Code No.B240D Front antenna(indoor) open



caution When replacing the ECU, always check that the communication circuit is normal.


DIAGNOSTIC FUNCTION




JUDGMENT CRITERIA




PROBABLE CAUSES



  • Malfunction of the inside transmission antenna assembly (front)
  • Malfunction of the KOS-ECU
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check of short to power supply, short to earth, and open circuit in INFP, INFG line between the inside transmission antenna assembly (front) connector and the KOS-ECU connector.


Q. Is the check result normal?





STEP 2. Keyless operation system communication test



Antennas to be checked
    Front antenna (indoor)
OK: Normal is displayed.

Q. Is the check result normal?





STEP 3. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the power supply mode of the engine switch from OFF to ON.
(3)Check if the diagnosis code is set.
(4)Turn the power supply mode of the engine switch from OFF to ON.

Q. Is the diagnosis code set?