Test U

PINPOINT TEST U: LFC 42/DTC B2227 - FRONT IMPACT SEVERITY SENSOR COMMUNICATION FAULT

Test U1-U2:

Test U2-U5:

Test U5-U6:

Test U7-U8:

Test U9-U12:

Test U13:

Normal Operation
The front impact severity sensor provides data to the RCM for use in calculating impact severity. The front impact severity sensor is used by the RCM as an input for deployment determination.

The RCM checks the impact sensor circuits for faults. If the RCM detects a fault on either of the front impact severity impact sensor circuits, it will store diagnostic trouble code (DTC) B2227 in memory and flash lamp fault code (LFC) 42 (or higher priority code if one exists) on the air bag indicator.

Fault Conditions
The RCM monitors for the following fault conditions:
- low resistance.
- high resistance or circuit open.
- circuit short to voltage.
- circuit short to ground.

Possible Causes
A impact sensor fault can be caused by:
- faulted wiring, terminals, or connectors.
- a faulted impact sensor.
- incorrect sensor mounting.
- a faulted RCM.