Audio System - Poor Subwoofer Performance

No: TSB-09-54-012

DATE: October, 2009

MODEL: See below

Subject:
MALFUNCTIONING SUBWOOFER SPEAKER REPLACEMENT & AMPLIFIER EXCHANGE

This TSB supercedes TSB-08-54-003, issued March, 2008, to revise information relating to affected vehicles and advise additional countermeasures to the amplifier. revised information id indicated by <.

PURPOSE <

Customers of some affected vehicles equipped with the Rockford Fosgate Audio System may notice the subwoofer speaker produces little or no sound, or produces abnormal noise (e.g. static). This may be due to a shorted speaker coil, caused when the following conditions are present:

^ With some audio settings and/or audio sources, the output of the amplifier may be too great for the subwoofer.

AND/OR

^ Under certain ambient temperature conditions, the subwoofer may not properly dissipate heat.

If you diagnose a vehicle with this condition, install a new subwoofer speaker and exchange amplifier with revised logic.

Additional countermeasures have been taken to limit subwoofer output for affected vehicles.

AFFECTED VEHICLES <
2008-09 Lancer
2008-09 Lancer Evolution

Affected vehicles equipped with Rockford Fosgate Audio built prior to VIN 9U025913 (10/01/2008).

REPAIR PROCEDURE

Replace the audio amplifier and subwoofer speaker. Refer to Section 54 Chassis Electrical of the applicable service manual for details. After completing repairs, confirm the condition has been corrected.

CAUTION!
The interior components of the vehicle must be protected to prevent damage when removing the seat from both its mounting points and the vehicle. Use shop blankets to cover areas where damage could occur when removing the seat.





PARTS INFORMATION <

NOTE:
The amplifier MUST be ordered through the MMNA audio component exchange program.





WARRANTY INFORMATION