| Table 1: | DTC B1071 Internal SDM Failure |
Circuit Description
DTC B1071 is an indication of a potential internal inflatable restraint sensing and diagnostic module (SDM) malfunction. DTC B1071 will set upon detection of any condition in the table below.
Conditions for Running the DTC
Ignition 1 voltage is within the normal operating voltage range.
Conditions for Setting the DTC
Malfunction | Detection Test |
|---|---|
23 VLR voltage out of normal operating range. | Power-On, continuous monitoring |
Crash data recording reserve voltage discharge time failure for three consecutive ignition cycles. | Power-On |
The calculated checksum for internal memory does not match the stored value. | Power-On |
The driver or passenger deployment loop is shorted to ground. | Continuous monitoring |
The accelerometer is malfunctioning. | Power-On, continuous monitoring |
The driver or passenger current source is malfunctioning. | Resistance measurement |
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 arming sensor inside the inflatable restraint sensing and diagnostic module (SDM) is not closed during a deployment event. | Asynchronously |
The voltage measured at DRIVER SIDE LOW and PASSENGER SIDE LOW is too low. | Power-On, continuous monitoring |
The device inside the inflatable restraint sensing and diagnostic module (SDM) that arms the system for deployment is malfunctioning. | Power-On, continuous monitoring |
The permanent memory storage area is malfunctioning. | Power-On |
Action Taken When the DTC Sets
| • | The SDM sets a DTC B1071. |
| • | The SDM turns ON the AIR BAG warning lamp. |
Conditions for Clearing the DTC
| • | The malfunction has not been detected for 500 milliseconds. |
| • | You issue a scan tool CLEAR CODES command. |
| • | Once 250 malfunction free ignition cycles have occurred. |
Diagnostic Aids
When you issue a scan tool CLEAR CODES command, some of the indicated malfunctions will only allow the AIR BAG warning lamp to go out briefly then come back ON.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
|
Notice: When DTC B1018 or B1024 has been set it is necessary to replace the inflatable restraint Sensing and Diagnostic Module (SDM). Setting DTC B1018 or B1024 will also cause DTC B1071 to set. When a scan tool clear codes command is issued and the malfunction is no longer present, DTC B1018 or B1024 and DTC B1071 will remain current. Make sure that the short to ground condition is repaired prior to installing a replacement SDM to avoid damaging the SDM. | ||||
1 | Did you perform the SIR Diagnostic System Check? | -- | ||
2 | Is DTC B1018 set? | -- | ||
3 | Is DTC B1024 set? | -- | ||
4 |
Did you complete the replacement? | -- | -- | |
