Pinpoint Test D : Radio Interference: Notes

Radio Interference

Refer to Charging System for schematic and connector information.

Normal Operation and Fault Conditions

The generator radio suppression equipment reduces interference transmitted through the speakers by the vehicle electrical system.

NOTE: If the Original Equipment Manufacturer (OEM) Audio Control Module (ACM) has been replaced with an aftermarket unit, the vehicle may not pass this test. Return the vehicle to Original Equipment Manufacturer (OEM) condition before following this pinpoint test.

NOTE: Make sure the engine rpm stays below 2, 000 Revolutions Per Minute (RPM) when the generator is disconnected. If it rises above 2, 000 Revolutions Per Minute (RPM) the generator may self-excite. If this occurs, turn the ignition to the OFF position and start the test over again.

NOTE: Inspect for any aftermarket accessories that have been added to the vehicle. Check the wiring for these accessories and be sure they have not been attached to the generator circuits and are positioned away from the generator wiring.

Possible Sources

Generator
In-vehicle entertainment system
Wiring, terminals or connectors

Visual Inspection and Diagnostic Pre-checks

Inspect the generator.
Inspect the in-vehicle entertainment system.