B1871

LFC 25 / DTC B1871 (Steps 1 - 3):

LFC 25 / DTC B1871 (Steps 4 - 7):

Normal Operation
The air bag diagnostic monitor monitors the status of the passenger air bag deactivation (PAD) switch at connector S-250 pin 8 (W/LB). The PAD switch signals the air bag diagnostic monitor by switching a resistance to ground. If the air bag diagnostic monitor senses 900-1100 ohms in the PAD switch, it enables the passenger-side air bag and turns off the PAD switch warning lamp. If the air bag diagnostic monitor senses 400-600 Ohms in the PAD switch, it deactivates the passenger-side air bag and turns the PAD switch warning lamp on. If the air bag diagnostic monitor detects an invalid resistance, it will store a diagnostic trouble code (DTC) B1871 in memory and flash a lamp fault code (LFC) 25 (or higher priority code if one exists) on the air bag indicator.

Possible Causes
- A damaged or inoperative PAD switch.
- A damaged or inoperative air bag diagnostic monitor.
- A short to battery, short to ground or open on (W/LB) wire.