9-5 Sport Wagon (9600) V6-3.0L Turbo (B308) (2003)
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System Relay: Description and Operation
A/C Relay
When the A/C compressor is activated from the ACC or MCC and all other condition have been fulfilled, DICE will send bus information "A/C ON".
The value is used by Trionic T7.
The control module then calculates the impending torque requirement of the compressor on the basis of the A/C pressure and then requests a
corresponding increase in the air mass/combustion. After a short delay the control module grounds pin 4, which is connected to the A/C relay.
The control module activates the relay only after the engine has started.
Diagnostics
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Diagnostic trouble code P1656 will be generated in the event of a break or short-circuit to ground.
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Diagnostic trouble code P1657 will be generated in the event of a short-circuit to B+.
