Alarm
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The alarm in the 08/09 WRX is a Sigma S32. The alarm in the 99-2005 is a Sigma M30. Not sure about the in between.
Pic of my 09 WRX alarm module.
It's located cable tied to the head unit cage. There is probably more to it i only found this by accident while pulling out my Sat-Nav unit. It may be in a different location in a non Sat-Nav car.
Change PIN for Sigma S32
For at least the 2009 WRX but the manual is dated July 2007 so it may be good for the 2008 model as well.
Copied verbatim from the Security System Operating Instructions page 13.
With the Ignition switched off, the security system disarmed (and the immobiliser deactivated using the existing PIN if the optional Key Theft Protection feature is enabled) press a button to wake the keypad and illuminate the buttons, then enter the following:
*17856 *992 *ABCD *ABCD #
In the above sequence *17856 enters the programming mode, *992 is the access code/command which notifies the alaem unit to accept the new PIN code and ABCD represents the newly chosen 4-digit PIN. Note the * before inputting the new PIN and # afterwards to end the sequence, if you wish to change the PIN to 6789 you would press a button to wake the keypad and illuminate the buttons then type in:
*17856 Enters programming mode (siren will beep) *992 Access code to accept new PIN *6789 Enter the new PIN *6789 Confirm the new PIN # Stores the new PIN code to the security system. This will be followed by a bleep.
Subaru PDF of Alarm Manual from a 2008/2009 Impreza WRX Sigma S32
This Alarm manual is dated July 2007 so it is probably good for both the 2008 and 2009 Impreza but don't quote me on it.
The alarm is a Sigma S32.
2007 Security System Operating Instructions PDF
1999-2005 Sigma M30 manual.
Valid for:
Impreza: 1999 & 2000 MY TC2-808/0198 2001 & 2002 MY TC2-1199/0501 2003, 2004 & 2005 MY TC2-1265/1002 Forester: 1999, 2000 & Early 2001 MY TC2-808/0198 Late 2001 & 2002 MY TC2-1202/0501 2003, 2004 & 2005 MY TC2- 1265/1002 Legacy: 1999, 2000 & Early 2001 MY TC2-808/0198 Late 2001, 2002 & 2003 MY TC2-1203/0501 2004 & 2005 MY TC2-1265/0803