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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 420 (On-Board Diagnostic (Air Bag System - Two-Step Deployment Control System)) >> DTC B2445, U2018: Passenger-Side Air Bag Sensor (Internal Circuit Abnormal); Passenger-Side Air Bag Sensor (Communication Error) >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - DTC B2445, U2018

STEP INSPECTION ACTION
1 INSPECT PASSENGER-SIDE SIDE AIR BAG SENSOR CONNECTOR 
WARNING:
  • Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner front buckles, which may seriously injure you. Read the service warnings and cautions before handling the air bag system components.

    (See SERVICE WARNINGS .)

    (See SERVICE CAUTIONS .)

  • Turn the ignition switch to the LOCK position.
  • Disconnect the negative battery cable and wait for 1 min or more  .
  • Disconnect the passenger-side side air bag sensor connector.
  • Is there any malfunction of the passenger-side side air bag sensor connector?
 Yes Replace the air bag wiring harness.
No Go to the next step.
2 INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE SIDE AIR BAG SENSOR AND SAS CONTROL MODULE 
  • Turn the ignition switch to the LOCK position.
  • Disconnect the negative battery cable and wait for 1 min or more  .
  • Disconnect the driver and passenger-side front seat connectors.
  • Partially peel back the floor covering.
  • Disconnect the SAS control module connector.
  • Disconnect the passenger-side side air bag sensor connector.
  • Connect the negative battery cable.
  • Inspect the wiring harnesses between SAS control module terminal 2B and passenger-side side air bag sensor terminal A, SAS control module terminal 2C and passenger-side side air bag sensor terminal B for the following:
    • Short to ground
    • Short to power supply
    • Open circuit
  • Is the wiring harness normal?
 Yes Replace the passenger-side side air bag sensor, then go to the next step.
(See SIDE AIR BAG SENSOR REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM] .)
No Replace the air bag wiring harness.
3 INSPECT SAS CONTROL MODULE 
  • Turn the ignition switch to the LOCK position.
  • Disconnect the negative battery cable and wait for 1 min or more  .
  • Connect the SAS control module connector.
  • Connect the passenger-side side air bag sensor connector.
  • Are DTCs B2445 and/or U2018 indicated?
 Yes Present malfunction diagnosis: 
Past malfunction diagnosis: 
  • DTC troubleshooting completed.
No DTC troubleshooting completed.
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