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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.