Auxiliary Input Sound Is Low or Cannot Be Heard (With Navigation)

Audio System Symptom Troubleshooting - Auxiliary input sound is low or cannot be heard

Auxiliary input sound is low or cannot be heard

NOTE:
* Check the vehicle battery condition first Component Tests and General Diagnostics.
* Use auxiliary stereo cables with 3.5 mm ends only.
* Auxiliary accessories may be played on the audio-navigation unit using the auxiliary input.
* Check the connectors for poor connections or loose terminals.

1. Problem verification:

-1. Turn the ignition switch to ON (II).

-2. Turn on the audio system, and connect an auxiliary accessory to the auxiliary input jack.

-3. Press the AUDIO button, and check the auxiliary audio source sound.

Is the sound normal?
-YES- Intermittent failure, the system is OK at this time.
-NO- The failure is duplicated, go to step 2.

2. Determine possible failure area (volume level, others):

-1. Make sure the auxiliary accessory volume is set to high.

Is the volume set to high?
-YES- Go to step 3.
-NO- Raise the auxiliary accessory volume to high. Make sure the audio-navigation unit volume is turned down before rechecking.

3. Determine possible failure area (auxiliary audio accessory, others):

-1. Substitute a known-good auxiliary audio accessory and/or auxiliary stereo cable, and recheck.

Does the auxiliary audio accessory operate properly?
-YES- Original auxiliary audio accessory or auxiliary stereo cable is faulty.
-NO- Go to step 4.

4. Shorted wire check (AUX lines):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connectors.






-3. Check for continuity between these test points and body ground individually.














Is there continuity?
-YES- There is a short to body ground in the wire(s) between the audio-navigation unit and the auxiliary jack assembly. Repair or replace the affected harness.
-NO- The AUX wires are not shorted to ground. Go to step 5.

5. Shorted wire check (SH AUX line to another lines):

-1. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- There is a short in the wires between the audio-navigation unit and the auxiliary jack assembly. Replace the affected shielded harness.
-NO- The SH AUX wire is OK. Go to step 6.

6. Shorted wire check (AUX SGND line to another lines):

-1. Check for continuity between test points 1 and 2.














Is there continuity?
-YES- There is a short in the wires between the audio-navigation unit and the auxiliary jack assembly. Replace the affected shielded harness.
-NO- The AUX SGND wire is not shorted. Go to step 7.

7. Open wire check (AUX line):

-1. Check for continuity between test points 1 and 2.

















Is there continuity?
-YES- The AUX wires are OK. Go to step 8.
-NO- There is an open in the wire(s) between the audio-navigation unit and the auxiliary jack assembly. Repair or replace the affected harness.

8. Audio-navigation unit check:

-1. Substitute a known-good auxiliary jack assembly Auxiliary Jack Assembly Removal and Installation, and recheck.

Does the symptom go away?
-YES- Replace the original auxiliary jack assembly.
-NO- Replace the audio-navigation unit Audio-Navigation Unit Removal and Installation.