Occupant Classification Sensor Inspection [Two-Step Deployment Control System - Us/CANADA Spec.]
WARNING: This page is about a different car, the 2017 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
- Handling a side air bag improperly can accidentally operate (deploy) the air bag, which may seriously injure you. Read the service warnings/cautions in the Workshop Service Information before handling the front seat (side air bag integrated). (See AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .) (See AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA SPEC.] .)
- If the sliding mechanisms on both sides are not locked after assembling the front seat, the front seat will operate accidentally while the vehicle is driven, which could result in serious injury. After assembling the front seat, shake it up and down and verify that the sliding mechanism on the both sides are locked.
NOTE:
- If cargo is put on the sensor detection area of the occupant classification sensor, the sensor may respond.
- Switch the ignition off (LOCK).
- Disconnect the negative battery teminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
- Remove the passenger-side front seat with the passenger-side front seat connector connected. (See FRONT SEAT REMOVAL/INSTALLATION .)
- Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
- Switch the ignition ON (engine off or on).
- Connect the negative (-) lead of the tester to body ground.
- Measure the voltage at the occupant classification sensor terminals 3A and 3B with inserting the positive (+) lead of the tester into the occupant classification sensor connector.
- Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference).
- If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s).
- If not as indicated in the table, replace the front seat. (See FRONT SEAT REMOVAL/INSTALLATION .)
- If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s).
TERMINAL VOLTAGE (REFERENCE) TABLE
| Terminal | Signal | Connected to | Measurement conditions | Voltage (V) | Inspection item(s) |
|---|---|---|---|---|---|
| 3A | Ground | Body ground | Under any condition | 1.0 or less | Body ground |
| 3B | IG1 | SRS1 7.5 A fuse | Ignition switched ON (engine off) | B+ | SRS1 7.5 A fuse |
| Ignition switched OFF (LOCK) | 1.0 or less | ||||
| 3C | HS-CAN_ L | SAS control module | Terminal used for communication therefore determination based on terminal voltage is not possible. | ||
| 3D | HS-CAN_H | SAS control module | Terminal used for communication therefore determination based on terminal voltage is not possible. | ||