I was wondering if anybody can give me some information on Retained
Accessory Power (RAP).
I'm trying to find a way to wire my XM radio to turn off as how the
current stock radio in my 2000 Chevrolet Cavalier turns off.
The current stock radio that's in there stays on after I turn off the
car and until I open the door, and I would like my XM radio to get its
power that way as well.
I'm not able to find a fuse that stays on after I turn off the car and
turns off after I open the door, and I'm not sure where to look or how
to do this.
Does anybody know where I can tap off of so I can wire my XM radio to
use the Retained Accessory Power feature?
Any helps or hints are appreciated.
On 26 Jul 2005 19:09:09 -0700, firstname.lastname@example.org wrote:
If you have power windows, are they on the RAP circuit as well? If
they are, that would help narrow down your search, since there are
only a few wires that go into the door, and one of them should stay
powered with the car off until the door is opened.
If not, I'd suggest turning off your car, pulling the stock radio out
(leaving the wiring harness connected), and probe all the wires until
you find the ones that have power (there should be at least two).
Then open the door and re-test the wires that had power previously.
One of them should have lost power when you opened the door, and that
would be the one to tap into.
"The most exciting phrase to hear in science, the one that heralds the most
Please note that the radio gets the RAP signal over the class 2 serial data
line from the Body Control Module. Unless you get inside the radio and
somehow tap off its internal power bus I don't think your XM plans are going
to come to fruition. See description from the service manual below.
Document ID# 853000
2000 Chevrolet/Geo Cavalier
Retained Accessory Power (RAP) Description
Serial Data Controlled Retained Accessory Power, RAP
Retained accessory power, RAP is a vehicle power mode that permits the
operation of selected customer convenience items after the ignition switch
is turned OFF. These selected items will remain in operation until a
passenger compartment door is opened or until the RAP function timer reaches
its shut-off limit.
The Audio system on this vehicle is the only device that is controlled by
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