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 DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONP CODE CHARTSP1577DIAGNOSTIC PROCEDURESCHECKING THE CONTROL MODULE BRAKE LIGHT INPUT
2003 Saab 9-3 Convertible (9400) L4-2.0L Turbo (2.0 HOT)
Checking the Control Module Brake Light Input
2003 Saab 9-3 Convertible (9400) L4-2.0L Turbo (2.0 HOT)SECTION Checking the Control Module Brake Light Input
Checking The Control Module Brake Light Input
- Turn the ignition switch to the ON position
- Contact Trionic.
- Read value: Brake Light (Trionic).
- The reading should be ON when the brake pedal is depressed and OFF when the brake pedal is released.
Is the function correct?
NO - Changing Components
YES - Remedial Action OK
RENDER: 1.0x
NO RELATED
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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.