WX-GT90BT, WX-GT90BTE, WX-GT99BT, WX-GT99BTM - Sony Car Audio Service Manual (repair manual). Page 24

Setting method:
1.  Press the [

 

OFF SOURCE] button for 1 second to turn the 

power off.

2.  Press the [

 4] 

t [MIC/ZAP 5] t [V

 

ALBUM 1] buttons 

sequentially (the [V

 

ALBUM 1] button is pressed for two sec-

onds).

3.  It is set to the test mode, and all segments of the liquid crystal 

display light.

Releasing method:
Press the [

 

OFF SOURCE] button for 1 second.

MICROPHONE  AUDIO  LOOPBACK
To confi rm the state of the external microphone used when a 
handsfree function is used, the microphone audio is output from 
the speaker.
The breakdown judgment of the microphone can be done without 
connecting H/F with the cellular phone.

Procedure:
1.  Enter the test mode.
2.  Press the [

 

OFF SOURCE] button to select the Bluetooth 

Phone function.

3.  On/off of the microphone audio loopback function changes 

whenever the [ALBUM v

 

2] button is pressed (“ALBUM” is 

displayed in the liquid crystal display).

 

ON

Lit

OFF

None