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Mar 16, 2012 | 03:07 AM

#21

DeeGee

Tech Contributor

Joined: Dec 2003

Posts: 19,384

Likes: 87

From: Horncastle Lincolnshire, England

2023 C5 of the Year Finalist - Unmodified

Quote:

Originally Posted by BossV8

I checked the fuse. It is okay. I "followed" the wire that goes from the switch to the lock and it looks okay.
Maybe is it the relay in the hood fuse box but I doubt it ...

I assume the manual release works OK? If so, that proves the latch mechanism is OK.

You could try changing the relay with another similar one to prove it. Have you checked the wiring/connectors at the tonneau switch and the boot switch?

I'll check the manual

Last edited by DeeGee; Mar 16, 2012 at 03:25 AM.

Mar 16, 2012 | 03:11 AM

#22

BossV8

Thread Starter

Racer

Joined: Dec 2009

Posts: 357

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From: Pas de Calais

Yes manual works perfect.

Mar 16, 2012 | 03:12 AM

#23

DeeGee

Tech Contributor

Joined: Dec 2003

Posts: 19,384

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From: Horncastle Lincolnshire, England

2023 C5 of the Year Finalist - Unmodified

Another thought, what indication do you get from the "tonneau cover ajar" light when you pop the cover? Is it on or off?

With a problem with the tonneau switch the warning light might track it down.

This is how the system works:

The rear compartment lid is operated by the rear compartment lid release switch. When the switch is operated the body control module rear compartment lid release request is switched battery positive. The body control module will then ground the coil side of the htchtrk relay. When the relay is grounded the switch side closes and provides battery voltage to the rear compartment lid latch which will release the rear compartment. When the rear compartment lid is open, the rear compartment lid ajar switch is closed and provides an ajar input to the body control module.

If the tonneau switch is broken perhaps the signal is not being sent.

Last edited by DeeGee; Mar 16, 2012 at 03:26 AM.

Mar 16, 2012 | 03:29 AM

#24

DeeGee

Tech Contributor

Joined: Dec 2003

Posts: 19,384

Likes: 87

From: Horncastle Lincolnshire, England

2023 C5 of the Year Finalist - Unmodified

Here's the wiring digram which might help track it down. I still think you should replace the tonneau switch and take it from there.

Mar 16, 2012 | 03:49 AM

#25

BossV8

Thread Starter

Racer

Joined: Dec 2009

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From: Pas de Calais

Thank your for the diagram and explanation. As it becomes over my poor electrical skills (and translation "ajar" !), I'll discuss it with my tech mate.

Then I'll report back.

Thanks again.

Mar 16, 2012 | 04:39 AM

#26

RedRiderZR1

Drifting

Joined: Oct 2002

Posts: 1,773

Likes: 66

From: SoCal

Just throwing this out there because I'm not sure if this applies to you, but on the coupe if you turn the key on the drivers door 2 or 3 times it pops the trunk/boot. Does that work on convertibles as well? Maybe that works. Just a thought. Again not sure, just thought that could be a test as well.

Mar 16, 2012 | 05:30 AM

#27

BossV8

Thread Starter

Racer

Joined: Dec 2009

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From: Pas de Calais

The Trunk opening works perfect. It is the tonneau opening that doesn't work.

Thanks for the input, tho.

Mar 16, 2012 | 04:34 PM

#28

happiedazs

Pro

Joined: Apr 2006

Posts: 647

Likes: 22

From: Norwalk CT and Boynton Beach FL

Quote:

Originally Posted by DeeGee

Here's the wiring digram which might help track it down. I still think you should replace the tonneau switch and take it from there.

I can never figure out how to read these diagrams.
Is there a book someone can recommend or a link to a website that can get me up on the learning curve?

Thanks