Pinpoint Test E: Radio Interference
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
Refer to appropriate SYSTEM WIRING DIAGRAMS article, Charging System for schematic and connector information.
Normal Operation
The generator radio suppression equipment reduces interference transmitted through the speakers by the vehicle electrical system.
This pinpoint test is intended to diagnose the following:
- Generator
- Circuitry
- In-vehicle entertainment system
PINPOINT TEST E: RADIO INTERFERENCE
- E1 VERIFY THE GENERATOR IS THE SOURCE OF THE RADIO INTERFERENCE NOTE: If the OEM audio unit has been replaced with an aftermarket unit, the vehicle may not pass this test. Return the vehicle to OEM condition before following this pinpoint test.
- Key in START position.
- Start and run the engine.
- Tune the audio unit to a station where the interference is present.
- Key in OFF position.
- Disconnect: Generator C102b
- Key in START position.
- With the engine running, determine if the interference is still present.
- Is the interference present with the generator disconnected?
- YES : REFER to INFORMATION & ENTERTAINMENT SYSTEMS article for diagnosis and testing of the in-vehicle entertainment system.
- NO : INSTALL a new generator. REFER to GENERATOR & REGULATOR article. TEST the system for normal operation.