Alarm - Flashes lights four times

[Scott C]

On my '08 GTS I have a few things happening.  First, when arming the alarm, the hazards flash four times instead o the customary two.  Is this an indication of a malfunction? 

Second, the rear hatch will not fully close when pressing the button on the liftgate.  It will close when pressure is applied to the gate when closing. 

 

Both of these happened after the dealer replaced the driver's door module and re-coded the car. 

 

Any ideas on where to begin?  Other than going back to the dealer.

Edited August 11, 2017 by Scott C
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[lewisweller]

5 minutes ago, Scott C said:

On my '08 GTS I have a few things happening.  First, when arming the alarm, the hazards flash four times instead o the customary two.  Is this an indication of a malfunction? 

Second, the rear hatch will not fully close when pressing the button on the liftgate.  It will close when pressure is applied to the gate when closing. 

 

Both of these happened after the dealer replaced the driver's door module and re-coded the car. 

 

Any ideas on where to begin?  Other than going back to the dealer.

Go back to the dealer, this is surely a software issue and only the dealer can resolve this really. 

[Loren]

I agree - take it back.

This should be a warranty repair.

[Scott C]

Thanks guys.

 

Ugh...  This will be the second time taking it back to resolve programming issues related to the door module.

 

[JPA1]

I think the dealer did not troubleshoot correctly and the root cause is that your rear gate is not closing properly probably due to aging or faulty system ; I had the same problem (hydraulic / micro switch) on a Mercedes ML... the 4 flashes is because one of the doors (in this case the rear ) is not close properly...when you force close the rear , is the alarm function correctly?


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[Scott C]

@JPA1, I think a door switch is more likely given the two behaviors.  Back in college I installed mobile security systems and saw this behavior quite a bit.

 

If I knew for sure the source of the four flashes, it would tell me volumes about where to focus next.  Given the rear gate behavior, the two are likely linked.

 

I haven't noted the flashing behavior on the force close.....  Will do this and report back.

[Scott C]

More info.  Tailgate open, the lights flash twice.  tailgate closed, they flash four times.

 

I unplugged the microswitch in the tailgate latch and it rendered the auto open feature useless.

 

I'm now suspecting that they missed coding the rear liftgate as assisted opening.