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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Supplemental Inflatable Restraint System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Pinpoint Tests - Air Bag Supplemental Restraint System (SRS) >> Pinpoint Test I: DTC B1891 - Air Bag Tone Warning Indicator Circuit Short to Battery >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The restraints control module (RCM) monitors its connection to the instrument cluster at pin 26. This connection is used to signal a chime if the air bag indicator is inoperative and another supplemental restraint system (SRS) fault exists. If the RCM detects a short to battery or ignition on the connection to the instrument cluster, it will store a diagnostic trouble code (DTC) B1891 in memory.

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