Why 06Tribeca audio button on steering wheel will not (+) volume but it will (-) volume. Also the mute button will not mute?

The 2015 Nissan Altima does not have a mute button for the Audio system. To unmute the Audio system You will have to turn the volume knob clockwise. If this does not fix the problems with the Audio in the vehicle You can try and attempt a full reset of the radio in Your car. To do this You will turn the ignition key to the "on" position and turn Your radio on, wait ten seconds and then turn Your radio off. Depress the radio power button again and wait for reset. Alternatively, enter Your dealer provided radio code to reset. You can also check to see if You had a call and if You did not press the "call hang up" button on the steering wheel while not on a call it could mute the radio so press it again to un mute it.

has your car got steering wheel controls for audio etc, if so check the steering wheel cassette

you can buy the switch from the dealer and they change very easy

Hi,if you have the code for radio,undo battery for 30mins then reatach battery,and you put the code in,hopfully it will be back to normal.ill keep my fingers crossed for you.

i would also check the mute or volume buttons on the steering wheel. spray them with a can of compressed air, hold the volume up and spray the minus and vise versa. hope this helps.

not sure what you mean - explain more so I can possibly help.
There is a function in the audio menu which increases the volume of the radio with increasing road speed, or there is a mute button on the dash (phone) or on the steering wheel controls (if fitted)

it could be your clockspring; it carries multiple electrical signals to and from the steering wheel (audio controls, horn, airbag). the wheel has to be removed to gain access to it for replacement, but it can be tested without removal. the easiest way to test it is with a diagnostic tool

My MKS had this exact problem earlier this year. I took it in and they ordered and replaced the buttons. It worked fine for about three months and now is starting to act up again. Have you gotten any definitive answers?

Depress the volume bottom or rotate the volume knob. When on a Bluetooth phone call, the speaker symbol will mute, but unmute when the call ends. Either rolling the right steering wheel scroll or the volume button on the shifter area will should unmute the radio volume.

The phone button is what does the muting.
If you feel that is not the problem I would suggest contacting the jaguar dealership in your area.