Normal Operation
WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition is in the ON position, the passenger air bag deactivation (PAD) indicator prove-out period is initiated by the restraints control module (RCM). The RCM briefly activates the PAD indicator to verify to the occupants correct functional operation of the PAD indicator. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) .
If the RCM detects a short to battery on the PAD indicator circuit, it will store diagnostic trouble code (DTC) B1890 in memory and send a message to the instrument cluster module to illuminate the air bag warning indicator.
- DTC B1890 PAD Warning Lamp Circuit Short to Battery - If the RCM detects a short to battery on the PAD indicator circuit, it will set this DTC.
This pinpoint test is intended to diagnose the following:
- Damaged wiring, terminals or connectors
- Faulted PAD indicator
- Faulted RCM