DTC B1646: Coding data mismatch
caution
If DTC 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 DTC B1646.
TROUBLE JUDGMENT
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
1.
Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
2.
Using scan tool (M.U.T.-IIISE), check whether the other system DTC is set.
3.
Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.