Park Assist Sensor debug help needed

[07denaliyuk]

07 Denali, "service park assist" shows on DIC. Does anyone know how to find out which of the (4) sensors is bad? I suspect that one is bad. Is there a cleaning procedure?

Are they really $186?? or 45 on ebay??

Item 11 on the diagram

thanks for the help.

 

[ChrisAU]

Make sure that the plug behind the dash for the on/off switch for the parking sensors is plugged in well. Mine is somewhat loose (from taking my dash on and off multiple times while installing new headunit) and every now and then I will randomly get "PARK ASSIST OFF" on the DIC.

 

[bauer4567]

How did you ever make out with this??having the same problem right now...

 

[LABMAN]

How did you ever make out with this??having the same problem right now...

Me to