B1820 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1820 – Driver Seat Recline Rearward Switch Circuit Short To Battery
B1820 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B1820 Possible Causes
Faulty Seat Adjuster Switch,Seat Adjuster Switch harness is open or shorted,Seat Adjuster Switch circuit poor electrical connection,Faulty Memory Seat Module (MSM)
When the power seat switches are pressed, they send a 12-volt signal through the switch signal circuits to the Memory Seat Module (MSM). The MSM then commands the driver seat motors to move in response to the switch signals. If a seat switch circuit is active in one direction and the switch for the opposite direction is pressed, this Diagnostic Trouble Code (DTC) will set. Multiple DTCs will set if one of the switch signal circuits is shorted to voltage.