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PostPosted: Wed Mar 04, 2015 2:31 pm 
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Year and Trim: 2003 Bonneville SSEi.
i have a question regarding the computer on these vehicles. I am swapping out my engine from a donor vehicle and I left the air filter housong open and left the computer exposed. I need to know if it's water tight as it has been this way for about a week. It has rained, sleeted, freezing rain and snowed. I hope it's ok because I don't need another headache with this vehicle.

please let me know.


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PostPosted: Wed Mar 04, 2015 3:52 pm 
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They are sealed pretty good, there shouldn't be an issue. When you get back to it though just to make sure you can disconnect it and check for water inside the connectors.

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PostPosted: Thu Mar 05, 2015 2:14 am 
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Unless you had it disconnected, I wouldn't give it a second thought. My PCM was exposed to nastiness for a couple years when I had the intake installed but no lower splash shield. No issues here!

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PostPosted: Fri Mar 06, 2015 12:15 am 
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Year and Trim: 2003 Bonneville SSEi.
I haven't unplugged it since I've had the car


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PostPosted: Thu Mar 12, 2015 10:32 pm 
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Finished the work on car. Donor engine good. Trans shifts through all gears.


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PostPosted: Thu Mar 12, 2015 10:36 pm 
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Good to hear!

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PostPosted: Tue Aug 27, 2024 8:26 am 
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Since this is about the PCM.... i have an INTENSE racing PCM i got from the wrecking yard... but the VIN doesn't match..... will it still work? It came from a 2003 SSEi and the level of it is Standard.... I don't know anything about these flash things.... can someone help me out here please and let me know how this will perform in the vehicle?


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PostPosted: Tue Aug 27, 2024 8:31 am 
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If you do a 30 minute security relearn it will work.

As long as you have the standard supporting mods and you're certain it isn't a crazy tune, it should benefit you.

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PostPosted: Wed Aug 28, 2024 3:32 pm 
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harofreak00 wrote:
If you do a 30 minute security relearn it will work.

As long as you have the standard supporting mods and you're certain it isn't a crazy tune, it should benefit you.


How is the security relearn done?

FYI - Engine has those Yella 1.8 roller rocker arms and a 3.6 ZZP pulley


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PostPosted: Wed Aug 28, 2024 4:34 pm 
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Here are the instructions from the service manual:
1. Turn ON the ignition, with the engine OFF, using a master Pass-Key® III key (black).
2. Observe the security telltale. After approximately 10 minutes the telltale will turn off.
3. Turn OFF the ignition, and wait 5 seconds.
4. Repeat step 1-3 two more times, for a total of 3 cycles or 30 minutes.

Here are instructions written from someone who has done many relearns.
1. Insert black key into ignition and turn to ON. Start 10 minute timer.
2. Wait for the yellow SECURITY light to go out and then turn the key to OFF for 5 seconds.
3. Again, turn ignition to ON. Start 10 minute timer.
4. Wait for the yellow SECURITY light to go out and then turn the key to OFF for 5 seconds.
5. Again, turn ignition to ON. Start 10 minute timer.
6. Wait for the yellow SECURITY light to go out and then turn the key to OFF for 5 seconds.
7. Again, turn ignition to ON and the car should start.

A couple points to mention. Roll the window down and keep all the doors shut during the entire process. Reach through the window opening to turn the key. If you have one, hook up a battery charger and charge it while you do the relearn. With the key on, it can drain the battery. To keep the load off the battery turn off the radio, blower fan and the headlights. Rotate the DELAY knob to OFF every cycle to keep the lights off. Use a stopwatch or timer to keep track of the 10 minute intervals so you can stay on top of it.

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1997 Corvette | 57k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 110k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 270k | Official Bonneville Hauler


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PostPosted: Wed Aug 28, 2024 6:57 pm 
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harofreak00 wrote:
Here are the instructions from the service manual:
1. Turn ON the ignition, with the engine OFF, using a master Pass-Key® III key (black).
2. Observe the security telltale. After approximately 10 minutes the telltale will turn off.
3. Turn OFF the ignition, and wait 5 seconds.
4. Repeat step 1-3 two more times, for a total of 3 cycles or 30 minutes.

Here are instructions written from someone who has done many relearns.
1. Insert black key into ignition and turn to ON. Start 10 minute timer.
2. Wait for the yellow SECURITY light to go out and then turn the key to OFF for 5 seconds.
3. Again, turn ignition to ON. Start 10 minute timer.
4. Wait for the yellow SECURITY light to go out and then turn the key to OFF for 5 seconds.
5. Again, turn ignition to ON. Start 10 minute timer.
6. Wait for the yellow SECURITY light to go out and then turn the key to OFF for 5 seconds.
7. Again, turn ignition to ON and the car should start.

A couple points to mention. Roll the window down and keep all the doors shut during the entire process. Reach through the window opening to turn the key. If you have one, hook up a battery charger and charge it while you do the relearn. With the key on, it can drain the battery. To keep the load off the battery turn off the radio, blower fan and the headlights. Rotate the DELAY knob to OFF every cycle to keep the lights off. Use a stopwatch or timer to keep track of the 10 minute intervals so you can stay on top of it.


What's the master PASS key? is that the cars key to start the vehicle?

By the way.... I like the picture of your avatar. Is that your engine setup? If so, my friend that is receiving this PCM is looking to put headers on the engine

WHere might I find a good set?


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PostPosted: Thu Aug 29, 2024 8:19 am 
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Master PASS key is the black key, the valet key is gray. You can't use a valet key for programming.

That picture is about 15 years old from a car I had long ago.

Headers will be on ebay or ZZP.

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2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 57k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 110k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 270k | Official Bonneville Hauler


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PostPosted: Thu Aug 29, 2024 12:38 pm 
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harofreak00 wrote:
Master PASS key is the black key, the valet key is gray. You can't use a valet key for programming.

That picture is about 15 years old from a car I had long ago.

Headers will be on ebay or ZZP.


Ok…. My friend has the PCM in the car and the security light is solid and the car won’t start. He will do the relearning process and I will relay what happens


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PostPosted: Thu Aug 29, 2024 11:54 pm 
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Procedure worked. Thank you much


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