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DTC B241A: ESL power control circuit earth
DTC B241B: ESL power control circuit open
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
 
 
DTC SET CONDITION
B241A
  • When a short to ground occurs in the wiring harness between the electrical steering lock and KOS-ECU, KOS-ECU sets the DTC B241A.
B241B
  • When an open circuit or short to power supply occurs in the wiring harness between the electrical steering lock and KOS-ECU, KOS-ECU sets the DTC B241B.
 
 
TECHNICAL DESCRIPTION (COMMENT)
B241A
  • When a short to ground occurs in the wiring harness, KOS-ECU determines that a problem has occurred.
B241B
  • When an open circuit or short to power supply occurs in the wiring harness, KOS-ECU determines that a problem has occurred.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the electronic steering lock
  • Malfunction of the KOS-ECU
  • Damaged wiring harness and connectors
 
 
DIAGNOSIS
Required Special Tools:
  • MB992006: Extra fine probe
  • MB991223: Harness set
STEP 1. Check KOS-ECU connector C-08 and electronic steering lock connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are KOS-ECU connector C-08 and electronic steering lock connector C-311 in good condition?
Go to Step 2.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . Check that the electronic steering lock works normally.
 
STEP 2. Check the wiring harness between KOS-ECU connector C-08 (terminal No. 23) and electronic steering lock connector C-311 (terminal No. 3), between KOS-ECU connector C-08 (terminal No. 23) and OSS-ECU connector C-14 (terminal No. 21).
  • Check the wiring harness for short circuit and open circuit.
Are the wiring harness between KOS-ECU connector C-08 (terminal No. 23) and electronic steering lock connector C-311 (terminal No. 3), between KOS-ECU connector C-08 (terminal No. 23) and OSS-ECU connector C-14 (terminal No. 21) in good condition?
Go to Step 3.
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the electronic steering lock works normally.
 
STEP 3. Measure the voltage at electronic steering lock connector C-311.
(1) Disconnect electronic steering lock C-311 and measure the voltage available at the wiring harness side of the connector.
(2) Open the driver's door.
(3) Measure the voltage between terminal No. 3 and ground.
  • The voltage should measure approximately 12 volts (battery positive voltage).
Is the measured voltage approximately 12 volts (battery positive voltage)?
Go to Step 4.
Replace the electronic steering lock. Go to Step 4.
 
STEP 4. Check whether the diagnostic trouble code is reset.
(1) Erase the diagnostic trouble code.
(2) Turn the power supply mode of the engine switch from OFF to ON.
(3) Check if the diagnostic trouble code is set.
Is the diagnostic trouble code set?
Replace KOS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).