Radio - Interference, Poor Recption On AM: Overview

CATEGORY
Electrical

SECTION
3

ISSUE
03/97-0751

PAGE
98

CODE
367

Subject:
Radio Interference on AM

Application: 900 M94-





The action steps in this bulletin have been produced for use in connection with customer concerns/complaints about interference or poor radio reception when listening to AM stations. Always try to get the customer to describe the nature of the interference as precisely as possible, e.g. extraneous noise, tones, crackling, frying, motorboating, etc. and the circumstances in which the interference occurs.

Cars Affected:

Saab 900 M94-. For detailed information, see the relevant type of interference in point C.

Parts:

48 11 214 Processor card for main instrument display

48 72 677 Interference suppression kit for ICE containing:
Interference suppression capacitor
Terminal pin

48 72 685 Interference suppression kit for Trionic containing:
Interference suppression capacitor
Terminal/crimp pin

49 00 015 Interference suppression kit for Motronic containing:
Grounding braids (4)
Sheet metal screws (3)
Lock washers (8)
Hose clamp

Action:

Note
Only the system or systems that the following trouble-shooting procedures show as the cause of interference are to be rectified.

If the car's antenna is in poor condition, the radio will be less resistant to interference and radio reception in general will be substandard. Therefore, start fault diagnosis by inspecting the antenna.