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Test H: DTC B2293 - Restraint System - Air Bag Fault

PINPOINT TEST H: DTC B2293 - RESTRAINT SYSTEM - AIR BAG FAULT


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Normal Operation
The restraints control module (RCM) monitors all front air bag module circuits for faults. The RCM will set a diagnostic trouble code (DTC) if a short to battery or short to ground fault is detected. The RCM will also set a DTC if the loop resistance is less than 0.9 ohm or greater than 5 ohms. The normal expected resistance range of driver air bag loop 1 and loop 2 is 1.47 to 4.26 ohms and 1.23 to 3.31 ohms for the passenger air bag loop 1 and loop 2. If a driver air bag loop resistance is between 0.9 and 1.47 or between 4.26 and 5 ohms and a passenger air bag loop resistance is between 0.9 and 1.23 or between 3.31 and 5 ohms, a DTC will not set but there exists a strong potential for an intermittent fault. If the RCM detects a fault on any of the front air bag circuits, it will store DTC B2293 in memory and send a message to the instrument cluster module to illuminate the air bag warning indicator.

Fault Conditions
The RCM monitors for the following fault conditions:
- Loop resistance less than 0.9 ohm (low resistance)
- Loop resistance greater than 5 ohms (circuit open)
- Circuit short to voltage
- Circuit short to ground

Possible Causes
A driver air bag fault can be caused by:
- damaged wiring, terminals or connectors.
- a faulty clockspring.
- a faulty driver air bag module.
- RCM is faulted.

A passenger air bag fault can be caused by:
- damaged wiring, terminals or connectors.
- a faulty passenger air bag module.
- RCM is faulted.