SRSCM receives passenger occupant detection signal which includes passenger weight class from WCS.
SRSCM controls Telltail lamp and passenger airbag whether deploy it or not according to passenger weight class.
SRSCM periodically receives passenger occupant information.
If SRSCM receives communication error or Fault information, SRSCM turns on Airbag warning light and sets DTC.
The SRSCM sets DTC B149300 if there is any error in communication between Weight Classification System ECU and SRSCM.
Item
Detecting Condition
Possible cause
DTC Strategy
Communication error
Poor connection of connected part.
Faulty SRSCM.
Enable Conditions
Ignition "ON"
Threshold Value
WCS Communication line open, short
Diagnostic Time
Qualification
More than 2.2s (1.1s x 2)
De-Qualification
More than 4s (1s x 4)
Fig.1) CAN Low/High Signal Waveform