What are the steps to shutdown instance with ASM?

Hello,

Can one shutdown ASM instance before shutting the database instance using the ASM?

What are steps to do a clean shutdown of datase with ASM?

my scenario:

$ ps -ef|grep pmon

oragrid   14018	1  0 Aug11 ?	00:00:12 asm_pmon_+ASM1
s2sut1d1  18149	1  0 Aug11 ?	00:00:14 ora_pmon_s2sut1d11
oragrid  109433  94142  0 05:29 pts/0	00:00:00 grep pmon

When rebooting the script to shutdown the ASM hangs whith following in the log file:

User "oragrid' does not have privileges on instance "s2sut1d1"

Stop oracle instance : +ASM1

SHUTDOWN IMMEDIATE;

<<============AND HANGS HERE FOR EVER

Is the shutdown of the ASM hanging because the non asm instance was not shut down properly or at all?