[Croc R]

The battery is dead on my Cayman, and I can't open the frunk. What now?

[Trak Ratt]

Originally Posted by Croc R

The battery is dead on my Cayman, and I can't open the frunk. What now?

If you can get into the car with a key borrow a lighter charger and charge the battery. 911s have a cable behind the left inner fender cover that releases the trunk latch.

Kind of far but I have a charger.

[tbernard]

Owners manual has a procedure of how to energize the car to pop the trunk.
You access a pin in the fuse panel, attach a 12volt jump box and you can pop the trunk.

There’s some, videos on YouTube for a visual.

[Croc R]

Thanks, guys.

[Otto]

in some cases, if the battery is completely dead, one must jump connected in the fuse box and then use the keyfob to open the hood

[HoodPin]

AFAIK, by the time the Cayman came out, they had situated a lug in the fuse panel, so that you could attach jumper cable; positive to the fuse panel lug, and negative to the door latch on the door opening frame. Early Boxsters required a small jumper wire to one of the fuses.

[Robert in Potomac]

Originally Posted by HoodPin

AFAIK, by the time the Cayman came out, they had situated a lug in the fuse panel, so that you could attach jumper cable; positive to the fuse panel lug, and negative to the door latch on the door opening frame.

This is procedure I just used to jump start my 997 911.

[Croc R]

Further developments: I followed the previous advice and opened the hood and charged the battery enough so it would start the next day. However, a week later, the battery was flat again. So, I opened the frunk again and hooked up the battery charger. This time, however, the horn started blowing and the driver's side window came down halfway. The horn could be turned off only by disconnecting the charger, and the window did not respond to its control when the battery was hooked up. Suggestions?

[HoodPin]

My guess is the battery is on its last legs. At low/inadequate voltage, strange things start happening. My suggestion would be to remove the battery and take it a local car parts store that also has a replacement in stock. Have them test your battery first, and if toast, get a replacement. If you can park the car proximate to an electrical outlet, consider getting a trickle charger, and wire up a pig tail to the battery. With most Porsches, you can feed the battery charging cable from the charger under the back edge of the frunk, at the base of the windshield. This enables you to fully close the frunk. Alternatively, you can also connect the trickle charger to the 12V outlet in the car, although you end up capturing the wire in the door gasket somewhere if you need to lock the door. If not parked in a garage, the 12V outlet might be preferable, to leave the charger inside the car.

Here's an example CTech charger with pig tail and battery clips:
https://www.amazon.com/CTEK-56-353-1...gateway&sr=8-3

And the optional 12V outlet cable:
https://www.amazon.com/CTEK-56-263-C...FY8BCCN8AD9B9Q

Additionally, if you're interested in testing the battery condition yourself, I've had good results with this battery condition tester. It allows you enter a number of parameters describing the battery, and it determines how well the battery is functioning.

https://www.amazon.com/BA7-100-1200-...68757b03ac43ae

[Trak Ratt]

X2 on bad battery. But I’d still have @ shop test for a drain. Our 964 was hard on batteries till Matt D. Found a bad auto lock on passenger door. Never would have thought of it but Matt said the bad lock caused the controller (??) to keep trying to lock the door