Navigation System Symptom Troubleshooting - Poor RDS-TMC Reception or Interference

Poor RDS-TMC reception or interference NOTE: Check the RDS-TMC reception in an open area. Poor reception/interference can be caused by the following: The RDS-TMC station is too far away. Atmospheric condition are unfavorable. Tall buildings, mountains, or high-voltage power lines are nearby. Check if the RDS-TMC 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.■
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 navigation grounds. If OK, check the charging system and the ignition system.■
NO | - | Go to Step 3 .
Wrap aluminum foil (A) around the tip of a tester probe (B) as shown. |

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. Remove the navigation unit. Check that the antenna lead connection. Is it connected properly?
YES | - | Go to Step 6 .
NO | - | Reconnect the connector, and recheck the function.■
Disconnect the antenna cable 1P connectors from the window antenna. Remove the audio unit. |

Check for continuity between the navigation unit antenna cable connector H (3P) No.1 terminal and the window antenna 1P connector No. 1 terminal. Is there continuity?
YES | - | Go to Step 9 .
NO | - | Replace the antenna lead.■

Check for continuity between the navigation unit antenna cable connector H (3P) No. 1 terminal and body ground. Is there continuity?
YES | - | Replace the antenna lead.■
NO | - | Go to Step 10 .

Check for continuity between the navigation unit antenna cable connector H (3P) No. 1 and No. 2 terminals. Is there continuity?
YES | - | Replace the antenna lead.■
NO | - | Replace the navigation unit.■