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-U4:

Lamp Fault Codes (LFCs)







The lamp fault code (LFC) indicate 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 DTC B2439 in memory, flash LFC 7-6 on the air bag indicator and the secondary air bag warning chime will be activated.

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.