B1A82 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1A82 – External Trip Switch

 

B1A82 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B1A82 Possible Causes

 

Faulty Message Center Switch (Part of the LH Steering Wheel switch),Message Center Switch harness is open or shorted,Message Center Switch circuit poor electrical connection,Faulty Clockspring,Faulty Instrument Panel Cluster (IPC)

 

B1A82 Description

 

The message center functionality is controlled through the message center switch (part of the LH steering wheel switch), which is hardwired to the Instrument Panel Cluster (IPC) through input and return circuits. There are 3 message center switch buttons (base IPC ) or 5 message center switch buttons (optional IPC ). Each button operates a unique switch within the message center switch portion of the LH steering wheel switch assembly using a different resistance value associated with each specific button. The IPC sends out a reference voltage to the LH steering wheel switch on the input circuit and monitors the voltage drop when a message center switch button is pressed. The voltage drop varies depending upon the resistance of the specific button pressed, providing indication to the IPC , which switch is pressed.