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

   -1. Turn the vehicle to the ON mode.

   -2. Turn on the audio system.

   -3. Connect an auxiliary audio accessory to the auxiliary input jack.

   Does the display change to the AUX mode?

   YES 

   Go to step 2.

   NO 

   The failure is duplicated, go to step 4.

2. Problem verification 2

   -1. 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 3.

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

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

   Is the sound normal?

   YES 

   Original auxiliary audio accessory or auxiliary stereo cable is faulty.

   NO 

   Go to step 8.

4. Determine possible failure area (auxiliary jack assembly, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the auxiliary audio accessory from the auxiliary input jack.

   -3. Disconnect the following connector.

   Auxiliary jack assembly 5P connector

   -4. Connect terminals A and B with a jumper wire.

   Terminal A	Auxiliary jack assembly 5P connector No. 4
   Terminal B	Auxiliary jack assembly 5P connector No. 5

   -5. Turn the vehicle to the ON mode.

   -6. Turn on the audio system.

   Does the display change to the AUX mode?

   YES 

   Replace the auxiliary jack assembly .

   NO 

   Go to step 5.

5. Determine possible failure area (AUX detect circuit, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Remove the jumper wire.

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Auxiliary jack assembly 5P connector: disconnected
   Test point 1	Auxiliary jack assembly 5P connector No. 4
   Test point 2	Auxiliary jack assembly 5P connector No. 5

   Is there about 3.3 V?

   YES 

   Replace the audio unit .

   NO 

   Go to step 6.

6. Determine possible failure area (AUX DET line, others)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Auxiliary jack assembly 5P connector: disconnected
   Test point 1	Auxiliary jack assembly 5P connector No. 5
   Test point 2	Body ground

   Is there about 3.3 V?

   YES 

   Repair an open in the wire.

   NO 

   Go to step 7.

7. Open wire check (AUX DET line)

   -1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Auxiliary jack assembly 5P connector: disconnected
   Test point 1	Audio unit connector C (32P) No. 9
   Test point 2	Body ground

   Is there about 3.3 V?

   YES 

   Repair an open in the wire.

   NO 

   Replace the audio unit .

8. Shorted wire check (AUX SGND, AUX R CH, AUX L CH lines)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the auxiliary audio accessory from the auxiliary input jack.

   -3. Disconnect the following connectors.

   Audio unit connector C (32P)

   Auxiliary jack assembly 5P connector

   -4. Check for continuity between these test points and body ground individually.

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector C (32P): disconnected
   	Auxiliary jack assembly 5P connector: disconnected

   Connector	Terminal
   Audio unit connector C (32P)	No. 24
   	No. 25
   	No. 26

   Is there continuity?

   YES 

   There is a short to body ground in the wire(s). Replace the affected shielded harness.

   NO 

   The AUX SGND, AUX LCH, and AUX RCH wires are not shorted to ground. Go to step 9.

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector C (32P): disconnected
   	Auxiliary jack assembly 5P connector: disconnected

   Test point 1:Audio unit connector C (32P)	Test point 2:Audio unit connector C (32P)
   No. 8	No. 24, No. 25, No. 26

   Is there continuity between any of the terminals?

   YES 

   There is a short in the wires. Replace the affected shielded harness.

   NO 

   The AUX SH wire is OK. Go to step 10.

10. Open wire check (AUX SGND, AUX R CH, AUX L CH lines)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Audio unit connector C (32P): disconnected
    	Auxiliary jack assembly 5P connector: disconnected

    Test point 1:Audio unit connector C (32P)	Test point 2:Auxiliary jack assembly 5P connector
    No. 24	No. 1
    No. 25	No. 3
    No. 26	No. 2

    Is there continuity?

    YES 

    The AUX SGND, AUX L CH, and AUX R CH wires are OK. Go to step 11.

    NO 

    There is an open in the wire(s). Replace the affected shielded harness.

11. 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 .