B2253 BUICK – Right Key Cylinder Switch Fault

B2253 BUICK Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

B2253 BUICK Possible Causes

Faulty Right Key Cylinder Switch,Right Key Cylinder Switch harness is open or shorted,Right Key Cylinder Switch circuit poor electrical connection,Faulty Passenger Door Module (PDM)

B2253 BUICK Description

The driver or passenger door key switch signal circuits provide input to the Driver Door Module (DDM) or Passenger Door Module (PDM) when the driver or passenger door lock cylinder is rotated to the UNLOCK position. This input allows the door module to detect a door UNLOCK request. The door module provides power and ground to the door key switch. When the door lock cylinder is rotated to the UNLOCK position, a ground is supplied through the door key switch to the signal circuit, which is pulled low. When the DDM detects low voltage on the driver door key switch signal circuit, it sends a message on the serial data line to the PDM to UNLOCK the passenger door. When the PDM detects low voltage on the passenger door key switch signal circuit, it sends a message on the serial data line to the DDM to UNLOCK the driver door. The messages sent on the serial data line are also used by other systems to execute certain functions. The DDM and PDM monitor the signal circuits to determine how long the ground has been applied. If the DDM or PDM detects that the ground is applied for greater than 20 seconds, a Diagnostic Trouble Code (DTC) is set.