wire at obd 2
pink/white not used
pink    not used
orange not used
red     red at ignition harness
black   chassis ground

I'm guessing there is a factory alarm, when sitting inside key out of ignition, use remote to lock the horn sounds repeatedly when opening the door. Should I use the factory disarm wire from the avital unit? If so where does it connect? and is it positive or negative?

Following avital options programed.

Horn honk pulsesoff
Ignition controlled lock       off
Ignition controlled unlock     off
Lock pulse duration 0.8 seconds
Unlock output   1 pulse
Lock output     1 pulse
Factory alarm disarm  with unlock
(should this be changed? or does it matter without wire connected)
Factory alarm disarm  1 pulse
Comfort closure off
Panic  off

Engine Check    Tach mode
Run Time        25 minutes
Parking lights constant
Crank time      0.6 sec
Activation pulse2
2nd ignition    ignition
accessory during wait to start   off
2nd status      normal
antigrind       on
wait to start   off
run time(timer) 1 minute

Avital H1/1 Light GREEN/ Black - Violet/White GMDLBP

That would be factory/OEM alarm disarm but should be unnecessary as the unlock accomplishes the same task.

Your wiring looks good.

You have the GMDLBP set to vehicle platform type 4? With that you can try a different module or wire the lock wire in direct
https://www.the12volt.com/installbay/downloads.asp?srch=all&term=techtips+1601

With that last point I'm assuming your troubles are being induced by the lock signal going over the data line. It'd be nice to test your issues against a factory radio to know if the vehicle end is working as designed or if the BCM is asleep at the wheel and not waking up the radio as it should.

Thanks I'll give it a try. Yes I do have gmdlbp in platform 4. Unfortunately I never had a factory radio, and the factory remote key fob never worked.

Connected GREEN/ black at the RS to the violet/white at the GMDLBP, also reprogrammed RS to turn off factory security prior to unlock. Still having random radio failure to power on. Going to turn off RS for a day to ensure it isn't a problem with the radio interface. If that doesn't work I guess I will wire the radio direct to a constant and ignition source.

I have had no problem with the remote start off. When I turned the R/S back on problem started again. I am leaning towards the battery rundown protection system shedding power to the radio. Any suggestions on how to bypass?

You could have a few issues.The Brown accessory wire in the truck should be powered and make sure that it loses power during crank. The GMDLBP went through many updates to resolve many little quirky issues like this and you may have an older firmware version. I gave up using PAC's new radio replacement modules. They had a lot of problems when they released them. I went back to their OS4 units for GM vehicles. One of the things you can do to help pin point the problem is to remote start the truck while sitting in it. If the radio doesn't work, check all other accessories like power windows and wipers. The fact that you are having issues with the alarm on the truck, I would suggest that it is time to update the GMDLBP with a new module.

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sparky

I think it is the gmdlbp. I have had no problem with the PAC interface, and it worked flawless with the r/s grounded off. I just checked and I have constant 12v at the radio, the BCM is just not waking up the radio intermittent when the remote start is turned on (not grounded out). Functions such as memory seat and mirrors work, so I don't think it is the complete BCM asleep. Intermittent problems just irk me.

That you pull the RADIO fuse to reset the radio indicates to me that it is the PAC that is "locking out". When you disable the RS, you are also disabling the GMDLBP.

I'm only guessing here, but I feel the crux of your problem is that the GMDLBP sends an unlock pulse, starts the car, the BCM car settings are set for "lock with ign" and the BCM sends another lock pulse that the PAC interprets as a door opened and shuts off its power to radio. Or something like that.

If your pulling the RADIO fuse, you're resetting the PAC. Something is "upsetting" the PAC. I think it's lock pulses being interpreted as RAP messages.

You may have to download the PAC software to change the car settings in the BCM that are set using the stock radio. I would start by changing any car settings that lock the doors with ignition on/off to OFF.

That's quite a theory there, only thing about it that doesn't sound feasible is the "lock w/ ign off"...In general any lock action that takes place with ignition turning off would be unlocking, whether it be a factory feature or part of the aftermarket module.

To test that theory of being a RAP shutdown command, one should be able to turn the car completely off, open the door, get in the car, and with the key start the vehicle and the radio should then come on. With this the BCM should have sent any RAP shutdown commands it feels it needs to (when the door opens) and by starting the ignition the BCM should send a fresh wake up command. Which should wake up the radio.

catback wrote:

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only thing about it that doesn't sound feasible is the "lock w/ ign off"...In general any lock action that takes place with ignition turning off would be unlocking,

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Good catch. That's what I meant. UNLOCK. And guess what an UNlock command does to RAP? That's right, CANCELS it.

Carry on.

The problem doesn't correlate with actual starting using the remote start. It seems to correlate with using the keyless entry function. Shouldn't the BCM reset with ignition key use? Is there a way to test if the BCM is sending a wake up data signal to the radio interface? This would allow me to determine if it is a incompatibility between the gmdlbp and PAC rp4-gm11 and which one to replace. I saw a suggestion in an earlier post to try a different bypass module, any suggestions?

davep. wrote:

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catback wrote:

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only thing about it that doesn't sound feasible is the "lock w/ ign off"...In general any lock action that takes place with ignition turning off would be unlocking,

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Good catch. That's what I meant. UNLOCK. And guess what an UNlock command does to RAP? That's right, CANCELS it.

Carry on.

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Whatcha talkin bout willis?

Define cancel

In my experience, lock and unlock has no bearing on RAP (Retained Accessory Power).

I switched out the Xpresskit GMDLBP for an idatalink ADS-DLSL GM1. The idatalink unit seems to have quicker response, and has eliminated the relock after using the key fob to lock, also the factory alarm comes on instantly. Unfortunately the random radio not coming on still exists. I trouble shot down to the following.

1. Only occurs with use of remote start key fob to perform any function, and is random.
2. Constant power remains at the radio and PAC RP4-GM11 module.
3. Unplugging the PAC module and plugging back in resolves issue.

So the PAC RP4-GM11 must not be compatible with the remote start or the bypass unit. I emailed PAC and their answer is that there are blown fuses, even after I explained all the fuses are okay. My temporary fix, until I can get a different interface, is a simple inline toggle switch in the constant wire feeding the RP4-GM11. I simply turn it off then on whenever this problem occurs.