Note. Check the vehicle battery condition first (see BATTERY TEST ). Check the connectors for poor connections or loose terminals.
- Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
- Turn the combination lighting switch to the parking light position.
- Check the illumination of the audio unit buttons. Are the buttons illuminated? YES -Intermittent failure, the system is OK at this time. Check for loose or poor connections at audio unit connector A (24P). NO -Go to step 4.
- Check the illumination of several other buttons not related to the audio system. Are the buttons Illuminated? YES -Go to step 6 . NO -Troubleshoot the interior lights. Start by checking the No. 6 (7.5 A) fuse in the passenger's under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the passenger's under-dash fuse/relay box and the audio unit.
- Turn the combination lighting switch to the off position.
- Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
- Disconnect audio unit connector A (24P). NOTE: Eject all the CDs before disconnecting the audio unit to prevent damaging the CD player's load mechanism.
- Disconnect the gauge control module 32P connector.
- Check for continuity between audio unit connector A (24P) terminal No. 1 and gauge control module 32P connector terminal No. 21. Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the audio unit and the gauge control module.
- Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
- With the combination lighting switch to the parking light position, measure the voltage between audio unit connector A (24P) terminal No. 13 and body ground. Is there battery voltage? YES -Replace the audio unit (see «AUDIO UNIT REMOVAL/INSTALLATION»(ref-512387-S19838219002012103100000) ). NO -Repair an open in the wire between the passenger's under-dash fuse/relay box and the audio unit.