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DTC B2871, DTC B2872 & DTC B2873:

WARNING: This page is about a different car, the 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure ignition is off. Disconnect left side impact sensor connector. Inspect both halves of connector for open circuit or pin slide-out. Repair as necessary. Disconnect air bag control module harness connector. Check air bag control module harness connector terminals No. 41 (Yellow/Green wire) and No. 42 (Green/Blue wire) for open circuit or pin slide-out. Repair as necessary and go to step  2. See Figure.
  2. Install air bag control module harness connector to Breakout Box (BOB). Measure resistance between BOB test pin No. 42 and Green/Blue wire of left side impact sensor harness connector. If resistance is 0-2 ohms, go to step  3. If resistance is not 0-2 ohms, repair or replace Green/Blue wire between air bag control module and side impact sensor. See WIRING DIAGRAMS . Go to step  6.
  3. Measure resistance between ground and BOB terminal No. 42. If resistance is infinite, go to step  4. If resistance is not infinite, repair or replace Green/Blue wire between air bag control module and side impact sensor. Go to step  6.
  4. Measure resistance between BOB terminal No. 41 and Yellow/Green wire of left side impact sensor harness connector. If resistance is 0-2 ohms, go to step  5. If resistance is not 0-2 ohms, repair or replace Yellow/Green wire between air bag control module and side impact sensor. Go to step  6.
  5. Measure resistance between ground and BOB terminal No. 41. If resistance is infinite, replace left side impact. Go to step  6. If resistance is not 0-2 ohms, repair or replace Yellow/Green wire between air bag control module and side impact sensor. Go to step  6.
  6. Reassemble vehicle. Clear diagnostic codes in all systems. Road test vehicle at various speeds and loads. Verify no diagnostic trouble codes are present. If no diagnostic trouble codes are present, repairs are complete. If diagnostic trouble codes are present, go to BEFORE REPLACING AIR BAG CONTROL MODULE  under DIAGNOSTICS.
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