Symptom Troubleshooting

Audio System Symptom Troubleshooting - Audio system information does not display on the audio display-USB adapter control unit

Audio system information does not display on the audio display-USB adapter control unit (without navigation, with USB adapter)

NOTE: Check the vehicle battery condition first Battery Test.

1. Check for poor connections or loose terminals at audio display-USB adapter control unit connector A (32P) and audio unit connector B (20P).

Are the connections or terminals OK?

YES -

Go to step 2.

NO -

Repair poor connections or loose terminals, and recheck.

2. Turn the ignition switch to ON (II).

3. Measure the voltage between body ground and audio display-USB adapter control unit connector A (32P) terminals No. 16 and No. 32 individually.





Is there battery voltage?

YES -

Go to step 4.

NO -

If the +B wire does not have voltage, repair an open in the wire between the No. B15 (20 A) fuse in the under-hood fuse/relay box and the audio display-USB adapter control unit. If the ACC wire does not have voltage, repair an open in the wire between the No. C13 (7.5 A) fuse in the driver's under-dash fuse/relay box and the audio display-USB adapter control unit.

4. Measure the voltage between audio display-USB adapter control unit connector A (32P) terminal No. 15 and body ground.





Is there less than 0.2 V?

YES -

Go to step 5.

NO -

Repair an open or high resistance in the wire between the audio display-USB adapter control unit and body ground (G501).

5. Turn the ignition switch to LOCK (0).

6. Disconnect audio display-USB adapter control unit connector A (32P) and audio unit connector B (20P).

7. Check for continuity between audio unit connector B (20P) and audio display-USB adapter control unit connector A (32P) according to the table.













Is there continuity?

YES -

Go to step 8.

NO -

There is an open in the wire(s) between the audio unit and the audio display-USB adapter control unit. Repair or replace the affected harness.

8. Check for continuity between body ground and audio unit connector B (20P) according to the table.









Is there continuity?

YES -

There is a short to body ground in the wire(s) between the audio unit and the audio display-USB adapter control unit. Repair or replace the affected harness.

NO -

Go to step 9.

9. Check for continuity between the terminals of audio unit connector B (20P) according to the table.









Is there continuity between any of the terminals?

YES -

There is a short in the wires between the audio unit and the audio display-USB adapter control unit. Replace the affected shielded harness.

NO -

Substitute a known-good audio display-USB adapter control unit Audio Display-USB Adapter Control Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio display-USB adapter control unit Audio Display-USB Adapter Control Unit Removal/Installation. If the symptom/indication is still present, replace the audio unit Audio Unit Removal/Installation.