OBDII Code List

B1879 MERCURY - Seat Belt Driver Pretensioner Circuit Short To Ground

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Seat Belt Driver Pretensioner
  • Seat Belt Driver Pretensioner harness is open or shorted
  • Seat Belt Driver Pretensioner circuit poor electrical connection
  • Faulty Restraints Control Module (RCM)

Possible symptoms

  • Air Bag Warning Light ON

B1879 Mercury Description

The Restraints Control Module (RCM) checks all of the safety Seat Belt Pretensioners for faults. If the RCM detects a short to ground on a Driver Safety Seat Belt Pretensioner circuit, it will store diagnostic trouble code (DTC) B1879 in memory and illuminate the air bag warning indicator.
OBDII Code B1879 Mercury - Seat Belt Driver Pretensioner Circuit Short To Ground -

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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