DTC 24/34 - Fasten Seatbelt Indicator Lamp

Circuit Description





The BCM provides a 12 volt output to the "Fasten Seatbelt" Indicator Lamp on the Instrument Cluster while the driver's seatbelt is unfastened (see Attachment 12).

DTC Will Set When

The "Fasten Seatbelt" output has been detected by the BCM to be shorted to ground, or shorted to B+ for greater than 50 milliseconds.

Action Taken

DTC 24 will set. The "Fasten Seatbelt" indicator lamp will not illuminate when ignition is "ON" and the driver's seatbelt is not fastened.

DTC Will Clear When

Fault is corrected and DTC memory clearing procedure is completed.

DTC Chart Test Description





Numbers below refer to the steps in the diagnostic table (see Attachment 13).

1. This step checks "Fasten Seatbelt" indicator for operation with BCM disconnected, which would reveal a short to B+ in circuit 237.

2. This step determines if there is a short to ground in the Instrument Cluster.

4. If the Instrument Cluster is OK, this step determines if circuit 237 is shorted to ground or the BCM is defective.

7. If there is a short to B+, this step determines if the short is in the Instrument Cluster or in circuit 237.

Diagnostic Aids

If the only DTC that flashes is a "History" code (DTC 34), the problem may be intermittent. Try performing the test shown while "wiggling" wiring and connectors; this can often cause the fault to appear. Check for poor connections at the BCM connector, which could cause an open or an intermittent fault. Refer to "Intermittent/History DTCs" near the beginning of this Section.