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DTC 25: Left Side Air Bag Sensor Communication Error

WARNING: This page is about a different car, the 2002 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Disconnect left side air bag sensor connector. See SIDE AIR BAG SENSOR  under REMOVAL & INSTALLATION. Check White wire between SAS control module connector 3B and left side air bag sensor connector terminal "A" for short to ground, short to power and open circuit. See Figure & Figure . Check Brown wire between SAS control module connector 3D and left side air bag sensor connector terminal "B" for short to ground, short to power and open circuit.
  2. Check White/Red wire between SAS control module connector 3F and left side air bag sensor connector terminal "C" for short to ground, short to power and open circuit. Check Blue wire between SAS control module connector 3E and left side air bag sensor connector terminal "D" for short to ground, short to power and open circuit. If wiring is okay and this is present DTC, go to next step. If wiring is okay and this is past DTC, replace left side air bag sensor. Go to step  5. If wiring is defective, replace wiring harness. Go to step  5.
  3. Measure resistance between left side air bag sensor terminals "C" and "D". See Figure. If resistance is about 1000 ohms, replace SAS control module. See SAS CONTROL MODULE  under REMOVAL & INSTALLATION. Go to next step. If resistance is not about 1000 ohms, replace left side air bag sensor. Go to step  5.
  4. Reconnect all connectors. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Turn ignition on and check DTC. If DTC 25 is displayed, replace left side air bag sensor. Go to next step. If DTC 25 is not displayed, test is complete. Go to next step.
  5. Reconnect all connectors. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Perform SYSTEM OPERATION CHECK . Ensure AIR BAG warning light is operating properly. If not, reconfirm malfunction symptoms.
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