Cadillac Owners Forum banner

1 - 6 of 6 Posts

·
Registered
Joined
·
25 Posts
Discussion Starter #1
I recently completed my most ambitious electrical mod ever, wiring in an original factory Remote Keyless Entry module to my 94 Fleetwood (base). After wiring 17 separate connections, including several from the trunk to the dash... it actually works. Some factory features I skipped (gas tank lock, tamper switches), and the range leaves something to be desired, but overall I'm thrilled with the results.

One minor issue I have is with the autolock function, which locks all doors when the car is shifted out of park, and then unlocks them when put into park. Sometimes after I park and it unlocks the doors, I'll turn off the key and the module will relock the doors. It's as if the "Park" signal is cutting off before the ignition signal (IGN3, in the wiring). For a split second the module reads the situation as "Engine On, Out of Park" and acts accordingly. This happens maybe 30-40% of the time. It is much less likely to happen if I turn the key off quickly.

And while some wiring was done a little differently from factory for convenience, both of theses are pretty close to original. I spliced into the IGN3 wire near the CCM, while the PARK wire runs under the dash to the Park/Neutral and Backup Lamp Switch.

So I'm not sure what to do. Is this a common issue with these modules? I do have a spare RKE module I could try. Or it is perhaps some issue with my ignition? I welcome any theories, suggestions, or wild speculation.
 

·
Registered
Joined
·
25 Posts
Discussion Starter #3
Could it be that something needs to be wired thru the retained accessory power.
I don't think so, based on the service manual wiring diagrams.

The Park/Neutral Position and Backup Lamp Switch Assembly, which generates the "Park" voltage, is powered through the Turn Signal fuse, which is hot in Run, Bulb Test, or Start. The IGN3 voltage comes straight from the fuse of the same name, which is hot in Run only.

This makes it even stranger that Park appears to cut out first. You would think turning the key off slowly, so it pauses in the Bulb Test position, would ensure IGN3 cuts out before PARK. But the opposite seems to be the case.
 

·
Registered
Joined
·
66 Posts
On page 9K-2 Auto Lock Feature it explains it will re-lock if a door is opened then closed with the ignition on and shifted back out of park with the brake pedal pressed. Wondering if pressing the brake or not would have any effect on your problem.

In theory if the brake is not depressed even if the gear position input lost 12v+ it should not re-rock.

Also it explains you can disabled by pushing the remote unlock button and brake for 5 seconds. Or enabled by pushing the remote lock button and brake for 5 seconds. Wouldn't hurt to try to disable than re-enable.

You might try checking the the module terminals with test light / DVM to see is a change in voltage of which wire happens at the same time as re-lock. Is it loosing the IGN3, gear input, brake, etc at the same time as re-lock. Maybe go as far as trying to recreate it by disconnecting reconnecting the suspect wire. Because it should be more than 1 condition that cause re-locking. It should be brake, door open & closed, IGN on, & out of park.

The other thing I wonder is, are there many terminals on the trans switch. Could it be on the wrong terminal or a different switch used with that option. Hard to tell with the manual because of simplified drawings. Only showing the particular terminals of the switch used for that topic, not everything connected.
 

·
Registered
Joined
·
25 Posts
Discussion Starter #5
Wondering if pressing the brake or not would have any effect on your problem.

In theory if the brake is not depressed even if the gear position input lost 12v+ it should not re-rock.
Hmmm. Interesting. I tested this function when I first put it all together (the sequence of Car in gear -> brake -> door open -> door closed) exactly once, and it worked. I've never had occasion to use it "out in the wild" so to speak.

My malfunction is intermittent, but once it happens I can usually recreate it several times in a row turning the key on and off. I'm eagerly awaiting the next one to try it with and without the brake. Hasn't happened in the last 3 days. (Electrical issues are fun, aren't they?)

I guess my only concern is, won't pressing the brake while/after turning off the car also disable the alarm arming sequence?
 

·
Registered
Joined
·
25 Posts
Discussion Starter #6
Update:
I can confirm that pressing the brake while turning the car off overrides the error. Additionally, pressing the brake only cancels the alarm arming sequence if the door is open.

Thanks LV_Cady!
 
1 - 6 of 6 Posts
Top