Normal Operation

The Driver Seat Module (DSM) controls the output of several vehicle systems by means of solid state drivers. When an overload occurs on any of these drivers, a DTC sets. The module also tracks the number of repetitive faults on each of these circuits. The module compares this number of overloads to 3 progressive thresholds established for each circuit. If the 3 thresholds have not been exceeded, then the DTC of the affected circuit can be cleared by eliminating the fault, clearing the DTCs and running the self-test. At the point that each of the first 2 thresholds are exceeded, DTC B106E sets along with the DTC relating to the affected circuit. Once the final threshold has been exceeded, the affected output is permanently disabled, and DTC B106F sets along with DTC B1342, at which time the DSM  must be replaced.

• DTC B106E (Solid State Driver Disabled Due To Short Circuit) - sets when the DSM  has disabled a circuit due to a repetitive fault causing a circuit overload. A corresponding DTC for the circuit in question also sets.
• DTC B106F (Module Disabled Due to External Fault) - sets when one or more output functions are permanently disabled due to a repetitive circuit overload fault. DTC B106F sets with DTC B1342. When DTC B106F is present, a new DSM  must be installed after the fault condition has been corrected.

This pinpoint test is intended to diagnose the following: 

• Output circuit short to ground or voltage
• DSM