Spastic trunk open warnings

[Racerhoze]

So I have already redone my trunk wiring and am still getting machine gun seizure time trunk open warning messages. Sometimes the gong interrupts itself they are so frequent and ANNOYING.

Now, my cluster has some spaz issues that are probably bad capacitor related. I am pretty sure that is why it tells me my suspension is leveling sometimes as well.

I also WD-40'd the switch on the trunk to see if that would help.

Has anyone encountered this? Should I look more towards my cluster or the switch on the trunk?

[paperplane94]

I didnt even know it gave trunk open warnings... something new every day.

Like you said its probably either in the switch wiring or in the ccm module either at the cluster or the module itself in the fusebox.
Start with the easiest which is the switch. put a little wooden dowell in the hole where the switch is and see if it will still pop up, try not to get the dowell stuck.(at the latch on the trunklid there is a recessed button)
Im not quite sure what the wiring of the switch looks like but ill look tmrw. it should be similar since we both have 89's. perhaps consulting the electrical diagrams might help.

[Racerhoze]

I didnt even know it gave trunk open warnings... something new every day.

Like you said its probably either in the switch wiring or in the ccm module either at the cluster or the module itself in the fusebox.
Start with the easiest which is the switch. put a little wooden dowell in the hole where the switch is and see if it will still pop up, try not to get the dowell stuck.(at the latch on the trunklid there is a recessed button)
Im not quite sure what the wiring of the switch looks like but ill look tmrw. it should be similar since we both have 89's. perhaps consulting the electrical diagrams might help.

I have sprayed WD-40 where the switch is and pressed it a million times with a screwdriver in hopes to clean any corrosion that may be inside, but that obviously didn't work.

[HotRodBimmer]

I'm not where i can look and see what the switch/wiring looks like, but can you unplug and hardwire it (the switch) just to see if the problem still persists?

[paperplane94]

PICS
Just a lil how to on getting to the switch.


It looks like disconnecting the switch should make the message go away.
light on


light off


NOTE the wire color: red/white and red/white.


remove the two 10mm's and disconnect the armture(it just snaps on and off.


remove the single Phillips screw and remove the switch

switch removed




all parts that pin at the top is what pushes in the switch button


At least now its well documented.

OP, try disconnecting the switch and see if the "trunk open"

Do our 89's even have this trunk open feature??? ive never seen it. I will try jumping the connector to trigger the message on mine. If it comes on at least then we can say that your message is because the two red/white wires are contacting/completing the circuit or the switch is bad.

[Racerhoze]

Yeah, it may take some speed to show the warning though. I didn't realize my car had the door open warning either till I drove with the door open. I will have to dig into my trunk lid when I find some time here in the coming weeks.
Thanks for documenting this so I will have some idea of what I am getting myself into!

[elic]

hey I do not have this option, It never gave me warning about open trunk I need to take a look if I even have this switch

[Racerhoze]

hey I do not have this option, It never gave me warning about open trunk I need to take a look if I even have this switch

open your trunk and drive like 10mph and see if it will warn you

[paperplane94]

well I jumpered the connector and drove around on the freeway. no messages 'cept the usual brake linings.

Maybe your ccm has a different software version or something. OR maybe it isn't the original.

EDIT: or mines not the original.

[Racerhoze]

So I noticed through my ski-pass that my trunk lights do not turn on when these spaz warnings are occurring. So now I am starting to think this is another fun issue with the caps in my cluster. Not only do I get suspension leveling, but trunk open! yay!

[uscharalph]

My trunk light wouldn't come on. The switch is the culprit. Add "replace trunk switch" to the short to do list.

[Racerhoze]

This thread is old balls.

My issue ended up being bad solder joints on my check control module (CCM). I got a used CCM and have not had the issue since.

[shogun]

A lot of 'fake' messages are caused by the aging CCM = cold solderings. In case you always see these"Check Control" messages although all is fine, it means that the signals were not received as expected. The fix is to re-solder every pad in the CCM, which is tedious. Spend this Quality time with your CCM! Use a 40 watt iron, outdoors.