( TL19E00J10300000000FAAT09 )

Audio System Symptom Troubleshooting - Audio unit button illumination does not work (without navigation system)

1. With the headlight switch still on, measure the voltage between the audio unit connector A (24P) terminal No. 13 and body ground.

Is there battery voltage?

YES | - | Check the connections at the audio unit connector A (24P). If all connections are OK, substitute a known-good audio unit and recheck. If the symptom/indication goes away, replace the original audio unit. ■
NO | - | Repair open in the wire between the passenger's under-dash fuse/relay box and audio unit.■