B1040 DescriptionThe Crash Zone Sensor is the main “G” sensor that generates a signal voltage when it detects deceleration beyond the specified level caused by a frontal vehicle collision.
When the Air Bag Diagnosis Sensor Unit (ACU) defines both signal voltage of the “G” sensor and the safing sensor to be that of a collision which exceeds a specified level, the driving circuit switches on and feeds the electric ignitor of both driver and passenger air bags and pre-tensioner seat belt.
The Crash Zone Sensor has an integrated type of the “G” sensor element for frontal collision with output terminals for signal voltage.
B1040 Information for specific makes
Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service
- Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
- Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
- Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
- Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.