Audio System Symptom Troubleshooting - Auxiliary input sound is low or cannot be heard(With Normal Audio)

Auxiliary input sound is low or cannot be heard 

NOTE: 

• Check the vehicle 12 volt battery condition first .
• Use auxiliary stereo cables with 3.5 mm ends only.
• Auxiliary accessories may be played on the audio unit using the auxiliary input.
• Check the connectors for poor connections or loose terminals.

• 1. Problem verification:

  - 1. Turn the vehicle to the ON mode.

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

  - 3. Press the AUX 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 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 vehicle to the OFF (LOCK) mode.

  - 2. Disconnect the following connectors.

  Audio unit connector B (20P)

  Auxiliary jack assembly 5P connector

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

  Test condition	Vehicle OFF (LOCK) mode
  	Audio unit connector B (20P): disconnected
  	Auxiliary jack assembly 5P connector: disconnected

  Connector	Terminal
  Audio unit connector B (20P) - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)	No. 6
  	No. 8
  	No. 16
  	No. 17
  	No. 18

  Is there continuity?

  YES 

  There is a short to body ground in the wire(s) between the audio 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.

  Test condition	Vehicle OFF (LOCK) mode
  	Audio unit connector B (20P): disconnected
  	Auxiliary jack assembly 5P connector: disconnected
  Test point 1	Audio unit connector B (20P) No. 17 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Audio unit connector B (20P) No. 7 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)

  Test point 1	Audio unit connector B (20P) No. 18 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Audio unit connector B (20P) No. 7 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)

  Is there continuity?

  YES 

  There is a short in the wires between the audio 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.

  Test condition	Vehicle OFF (LOCK) mode
  	Audio unit connector B (20P): disconnected
  	Auxiliary jack assembly 5P connector: disconnected
  Test point 1	Audio unit connector B (20P) No. 17 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Audio unit connector B (20P) No. 8 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)

  Test point 1	Audio unit connector B (20P) No. 18 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Audio unit connector B (20P) No. 8 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)

  Is there continuity?

  YES 

  There is a short in the wires between the audio 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 lines):

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

  Test condition	Vehicle OFF (LOCK) mode
  	Audio unit connector B (20P): disconnected
  	Auxiliary jack assembly 5P connector: disconnected

  Test point 1:  Audio unit connector B (20P) - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)	Test point 2:  Auxiliary jack assembly 5P connector
  No. 6	No. 4
  No. 8	No. 3
  No. 16	No. 5
  No. 17	No. 1
  No. 18	No. 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 unit and the auxiliary jack assembly. Repair or replace the affected harness.

• 8. Auxiliary jack assembly check (substitution):

  - 1. Substitute a known-good auxiliary jack assembly .

  - 2. Reconnect all the connectors, and recheck.

  Does the symptom go away?

  YES 

  Replace the original auxiliary jack assembly .

  NO 

  Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .