Interference noises from rear subwoofer speaker (pop)

INTERFERENCE NOISES FROM REAR SUBWOOFER SPEAKER (POP)

Model

Discovery

Affected vehicles

Discovery models fitted with subwoofer speaker from LJ 081991 to LJ 083825

Date

1994-07-21

Reference

21/07/94

Bulletin text

SUBJECT Intereference Noises From Rear Subwoofer Speaker (POP)

MODEL AFFECTED VEHICLES

Discovery models fitted with subwoofer speaker from Discovery LJ 081991 to LJ 083825

DETAIL

Discovery vehicles between the above 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.

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 firstly removing the taildoor subwoofer assembly.

21/07/94

86/12/94/EN

WARRANTY

Normal warranty policy and procedure applies.

COMP. CODE

6X4K

SRO

86.50.36 - Amplifier renew - 00.55 hour