Technical Hatchback open / red door open icon on dashboard

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Technical Hatchback open / red door open icon on dashboard

Richyh368

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Hi,

I am getting the rather annoying hatchback open / red door open icon on my dashboard, I have had the lock out and dryed it with a hair dryer, cleaned the connection, checked all the wiring and no damage.

Do any of you nice people know if I can just disconnect the door open sensor to get rid of the red light? If so do you know which one I need to remove?

Thanks in advance.
 
Hi!
Are you sure that the locks microswitch works OK, easy to check with a DVM, mine was completely chrushed internal and stuck in the "hatchback closed" position (no luggage light and no open hatchback warning), I "borroved" the switch from an old PC-mouse scrollhweel, now it works OK. There is a "howto" some where at this forum.
BRs. Kjeld
 
Thanks for the quick response, not tested the micro switch as that casing of the lock is proving to be a nightmare to get in to�� was hoping there was a nice easy option like removing the signal wire or fooling the system some how into thinking it's shut to get rid of the red light��
 
Seems that the switch bring earth to the body computer when hatch is closed, so disconnect the wire won't help, you'd have to ground it permanently …

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 

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Bernie,

Thank you for the above advice / diagrams. I am not the best with wiring diagrams so please excuse my novice question. would I therefore need to ground out the cable in port 4(Of the first diagram?) Sorry not the best with wiring diagrams
 
NO! That would be bad, resulting in a blown fuse and you would need to use the emergency button on the lock to open the hatchback, but you could try to shorten the two pins near the mid (pin 2 and 3) directly at the connector and see if that cures the alarm, you don't need the lock connected for that.
BRs. Kjeld
 
As always for electrical issues involving the doors or hatch have you checked the wires in the concertina rubber hose between the body and the hatch. They break and if the switch needs an earth, you won't get that if the wiring between the car and the hatch is broken
 
As Kjeld said, pin 2 needs to be grounded to inform the body computer that the hatch is closed, and as DGPunto said if the wire that brings that ground is broken, info will never reach the BC …

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 
Digging this one up, fighting with a second boot lock at the moment (first had the micro-switch locked in boot closed position, I saved it for emergencies, opening still works).

My current lock (after some working on it to make it better) grounds pin #2 when closing the lid, so the BC sees the open/close status of the boot, the dashboard light behaves as expected. But it does not short pin #1 when the lock is open, so I get no boot light. (Yes, I checked everything, I tested it by shorting the pins of the plug in the appropriate way, it's the micro-switch that fails, nothing else).

I also know that I cannot permanently short pin #1 , the light will stay on, BC does not turn it off on its side when it sees the boot closed (also just checked by playing the short the pins game).

So I am thinking, short of replacing the lock again, what are my options. Build a not-circuit to short pin #1 whenever pin #2 is open circuit, and vice versa? Any other hacks? I am a bit dumb when it comes to electricity.
 
Also I just realized shortly after saying this, any not-gate, transistor or relay based, would have to draw power when car is inactive, no go...
 
You could still power your circuit with "30" terminal (key ON) circuit ... As you can see on the drawing I posted, the hatch status (micro)switch is an inverter, so in one position it informs the BCM that the hatch is closed (no red warning @ dashboard) and in the other one it switches ON the trunk (boot) light, is that so complicated ?

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
 
No it is not, but my other position is not working, so I need to not-gate the boot closed BCM pin to operate the light. Meaning, the boot is closed, I get ground from the micro-switch, and that activates my circuit to switch off the light. When the boot is open I have the light shorted to ground by default to get it working. So how does key-on power help me here? I want the light to be off when the car is not used and the way I see it, it is then that would need power.

But if you mean another circuit that powers the light when it sees no ground on the boot pin, then sure, key-on power would work, but then no light when I just open the boot without getting into the car and putting the key on. Which is actually 99% of my use cases :/

(I can of course be getting all this totally wrong, I am really tired ATM).
 
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