Engine-Codes - Mercury - B1891 Mercury

B1891 Mercury Code - Air Bag Tone Warning Indicator Circuit Short to Battery

- Code Popularity: 462 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B1891 Mercury?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Instrument Cluster Module
  • Instrument Cluster Module harness is open or shorted
  • Instrument Cluster Module circuit poor electrical connection
  • Faulty Restraints Control Module (RCM)
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How to Fix the DTC B1891 Mercury?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B1891 Mercury code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Air Bag Warning Light ON

What Does the B1891 Mercury Code Mean?

The connection between the Instrument Cluster Module and Restraints Control Module (RCM) is used to signal a chime if the primary air bag indicator is inoperative and another Supplemental Restraint System (SRS) fault exists. The RCM monitors this connection to the Instrument Cluster Module. If the RCM detects a circuit failure on the connection to the cluster, it will store diagnostic trouble code (DTC) B1891 in memory and flash lamp on the air bag indicator.

B1891 Mercury Code - Air Bag Tone Warning Indicator Circuit Short to Battery

Need more Information on the Code?

Need more information on how to fix the B1891 Mercury code? Get Access to Factory Service Manuals

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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.