Test D

PINPOINT TEST D: LFC 25/DTC B1871 - PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH FAULT

Test D1-D2:

Test D3-D5:

Test D5-D6:

Test D7:

Normal Operation
The restraints control module (RCM) monitors the status of the passenger air bag deactivation (PAD) switch at pin C2041-8, circuit 1112 (W/LB). The PAD switch signals the RCM by switching a resistance to ground. If the RCM senses 900-1100 ohms in the PAD switch, it enables the passenger air bag and turns off the PAD switch warning lamp. If the RCM senses 400-600 ohms in the PAD switch, it deactivates the passenger air bag and turns the PAD switch warning lamp on. If the RCM 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 PAD switch fault could be caused by:
- a damaged or inoperative PAD switch.
- a damaged or inoperative RCM module.
- a short to battery, short to ground or open on circuit 1112 (W/LB).
- an incorrectly configured RCM.