Before replacing the ECU,
ensure that the communication circuit is normal.
DIAGNOSIS FUNCTION
If an open circuit or short to earth occurs in the key slot, KOS&OSS-ECU sets
diagnosis code No. B2352.
JUDGEMENT CRITERIA
When the key slot and the KOS&OSS-ECU are communicating, the KOS&OSS-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&OSS-ECU detects open circuit or short circuit to earth
consecutively four times during the operation above, the ECU will set this diagnosis code.
PROBABLE CAUSES
Malfunction of the key slot
Damaged wiring harness and connectors
Malfunction of KOS&OSS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Key slot check
Check that the key slot is normal (Refer to ).
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&OSS-ECU connector
Q.
Is the check result normal?
Go to Step 3.
Repair the wiring harness.
STEP 3. Check whether the diagnosis code is set again.
(1)Open and close the driver’s door several times.
(2)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace KOS&OSS-ECU and register the ID codes (Refer to ).