Wired headphone sound is weak, distorted, volume does not change, or there is no sound

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Check the vehicle battery condition first BATTERY TEST ).
You need to switch the audio-navigation unit REAR PWR button on for the rear display, remote controls, and sound to operate.
Check the headphone battery condition.

Substitute a known-good wired headphone set, and recheck.
Does the symptom go away?

YES -Original wired headphone set is faulty.

NO -Go to step 2.
Plug the wired headphones into the other ports of the RES auxiliary jack assembly to check their condition.
Do all the ports have the same symptom?

YES -Go to step 3.

NO -Replace the RES auxiliary jack assembly
Check that the wired headphone jack is properly connected.
Is the headphone jack connected properly?

YES -Go to step 4.

NO -Reconnect the wired headphone connector, and recheck.
Disconnect the RES auxiliary jack assembly 14P connector and the rear controller and screen 24P connector.

Check for continuity between body ground and rear controller and screen 24P connector according to the table.

Rear controller and screen connector	Wire color
No. 8	PNK
No. 20	GRN
No. 21	BLU

Fig 1: Checking Continuity Between Body Ground And 24P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -There is a short to body ground in the wire(s) between the rear controller and screen and the RES auxiliary jack assembly. Replace the affected shielded harness.

NO -Go to step 6.

Check for continuity between the terminals of rear controller and screen 24P connector according to the table.

From terminal	To terminals
No. 8 (PNK)	No. 9(BRN), No. 20 (GRN), No. 21 (BLU)
No. 9 (BRN)	No. 20 (GRN), No. 21 (BLU)
No. 20 (GRN)	No. 21 (BLU)

Fig 2: Checking Continuity Between 24P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity between any of the terminals?

YES -There is a short in the wires between the rear controller and screen and the RES auxiliary jack assembly. Replace the affected shielded harness.

NO -Go to step 7.

Check for continuity between rear controller and screen 24P connector and RES auxiliary jack assembly 14P connector according to the table.

Rear controller and screen connector	RES auxiliary jack assembly connector	Wire color
No. 8	No. 7	PNK
No. 20	No. 13	GRN
No. 21	No. 14	BLU

Fig 3: Identifying Rear Controller And Screen 24P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 4: Identifying RES Auxiliary Jack Assembly 14P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the RES auxiliary jack assembly

NO -There is an open in the wire(s) between the rear controller and screen and the RES auxiliary jack assembly. Replace the affected shielded harness.