Samsung does not have the TS160 manual on their website, but does have the TS360. I will assume they are similar. From page 42 of that manual, here is the procedure for Autodetection of dish type. This SHOULD also help address any multiswitch issues, but there appears to be no specific reference to multiswitches in the manual.
"Using Auto Detection to set the dish type
To function properly, your DIRECTV® HD Receiver needs to know what type of satellite
dish you are using.
You can specify the dish type using the instructions on page 31, or you can follow the
steps below to use the Auto Detection menu item to automatically set the dish type.
Before you can use Auto Detection to set the dish-type, the dish must be correctly aligned and the DIRECTV® HD Receiver must be receiving a strong signal from the satellite (that is, signal-lock must be established).
To check the satellite signal, use the signal meter — see page 30 for details.
1 Press the MENU button on your remote control.
2 Highlight the Setup menu item, then press the SELECT button.
3 Highlight the Installation menu item, then press the SELECT button.
4 Highlight the Set Dish menu item, then press the SELECT button.
5 Highlight the Auto Detection menu item, then press the SELECT button.
The Auto Detection screen appears. The DIRECTV® HD Receiver starts attempting to identify the dish type. You can stop the detection process by using the arrow buttons on your remote control to highlight the on-screen Cancel button, then press the SELECT button.
Once the dish type has been identified, a screen appears telling you what type of satellite dish you have.
6 To accept the detected dish type setting, use the arrow buttons on your remote control to highlight the on-screen BACK button, then press the SELECT button. The DIRECTV® HD Receiver will reboot."
TS360 manual - check to see if it is markedly different from the TS160.
http://downloadcenter.samsung.com/content/UM/200401/20040108080124609_SIR-TS360.pdf