Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB20039-3 CONVERTIBLE (9400) L4-2.0L TURBO (2.0 HOT)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGSYSTEM RELAYDESCRIPTION AND OPERATION
2003 Saab 9-3 Convertible (9400) L4-2.0L Turbo (2.0 HOT)
System Relay: Description and Operation
2003 Saab 9-3 Convertible (9400) L4-2.0L Turbo (2.0 HOT)SECTION 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 based on the A/C pressure and subsequently requests a corresponding increase in the air mass/combustion. After a short delay, the control module will ground pin 4, which is connected to the A/C relay.
The control module activates the relay only after the engine has started.
Diagnostics
- If there is an open circuit or short circuit to ground, diagnostic trouble code P1656 will be generated.
- If there is a short circuit to B+, diagnostic trouble code P1657 will be generated.
NOTE: The A/C request from DICE can be read with the diagnostic tool.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.