Test U

PINPOINT TEST U: DTC B2438 - PASSENGER SAFETY BELT BUCKLE SWITCH CIRCUIT SHORT TO GROUND

Lamp Fault Codes (LFCs)







The lamp fault code (LFC) indicates the specific fault associated with diagnostic trouble code (DTC) B2438.

Test U1:

Test U2:

Test U2-U4:

Test U5:

Test U6:

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

The restraints control module (RCM) checks the passenger safety belt buckle switch circuits for faults. If the RCM detects a short to ground fault, it will store diagnostic trouble code (DTC) B2438 in memory and flash lamp fault code (LFC) 7-2 on the air bag indicator.

Possible Causes
A passenger safety belt buckle switch short to ground circuit fault can be caused by:
- wiring, terminals, or connectors.
- a faulty passenger safety belt buckle switch.
- a faulted RCM.