Circuit Description
DTC B1000 is an indication of a potential internal inflatable restraint sensing and diagnostic module (SDM) malfunction. DTC B1000 will set upon detection of any condition in the table below.
Conditions for Setting the DTC
Malfunction | Detection Test |
|---|---|
23 VLR is out of the normal operating voltage 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 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 commands ON the AIR BAG warning lamp via Class 2 serial data.
Conditions for Clearing the DTC
| • | You issue a scan tool CLEAR CODES command. |
| • | A history DTC will clear once 255 malfunction free ignition cycles have occurred. |
| • | The fault condition detected by the SDM goes away. |
When the SDM detects that no DTCs are present, the SDM commands the AIR BAG warning lamp OFF.
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 turn OFF briefly then come back ON.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the SIR Diagnostic System Check? | -- | ||
2 | Replace the inflatable restraint sensing and diagnostic module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the replacement? | -- | -- |
