Radio Tuner Does Not Change Stations

Special Tools Required
- Radio test harness breakout box 07AAZ-SDAA100
- Radio test harness 070AZ-SEAA200

Radio tuner does not change stations

1. Operate the tuner knob to see if the tuner changes accordingly.

Does it change?

YES - Operation is normal.

NO - Go to step 2.

2. Operate the tuner knob to see if the LCD display changes accordingly.

Does it change?

YES - Replace the audio unit.

NO - Go to step 3.

3. Remove the audio unit.
4. Connect the test harness (070AZ-SEAA200A with navigation or 070AZ-SEAA200B without navigation) to radio test harness breakout box (07AAZ-SDAA100).







5. Connect the test harness (070AZ-SEAA200A with navigation or 070AZ-SEAA200B without navigation) to the printed circuit board connector.
6. Connect the ohm meter to the special tool (07AAZ-SDAA100) TUNE-A terminal and TUNE-B terminal.
7. Turn the tuner knob clockwise one click at a time. The resistance should change as follows with each turn of the knob:

100 ohms -> infinity -> 100 ohms -> infinity -> 100 ohms

Does the resistance change as indicated?

YES - Replace the audio unit.

NO - Replace the audio-HVAC display panel.