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DTC B1A08 Keyless/KOS key1 performance
DTC B1A09 Keyless/KOS key2 performance
DTC B1A0A Keyless/KOS key3 performance
DTC B1A0B Keyless/KOS key4 performance
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
If KOS&OSS-ECU receives wrong signal from the keyless operation key, KOS&OSS-ECU memorizes DTC B1A08, B1A09, B1A0A or B1A0B.
 
 
PROBABLE CAUSES
  • Malfunction of the keyless operation key
  • Malfunction of the KOS&OSS-ECU
 
 
DIAGNOSIS
STEP 1. Operate the keyless operation key, and recheck the DTC.
(1) Operate the keyless operation key as follows:
  • Push the lock switch or unlock switch of keyless operation key five times or more.
  • When the keyless entry function does not work after performing the above procedure, register the key again (Refer to ).
(2) Push the lock switch or unlock switch of keyless operation key.
(3) Check if the DTC is set.
Is the DTC set?
Perform troubleshooting if KOS&OSS-ECU DTC except No.B1A10, B1A11, B1A12 or B1A13 is set. Then go to Step 2.
The diagnosis is complete.
 
STEP 2. Check whether the DTC is set again.
Replace the keyless operation key for which the DTC is set with a new one, register the key (Refer to ), and then check whether the DTC is set again.
(1) Push the lock switch or unlock switch of keyless operation key.
(2) Check if the DTC is set.
Is the DTC set?
Replace KOS&OSS-ECU and register the ID codes (Refer to ).
The diagnosis is complete.