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 MANUALSSAAB20009-3 CONVERTIBLE (9400) L4-2.0L TURBO (B205)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDATA LINK CONNECTORDESCRIPTION AND OPERATION
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)
Data Link Connector: Description and Operation
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)SECTION Description and Operation
Diagnostic data link
The ABS control module is not connected to a bus. Diagnostic communication takes place over a lead from pin 11 of the ABS control module to pin 8 of the data link connector (diagnostic socket) and from there direct to the diagnostic tool.
The diagnostic tool communicates digitally and serially with the ABS. Digitally means that the difference in voltage between the lead and ground has two values, in this case about 0 V and B+. The information is coded so that different combinations of 0 V and B+ pulses have different meanings.
Serially means that the information is sent in "packets" one after the other in very quick succession.
Diagnosis
If the system cannot be contacted, the fault could be either in the car or in the diagnostic tool. If the diagnostic tool can contact the same system in another car, then the fault is lies with the car.
First check that the control module is active; ABS warning lamps are tested by the control module as soon as the ignition is switched on. If the control module is active, the fault is probably to be found in the lead between the data link connector (diagnostic socket) and the control module.
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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.