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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 471 (On-Board Diagnostic (Air Bag System)) >> DTC B1869, B1870: Malfunction in the air bag system warning light circuit >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1869, B1870 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT FOR CONTINUITY BETWEEN BATTERY FUSE AND INSTRUMENT CLUSTER 
  • Turn the ignition switch to the ON position.
  • Measure the voltage at instrument cluster connector terminal 2K.
  • Is the voltage 9 V or more? 
 Yes Go to the next step.
No Repair the related wiring harness.
2 INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND SAS CONTROL MODULE 
WARNING:
  • Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, 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. 
  • Remove the column cover.
  • Disconnect the clock spring connector.
  • Remove the glove compartment.
  • Disconnect the passenger-side air bag module connector.
  • Disconnect the driver and passenger-side curtain air bag module connectors.
  • Disconnect the driver and passenger-side side air bag module connectors.
  • Remove the rear door lower trim.
  • Disconnect the driver and passenger-side pre-tensioner seat belt connectors.
  • Partially peel back the floor covering.
  • Disconnect the SAS control module connector.
  • Disconnect the instrument cluster connector.
  • Inspect the wiring harness between SAS control module terminal 1T and instrument cluster terminal 2K for the following:
    • Short to ground
    • Short to power supply
    • Open circuit
  • Is the wiring harness normal?
 Yes Go to the next step.
No Replace the air bag wiring harness.
4 INSPECT AIR BAG SYSTEM WARNING LIGHT 
  • Connect the instrument cluster connector.
  • Turn the ignition switch to the ON position.
  • Does the air bag system warning light illuminate?
 Yes Go to the next step.
No Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
5 INSPECT AIR BAG SYSTEM WARNING LIGHT 
  • Ground instrument cluster connector terminal 2K to the body using a jumper wire.
  • Does the air bag system warning light go out?
 Yes [Present malfunction diagnosis] 
[Past malfunction diagnosis] 
  • DTC troubleshooting completed.
No Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
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