2000 Cavalier Z24 remote door lock problem

[tbill]

haha, glad i helped out, in a round about way

[ago]

tbill,

I've been super busy in the last few days. I'll do these tests in the next couple of days or so, and report back here.

You are great. Thanks for the info...

more later...

ago

[ago]

Originally Posted by tbill

ok, i think we can skip the schematic and i can tell you what circuit in which connector to check. at the bcm, you should be able to 'back probe' the terminal with your meter.

first test, back probe terminal A3 [wire should be white in color]in bcm connector C1 [purple in color, 16 cavities], other lead to ground, press unlock switch on door, should get battery voltage [this is unlock input to bcm from door lock switches]. if this isn't battery voltage or near it, you have a wire issue.

if ok, the next wire to back probe will be in the same connector, but terminal A6 [wire should be tan in color], press either door unlock switch, or remote unlock switch, voltage should be battery or near it, if ok, it's a wire issue, if not ok, bcm is faulty. [this is 'unlock' voltage to the drivers door power door lock actuator]

trunk release, back probe same bcm connector at terminal A5 [black/white wire], press trunk release, should have battery voltage or near it [bcm sends batt. V directly down this circuit to trunk solenoid], if no voltage, bcm is faulty, if ok, wire issue between bcm and release solenoid.

i think this should get you situated. i should be around tomorrow, so i'll check in every now and again to see how you make out, hope this helps,

tbill

Hi again tbill,

Sorry about not getting back to you sooner. I've been so busy.

Anyways I did the above diagnostics, and it turns out that the BCM is the culprit.

Thanks for your detailed info.

Now the search for a good deal on a replacement BCM.

Any ideas ??

Thanks so much,

ago

[ago]

Hi tbill,

Now that I have a new BCM (actually a used one from a used parts dealer), I need to find out how to program it for my car.

When I install it (disconnect 12V at fuse box first to avoid power spikes), I cannot start the car (fuel gets shut off) and the radio showes "Locked" on the radio display.

My car has the Passlock key theft deterrent system, where if a non-authorised or other car key inserted, the fuel is cut-off and the car will not start.

I tried to "relearn" the key with the new BCM installed, by turning the key to the "ON" position (not "START") and leaving it ON for 10 minutes. The security icon flashes for awhile, then goes steady, then goes out. Then I turn off the key for 10 seconds then turn over to start and still no luck in starting the engine. Tried this 2 or 3 times (10 minute wait while in "ON", then 10 sec. "OFF" then "START"). No luck.

I also tried to resynchronise the remote, by pressing and holding "LOCK" and "UNLOCK" for several seconds. The response should be a unlock/lock cycling of the door locks. No luck there too.

Re-installing the original (but faulty) BCM allows me once again to start the engine, get my previous partial door locking condition, and also clears the "LOCKED" car radio that I got with the new BCM.

I am not 100% sure of my programming steps. What am I doing wrong ?

Thanks,

ago

[tbill]

hi, to be honest, it's been awhile since i put a bcm in one of those. i'll have to look up the procedure in our service info on how to program it monday. i honestly can't remember if it is a plug and play with a key relearn, or if it is an actual 'scanner/PC re-program'. i'll post what i find for you monday evening when i get home from work.

[ago]

Hi tbill,

Thanks for the quick reply. It may require a "Tech II", or just a scan for codes first, but I also heard that it just requires a key relearn (3 times the 10 minute ON, and on the last cycle go straight afterwards to start". Then resync the key remotes...standing by for your info on Monday.

Thanks again bigtime !

ago

[tbill]

hey, looked it up today, and it does need to be programmed with a tech 2, then most likely it will need the key fobs programmed and the theft deterrent [pass lock] will need to be learned as well.

hope this helps,

tbill

[Foxtrap]

I just wanted to say I am having the exact same problem with my 2000 Cavalier Z24 remote. Could you please tell me what was the solution?

[Geomatics]

I have a 2000 Sunfire, the Drivers door will not lock with the key, the manual lock button, the automatic lock button, or the keyless entry fob. I had the door apart, and I have good power goin to the unit. The door linckages all seem fine but still won't lock. seems like it is seized. My question is, how do I fix this?, could I just take out the electric lock module ( this is where i think the problem is, or is there an easier solution?

Thanks
Geo

[tbill]

geo, sounds like the door latch itself is seized. might get it working again if you spray the daylights out of it repeatedly with penetrating oil.

[Geomatics]

Originally Posted by tbill

geo, sounds like the door latch itself is seized. might get it working again if you spray the daylights out of it repeatedly with penetrating oil.

Thanks, I guess that's what I'll have to try until I get the time to tear the door down and get a good look at what is going on in there(or not going on).

Thanks
Geo.

[ago]

tbill,

Hi again. Finally brought the car to the dealer (for Tech 2 reprogram). Turns out it was just the "RFA" fuse. The BCM wasn't at fault all along. $30 later for a fuse change (I felt so silly), I was on my way. I should have checked all the fuses in the fuse panel on the left side.

Now I have a spare BCM to sell...oh well...

Thanks again,

ago

[Foxtrap]

Originally Posted by ago

tbill,

Hi again. Finally brought the car to the dealer (for Tech 2 reprogram). Turns out it was just the "RFA" fuse. The BCM wasn't at fault all along. $30 later for a fuse change (I felt so silly), I was on my way. I should have checked all the fuses in the fuse panel on the left side.

Now I have a spare BCM to sell...oh well...

Thanks again,

ago

Thank you so much Ago for telling how you resolved the problem. I really appreciate you helping others such as myself. Thank you again.

[timmer24can]

Wow I just went down and check that fuse after reading this thread>>>>>>and bam everything works now. Cheers