Auxiliary Input Sound Is Low or Cannot Be Heard

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 Testing and Inspection.
- Check the connectors for poor connections or loose terminals.
- Use auxiliary stereo cables with 3.5 mm ends only.
- Auxiliary accessories may be played on the audio unit using the auxiliary input.

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

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

3. Adjust the audio unit volume and check the audio unit in all modes (AM, FM, CD, XM, etc.)

Is the sound normal from the vehicle speakers?

YES -

Operation is normal at this time.�

NO -

Go to step 4.

4. Turn on the auxiliary audio accessory and make sure the auxiliary accessory volume is set to max.

Do you hear the auxiliary audio accessory?

YES -

Tell the client they need to adjust the volume on their accessory unit to high.�

NO -

Go to step 5.

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

Does the auxiliary audio accessory operate properly from the vehicle speakers?

YES -

Original auxiliary audio accessory or the auxiliary stereo cable is faulty.�

NO -

Go to step 6.

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

7. Remove the auxiliary jack assembly Auxiliary Jack Assembly Replacement and check that the auxiliary jack assembly is properly connected.

Is the auxiliary jack assembly connected properly?

YES -

Go to step 8.

NO -

Reconnect the connector, and recheck the function.�

8. Disconnect the auxiliary jack assembly 5P connector.

9. Disconnect audio unit connector D (6P).

10. Check for continuity between body ground and audio unit connector D (6P) 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 auxiliary jack assembly. Replace the affected shielded harness.�

NO -

Go to step 11.

11. Check for continuity between the terminals of audio unit connector D (6P) according to the table.









Is there continuity?

YES -

There is a short in the wire(s) between the audio unit and the auxiliary jack assembly. Replace the affected shielded harness.�

NO -

Go to step 12.

12. Check for continuity between audio unit connector D (6P) and the auxiliary jack assembly 5P connector according to the table.









Is there continuity?

YES -

Substitute a known-good auxiliary jack assembly Auxiliary Jack Assembly Replacement, and recheck. If the symptom/indication goes away, replace the original auxiliary jack assembly Auxiliary Jack Assembly Replacement. If the symptom/indication is still present, replace the audio unit Audio Unit Removal / Installation.�

NO -

There is an open in the wire(s) between the audio unit and the auxiliary jack assembly. Replace the affected shielded harness.�