Code No. B1646: Coding data mismatch
caution
If diagnosis code No. B1646 is set, diagnose the CAN bus lines.
When replacing the ECU, always check that the communication circuit is normal.
FUNCTION
If a false coding data is written in the SRS-ECU, the SRS-ECU will set diagnosis code No. B1646.
TROUBLE JUDGEMENT
When correct coding data is not received from ETACS-ECU, SRS-ECU will determine that the a problem has occurred.
PROBABLE CAUSES
Malfunction of CAN bus line
Malfunction of ETACS-ECU
Malfunction of SRS-ECU
DIAGNOSIS PROCEDURE
1.
M.U.T.-III CAN bus diagnostics
2.
M.U.T.-III other system diagnosis code
3.
Check whether the diagnosis code is reset.