Audio System Symptom Troubleshooting - Poor AM or FM radio reception or interference
Poor AM/FM radio reception or interference
NOTE: Check the radio reception in an open area. Poor reception/interference can be caused by the following:
  • The radio station is too far away.
  • Atmospheric condition are unfavorable.
  • Tall buildings, mountains, or high-voltage power lines are nearby.
  1. Check if the radio reception/interference is the same in several locations.
Is the reception/interference the same?
YES -
Go to Step 2 .
NO -
Multipath interference or weak station. Operation is normal.■
  1. Check the reception/interference while the engine is running.
Is there noise (static or whine) only with the engine running?
YES -
Check the antenna and radio grounds. If OK, check the charging system and the ignition system.■
NO -
Go to Step 3 .
  1. Wrap aluminum foil (A) around the tip of a tester probe (B) as shown.
  1. Touch one tester probe to the window near antenna terminal (A) here, and move the other tester probe along the antenna wires to check that continuity exists. Repair if continuity does not exist.
  1. Remove the audio unit. Check that the antenna lead connection.
Is it connected properly?
YES -
Go to Step 6 .
NO -
Reconnect the connector, and recheck the function.■
  1. Measure the voltage between the antenna module connector No. 3 terminal at the antenna module lead and body ground.
Is there battery voltage?
YES -
Go to Step 8 .
NO -
Faulty antenna cable.■
  1. Check for continuity between audio unit antenna cable connector F (3P) terminal No. 3 and the antenna module 3P connector No. 3 terminal.
Is there continuity?
YES -
Go to Step 10 .
NO -
Repair the open in the wire between the audio unit and the antenna module.■
  1. Check for continuity between the audio unit antenna cable connector F (3P) No. 1 terminal and the antenna module 3P connector No. 1 terminal.
Is there continuity?
YES -
Go to Step 11 .
NO -
Replace the antenna lead.■
  1. Check for continuity between the audio unit antenna cable connector F (3P) No. 1 terminal and body ground.
Is there continuity?
YES -
Replace the antenna lead.■
NO -
Go to Step 12 .
  1. Check for continuity between the audio unit antenna cable connector F (3P) No. 2 terminal and the antenna module 3P connector No. 2 terminal.
Is there continuity?
YES -
Replace the antenna lead.■
NO -
Go to Step 13 .
  1. Check for continuity between the audio unit antenna cable connector F (3P) No. 1 and No. 2 terminals.
Is there continuity?
YES -
Replace the antenna lead.■
NO -
Replace the antenna module, and recheck. If the reception is still poor, replace the audio unit.■