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 MANUALSSAAB19999-3 BASE, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSANTI-THEFT SYSTEMSDIAGNOSTIC TESTSDTC B2385: TRANSPONDER KEY INVALID
1999 Saab 9-3 Base, 2D Hatchback, Automatic
DTC B2385: Transponder Key Invalid
1999 Saab 9-3 Base, 2D Hatchback, AutomaticSECTION DTC B2385: Transponder Key Invalid
- If vehicle will start with one key but not with another key, key needs to be reprogrammed. Key can only be programmed using Saab diagnostic scan tool. If vehicle will not start with any key, disconnect 4-pin connector at ignition switch antenna unit. See Fig 1 . Turn ignition on. Connect test light between antenna unit 4-pin connector terminal No. 1 (Green wire) and ground. If test light comes on, go to next step. If test light does not come on, repair open circuit in Green wire. Go to step 7 .
- Turn ignition off. Disconnect TWICE module connector. TWICE module is located under driver's seat. Measure continuity between antenna unit connector terminal No. 2 (Yellow/Brown wire) and TWICE module connector terminal No. 39 (Yellow/Brown wire). If continuity is present, go to next step. If continuity is not present, repair open circuit in Yellow/Brown wire. Go to step 7 .
- Turn ignition on. Measure voltage between antenna unit connector terminal No. 2 (Yellow/Brown wire) and TWICE module connector terminal No. 39 (Yellow/Brown wire). If voltage is one volt or less, go to next step. If voltage is greater than one volt, repair short circuit in Yellow/Brown wire. Go to step 7 .
- Turn ignition off. Measure continuity between antenna unit connector terminal No. 2 (Yellow/Brown wire) and TWICE module connector terminal No. 39 (Yellow/Brown wire). If continuity is present, go to next step. If continuity is not present, repair open circuit in Yellow/Brown wire. Go to step 7 .
- Measure continuity between antenna unit connector terminal No. 3 (Black wire) and ground. If continuity is present, go to next step. If continuity is not present, repair open circuit in Black ground wire. Go to step 7 .
- Turn ignition on. Measure voltage between antenna unit connector terminal No. 3 (Black wire) and ground. If voltage is one volt or less, replace antenna unit. If voltage is greater than one volt, repair open circuit in Black wire. Go to step 7 .
- Clear all DTCs. If DTC reoccurs, replace TWICE 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.