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B279A TOYOTA - Deterrent System Communication

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Faulty Key
  • Faulty Transponder Key Electronic Control Unit (ECU)
  • Transponder Key Electronic Control Unit harness is open or shorted
  • Transponder Key Electronic Control Unit circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
What does this mean?
OBDII Code B279a Toyota - Deterrent System Communication -

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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Posted and Edit by 01-25-2017