General Information

Smart Key Unit
B1978 Electric Steering Column Lock Failure - General Information

Component Location





General Description

ESCL(Electronic Steering Column Lock) is a system to control the lock or unlock of the Steering Column.
It is installed on steering column and Smartkey Module is located inside of instrument panel, left knee of driver side.
It consists of ESCL control Module, Smartkey Module, PDM and SSB(engine Start Stop Button)
It is operating as follows
1.Pushing SSB -> 2. Switch 1 signal goes to PDM, Switch 2 signal goes to Smartkey Module -> 3.PDM supplies power supply to ESCL -> 4.SMARTKEY Module sends ENABLE signal and operation signal to ESCL -> 5.ESCL controls bolt to lock or unlock ESCL -> 6.PDM detects ESCL Unlock signal.

DTC Description

Smartkey Module receives ESCL lock or unlock stuatus signal from ESCL and PDM(via CAN). And then, Smartkey Module compares PDM is lock or unlock signal with ESCL is lock or unlock signal.
If the both signals are unmathing, Smartkey Module sets DTC B1971.

DTC Detecting Condition





Diagnostic Circuit Diagram