Code No.B2352 Antenna fail

caution Before replacing the ECU, ensure that the communication circuit is normal.


If an open circuit or short to earth occurs in the key slot, KOS-ECU sets the diagnosis code No. B2352.


When the engine switch power supply mode is set from OFF to ON or the driver’s door is opened with the engine switch power supply mode at OFF after the battery-discharged keyless operation key is inserted into the key slot, the KOS-ECU will send a signal to the key slot. Then the key slot will send a code to the keyless operation key via its antenna. If the KOS-ECU detects open circuit or short circuit to earth consecutively four times during the operation above, the ECU will set this diagnosis code.



STEP 1. Key slot check

Check that the key slot is normal (Refer to Inspection ).

Q. Is the check result normal?

Go to Step 2

Replace the key slot.

STEP 2. Check of short to power supply, short to earth, and open circuit in ANTP, ANTG line between the key slot connector and the KOS-ECU connector.

Q. Is the check result normal?

Go to Step 3

Repair the wiring harness.

STEP 3. Check whether the diagnosis code is reset.

(1)Open the driver’s door.
(2)Turn the power supply mode of the engine switch from OFF to ON.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace KOS-ECU and register the ID codes (Refer to ).

The diagnosis is complete.