Circuit Description
DTC B1171 is an indication of a potential internal inflatable restraint sensing and diagnostic module (SDM) malfunction. DTC B1171 will set upon detection of any condition in the table below.
Conditions for Setting the DTC
Malfunction | Detection Test |
|---|---|
Frontal Air Bag 23VLR voltage out of normal operating range. | Power-On, Power-Off, Continuous Monitoring |
Pretensioner 23VLR voltage out of normal operating range. | Power-On, Power-Off, Continuous Monitoring |
Crash data recording reserve voltage discharge time failure for three consecutive ignition cycles. | Power-Off |
The calculated checksum for internal memory does not match the stored value. | Power-On |
The Accelerometer is malfunctioning. | Power-On, Continuous Monitoring |
A current source or a current sink is malfunctioning. | Power-On |
The temporary memory storage area is malfunctioning. | Power-On |
The Inflatable Restraint Sensing and Diagnostic Module (SDM) is unable to read from or write to EEPROM. | Power-On |
The inflator arming sensor inside the inflatable restraint sensing and diagnostic module (SDM) is not closed during a deployment event. | Asynchronously |
The pretensioner arming sensor inside the Inflatable Restraint Sensing and Diagnostic Module (SDM) is not closed during a deployment event. | Asynchronously |
DTC B1125 or B1145 is set | Continuous Monitoring |
One of the FET drivers is malfunctioning | Power-ON |
The permanent memory storage area is malfunctioning. | Power-On |
Action Taken When the DTC Sets
| • | The SDM sets a Diagnostic Trouble Code (DTC). |
| • | The SDM commands the instrument cluster (IPC) to turn ON the AIR BAG warning lamp. |
Conditions for Clearing the MIL/DTC
| • | Current DTC--The malfunction has not been detected for 500 milliseconds. |
| • | History DTC |
| - | You issue a scan tool Clear DTCs command. |
| - | Once 250 malfunction free ignition cycles have occurred. |
Diagnostic Aids
DTC B1171 indicates a fault within the SDM. Replace the SDM if DTC B1171 sets, current or history.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Notice: When DTC B1125 or DTC B1145 has been set it is necessary to replace the inflatable restraint Sensing and Diagnostic Module (SDM). Setting DTC B1125 or DTC B1145 will also cause DTC B1171 to set. When a scan tool clear codes command is issued and the malfunction is no longer present, DTC B1171 will remain current. Make sure that the short to voltage condition is repaired prior to installing a replacement SDM to avoid damaging the SDM. | ||||
1 | Was the SIR Diagnostic System Check performed? | -- | ||
2 | Is DTC B1125 set? | -- | ||
3 | Is DTC B1145 set? | -- | ||
4 |
Have the repairs been completed? | -- | -- | |
