Rear Subwoofer Thump or Pop Noises
Amplifier: All Technical Service Bulletins
Rear Subwoofer - Thump or Pop Noises
NO. 86/06/94/US
DATE: 07/29/94
MODEL
Discovery
AFFECTED VEHICLES
Discovery models from LJ 081991 to LJ 083825
SUBJECT
Audio Noises From Rear Subwoofer Speaker
DETAIL
Discovery vehicles between the listed VINs may have been built with subwoofer amplifier STC 946. With this amplifier the rear subwoofer speaker may
emit a "POP" or "THUMP" type noise when the ignition is on (position II at the ignition key) and the brake lights are activated. The noise is most
audible with the radio unit off, or with the radio on but at minimum volume.
NOTE
For noises emitted from the "E" post speakers refer to bulletin 86/02/94/US
ACTION REQUIRED
On customer complaint, verify symptoms and cause, replace amplifier if required.
PARTS INFORMATION
Amplifier STC 946 is replaced by STC 1824
PROCEDURE
Refer to the workshop manual section 86 for removal procedure. The amplifier is located at the rear of the subwoofer assembly and access is gained by
first removing the taildoor subwoofer assembly.
WARRANTY
Normal warranty policy and procedure applies.
COMP. CODE
6X4K
SRO
86.50.36 - Amplifier renew - 00.55 hour