Supplemental Inflatable Restraint (SIR)

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
When there is a frontal crash of sufficient force to activate the arming sensor and at least one of the two discriminating sensors simultaneously, DTC 51 is set. At this time the DERM will record information regarding SIR system status and vehicle status in EEPROM. DTC 52 will set when the DERM has stored information regarding eight frontal crash events.

DTC WILL SET WHEN
The DERM attempts to store frontal crash information and finds the EEPROM data area full.

ACTION TAKEN
DERM turns "ON" the "AIR BAG" warning lamp and sets a diagnostic trouble code.

DTC WILL CLEAR WHEN
The DERM receives a scan tool "Clear Codes" command. If, at the next ignition "ON" after receiving a "Clear Codes" command, the DERM detects the data area is full, a history diagnostic trouble code is set. This allows the "AIR BAG" warning lamp to illuminate should any additional malfunctions be detected.