Tests AE: LFC 46/DTC B1877 or B1885 - Driver Pretensioner Circuit Open/Driver Pretensioner Circuit Resistance Lo

AE1:

AE2:

AE3 - AE4:

AE4 - AE5:

AE5 - AE7:

AE7 - AE8:

AE9:

Normal Operation
The Restraints Control Module (RCM) monitors the driver safety belt pretensioner circuit loop at RCM C310b pins 15 and 16, circuits 1079 (LG/RD) and 1080 (LG/BK). If the RCM detects a high resistance, (greater than 3.7 ohms), it will set Diagnostic Trouble Code (DTC) B1877. If it detects a low resistance (less than 0.7 ohm) it will store B1885 in memory and flash Lamp Fault Code (LFC) 46 (or higher priority code if one exists) on the air bag indicator.

Possible Causes
A driver safety belt pretensioner circuit open or low resistance can be caused by:
^ an open or high resistance on circuit 1079 (LG/RD) or 1080 (LG/BK).
^ circuits 1079 (LG/RD) and 1080 (LG/BK) shorted together.
^ a driver safety belt pretensioner internal fault.
^ an RCM internal fault.