Radio - Interference/Noise On AM Band: Overview

V70/XC70 2001-
S80 1999-

Section
3

Group
39

No.
0025

Year
01

Month
07

Reference:
This service bulletin replaces the previous service bulletin SB 390025 from February 2001, which should be discarded.

Purpose:
Additional source of electrical interference, V70 rear seat ground, is added.

AM Radio diagnostics, interference

Background

This Service Bulletin explains how to fault trace sources electrical interference with the AM radio. Electrical interference can influence the quality of radio output, and can sometimes be confused with poor AM reception because the result is similar. Static is heard in the speakers.

Before deciding to fault trace for AM interference, refer to Service Bulletin 39-0018: AM Radio Reception Diagnosing. It the number of received stations compares to a similar car, the cause of static may be electrical interference. After determining that the antenna system and station reception are not the primary cause, follow the diagnostic information in this Service Bulletin.

Electrical interference causes static noise by inducing a signal that is picked up by the vehicle wiring and transported through the antenna input to the AUM. Electrical interference is usually noticed as static on the AM band, and is most noticeable between stations. To determine the source of electrical interference, the best method is to selectively isolate or activate switches and nodes, one at a time, until the static is reproduced or eliminated. Static caused by electrical interference is usually rhythmic and reproducible.








Select necessary parts according to diagnostics





WARRANTY STATEMENT: Claims may be submitted under the New Car Warranty when there is a documented customer complaint, using claim type 01.