Would be good to check the Cycle inhibit signal coming from the wash to the ACW4. Check the connections to ensure the signal is making it to the ACW.
Might also want to check the cycle synchronization switch:
SETTING THE CAR WASH CYCLE SYNCHRONIZATION SWITCH
The Car Wash Cycle Synchronization Switch is the silver toggle switch located on the Relay
Panel (Refer to Figure 3). The proper setting of this switch depends on the equipment used in
your car wash system. If the car wash equipment normally leaves the CYCLE/INHIBIT RELAY
de-energized while in stand-by, and then energizes the relay briefly when the customer exits
the bay, this switch should be set to PASSIVE. If the reverse occurs, where
the car wash equipment normally energizes the CYCLE/INHIBIT RELAY while in stand-by, then
de-energizes the relay briefly when the customer exits the bay, the switch should be set to
ACTIVE.