When the UCH detects an abnormal voltage, resistance, or signal pattern from the physical door lock switch circuit—either because the switch is stuck, the wiring is damaged, or there’s a short circuit—it logs the code.
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Locating key safety elements like seat belt pretensioners, SRS control units, and the fuel tank (gasoline/ethanol compatible). Technical Context: The B1318 Fault Code When the UCH detects an abnormal voltage, resistance,