Toyota Prius 2010 Repair Manual page 45

(2) Operate the remote A/C switch on key (electrical transmitter) A and check that the remote air conditioning
system can be operated.
(3) Operate the remote A/C switch on key (electrical transmitter) B and check that the remote air conditioning
system can be operated.
HINT:
If the remote air conditioning system is not operated for both keys (electrical transmitters) A and B, the
remote air conditioning system may have a malfunction
If the remote air conditioning system is not operated for one of the keys (electrical transmitter) A or B,
the key (electrical transmitter) needs to be replaced because a malfunction of the remote A/C switch on
the key (electrical transmitter) is suspected.
2010 Toyota Prius
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Repair Manual