B1678

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 Smart key Module is located inside of instrument panel, left knee of driver side.
It consists of ESCL control Module, Smart key 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 Smart key Module -> 3.PDM supplies power supply to ESCL -> 4.SMART KEY 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

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

DTC Detecting Condition






Diagnostic Circuit Diagram






Monitor Scantool data

Check DTC status
1. Check DTC on PDM side with scantool.
2. Check that there is any DTC on PDM side or ESCL side.
3. Inspect DTC related ESCL first if there is any DTC on the PDM side according to DTC troubleshooting guide.
4. After inspection and repair, erase DTC related ESCL.
5. Erase DTC B1971 ESCL failure on Smart key Module side.
6. Has the DTC gone after erasing DTC with scantool ?






Check current Data
1. Select current data parameters related Smart key Module with scantool.
2. Monitor "ESCL ENABLE" and "SMK State" are normal.
3. Select current data parameter related PDM.
4. Monitor "ESCL BATTERY OUTPUT" , "ESCL GND OUTPUT" and "ESCL UNLOCK STATE INPUT" are normal.

Specification :- Current Data parameter related Smart key Module -
1.ESCL ENABLE : It is ON, if IPM sends enable signal to ESCL
2.SMK State : It shows ESCL current status. It shows ESCL FAILURE if there is a failure







Specification :- Current Data parameter related PDM -
1.ESCL BATTERY OUTPUT : It will be changed form OFF to ON when PDM supplies operation voltage with PDM.
2.ESCL GND OUTPUT : It will be changed form OFF to ON when PDM supplies operation voltage with PDM.
3.ESCL UNLOCK STATE INPUT : In case that ESCL bolts is unlock, it will be ON.






5. Are all parameters related ESCL functioning normally ?






Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration,or damage.
3. Has a problem been found?






Check ESCL circuit

Check short to ground in ESCL circuit.
1. IG KEY OFF
2. Disconnect ESCL control Module, PDM and Smart key Module connector.
3. Measure resistance between all the terminals of ESCL harness connector and chassis ground.

Specification :Infinite

4. Is the measured resistance within specification ?






Check short to battery in ESCL harness
1. IG KEY OFF.
2. Disconnect ESCL control Module, PDM and SMART KEY Module connector.
3. Measure resistance between each terminal of ESCL control Module harness connector and chassis ground.

Specification :About 0V

4. Is the measured voltage within specification ?






Check open in ESCL harness
1. IG KEY OFF.
2. Disconnect ESCL control Module, PDM and Smart key Module connector.
3. Measure resistance between one and the other terminal of ESCL control module harness connector or IPM harness connector.

Specification :About below 1Ohms

4. Is the measured resistance within specification ?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scantool.
3. Are any DTCs present?