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 12 volt battery condition first.
Set the fader and the balance positions to the center.
Use auxiliary stereo cables with 3.5 mm ends only.
Check the connectors for poor connections or loose terminals.
1.
Problem verification 1:

Problem verification 1
?1.
Turn the vehicle to the ON mode.

?2.
Turn on the audio system.

?3.
Connect an auxiliary 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:

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):

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
     
     
     
The failure is duplicated, go to step 9.
4.
Determine possible failure area (auxiliary jack assembly, others):

Determine possible failure area (auxiliary jack assembly, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the auxiliary accessory from the auxiliary input jack.

?3.
Disconnect the following connector.
Auxiliary jack assembly 5P connector

?4.
Turn the vehicle to the ON mode.

?5.
Turn on the audio system.

?6.
Connect terminals A and B with a jumper wire.

Does the display change to the AUX mode?

     
YES
     
     
     
     
NO
     
     
     
Go to step 5.
5.
Determine possible failure area (AUX DET line, others):

Determine possible failure area (AUX DET line, others)
?1.
Remove the jumper wire.

?2.
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 3.0 V?

     
YES
     
     
     
The AUX DET wire is OK. Go to step 7.
     
NO
     
     
     
Go to step 6.
6.
Open wire check (AUX DET line):

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 B (32P) No. 9
Test point 2
Body ground

Is there about 3.0 V?

     
YES
     
     
     
Repair an open in the wire.?
     
NO
     
     
     
7.
Determine possible failure area (AUX GND line, others):

Determine possible failure area (AUX GND line, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Auxiliary jack assembly 5P connector: disconnected
Test point 1
Auxiliary jack assembly 5P connector No. 4
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Go to step 8.
8.
Open wire check (AUX GND line):

Open wire check (AUX GND line)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Auxiliary jack assembly 5P connector: disconnected
Test point 1
Audio unit connector B (32P) No. 27
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair an open in the wire.?
     
NO
     
     
     
9.
Shorted wire check (AUX R CH, AUX SGND, AUX L CH lines):

Shorted wire check (AUX R CH, AUX SGND, AUX L CH lines)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the auxiliary accessory from the auxiliary input jack.

?3.
Disconnect the following connectors.
Audio unit connector B (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 B (32P): disconnected
 
Auxiliary jack assembly 5P connector: disconnected

Connector
Test circuit
Audio unit connector B (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 R CH, AUX SGND, and AUX L CH wires are not shorted to ground. Go to step 10.
10.
Shorted wire check (SH AUX line to another lines):

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 (32P): disconnected
 
Auxiliary jack assembly 5P connector: disconnected

Test point 1:
Audio unit connector B (32P)
Test points 2:
Audio unit connector B (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 SH AUX wire is OK. Go to step 11.
11.
Shorted wire check (AUX SGND line to another lines):

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


Is there continuity?

     
YES
     
     
     
There is a short in the wires. Replace the affected shielded harness.?
     
NO
     
     
     
The AUX SGND wire is not shorted. Go to step 12.
12.
Open wire check (AUX R CH, AUX SGND, AUX L CH lines):

Open wire check (AUX R CH, AUX SGND, AUX L CH lines)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector B (32P): disconnected
 
Auxiliary jack assembly 5P connector: disconnected

Test point 1:
Audio unit connector B (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 R CH, AUX SGND, and AUX L CH wires are OK. Go to step 13.
     
NO
     
     
     
There is an open in the wire(s). Replace the affected shielded harness.?
13.
Auxiliary jack assembly check:

Auxiliary jack assembly check
?1.
Substitute a known-good USB adapter holder/auxiliary jack assembly.

?2.
Reconnect all the connectors, and recheck.

Does the symptom go away?

     
YES
     
     
     
Replace the original USB adapter holder/auxiliary jack assembly.?
     
NO