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DTC B1605 - Control Module Internal Fault

WARNING: This page is about a different car, the 1996 Saab 9000. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Clear DTCs and turn ignition off. Turn ignition on and wait 10 seconds, then observe SRS warning light. If DTC B1605 reappears, go to next step. If DTC B1605 does not reappear, no other action is required. A possible cause for DTC B1605 setting is vehicle system voltage dropping below 7 volts. Ensure vehicle is in proper working order.
  2. Replace SRS control module. After installing new SRS control module, clear DTCs and turn ignition off. Ensure vehicle is in proper working order.
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