Prelude L4-1958cc DOHC (1989)
A/C Compressor Control Unit: Description and Operation
Compressor Control System Description
The compressor control unit has a system designed to protect the compressor belt in the event of a seizure, thereby allowing the alternator to continue
operating.
This is done by comparing the engine rpm and the compressor pulley rpm. When there is a difference in rpm that continues for more than 3 seconds,
the compressor relays are turned off and the warning light comes on.
To reset, push the A/C switch off, then push it on again.
NOTE: If the switch is pushed off and on more than twice, it will be necessary to turn off the ignition to reset.
