B1152

CAUTION: Be careful when you handle a Sensing & Diagnostic Module (SDM). Do not strike or jolt the SDM. Before applying power to the SDM:
^ Remove any dirt, grease, etc. from the mounting surface.
^ Position the SDM horizontally on the mounting surface.
^ Point the arrow on the SDM toward the front of the vehicle.
^ Tighten all of the SDM fasteners and SDM bracket fasteners to the specified torque value.
Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

CIRCUIT DESCRIPTION
The inflatable restraint Sensing and Diagnostic Module (SDM) contains a sensing device which convents vehicle longitudinal velocity changes to an electrical signal. When the SDM senses a frontal crash of sufficient force, the SDM will cause current to flow through the frontal inflator modules, deploying the frontal air bags and causing DTC B1151 to set. At this time the SDM will record information regarding the SIR system status and vehicle system status in Electrically Erasable Programmable Read Only Memory (EEPROM). DTC B1152 will set when the SDM has stored information regarding two frontal crash events.

CONDITIONS FOR SETTING THE DTC
DTC B1152 is set when the SDM attempts to store frontal crash information and finds the EEPROM memory data area full. This test is run each time the SDM stores or attempts to store information regarding a frontal crash event and also during the Power-ON tests.

ACTION TAKEN WHEN THE DTC SETS
- The SDM commands the Instrument Panel Cluster (IPC) to turn ON the AIR BAG warning lamp.
- The SDM sets a diagnostic trouble code.

CONDITIONS FOR CLEARING THE DTC
DTC B1152 will clear when the SDM receives a scan tool Clear DTCs command. If, at the next ignition ON after receiving a Clear DTCs command, the SDM 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.