Pinpoint Test G: Radio Interference

Refer to 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
• Wiring, terminals or connectors
• In-vehicle entertainment system

PINPOINT TEST G : RADIO INTERFERENCE 

• NOTE: If the Original Equipment Manufacturer (OEM) Audio Front Control Module (ACM) 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.
• NOTE: If the engine is operated at greater than 2, 000 rpm momentarily, the generator self-excites. Make sure when the generator is disconnected the engine rpm stays below 2, 000 rpm. If it does rise above 2, 000 rpm, 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.
• G1 VERIFY THE GENERATOR IS THE SOURCE OF THE RADIO INTERFERENCE
  
  
  • Start the engine and allow the engine to idle.
  • Tune the ACM to a station where the interference is present.
  • Ignition OFF.
  • Disconnect: Generator C102B .
  • Start the engine and allow the engine to idle, determine if the interference is still present.

  Is the interference present with the generator disconnected? 

  Yes	REFER to Information and Entertainment Systems for diagnosis and testing of the in-vehicle entertainment system.
  No	INSTALL a new generator. REFER to Generator - 3.7L .