Test U: DTC B2439 - Passenger Safety Belt Buckle Switch Circuit Resistance Out of Range

PINPOINT TEST U: DTC B2439 - PASSENGER SAFETY BELT BUCKLE SWITCH CIRCUIT RESISTANCE OUT OF RANGE

U1-U2:

U2-U4:

Lamp Fault Codes (LFCs)







The lamp fault code (LFC) indicates the specific fault associated with diagnostic trouble code (DTC) B2439.

Normal Operation
As part of the SRS, the safety belt buckles are equipped with Hall-effect switches. The safety belt switches indicate to the restraints control module (RCM) whether the safety belts are connected or disconnected.

The RCM checks the passenger safety belt buckle switch circuits for faults. If the RCM detects a current out of range fault, it will store diagnostic trouble code (DTC) B2439 in memory and flash lamp fault code (LFC) 7-6 on the air bag indicator.

Possible Causes
A passenger safety belt buckle switch current out of range fault can be caused by:
- wiring, terminals or connectors
- a faulted passenger safety belt buckle switch
- a faulted RCM