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Home >> Mazda >> 2007 >> B3000 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 483 (On-Board Diagnostic (Air Bag System - Two-Step Deployment Control System)) >> DTC B1869, DTC B1870: Air Bag System Warning Light Circuit Open; Air Bag System Warning Light Circuit Short To Body Ground >> 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 B1869, B1870

STEP INSPECTION ACTION
1 INSPECT METER 10 A FUSE 
  • Turn ignition switch to LOCK position.
  • Disconnect negative battery cable.
  • Remove the METER 10 A fuse.
  • Is the fuse normal?
 Yes Install the fuse, then go to the next step.
No Replace the METER 10 A fuse.
2 INSPECT FOR CONTINUITY BETWEEN METER 10 A FUSE AND INSTRUMENT CLUSTER 
  • Connect negative battery cable.
  • Turn the ignition switch to the ON position.
  • Measure the voltage at instrument cluster connector terminal 3J.
  • Is the voltage 9 V or more? 
 Yes Go to the next step.
No Repair the related wiring harness.
3 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 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 3R 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 3R 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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