System Overview: Signals
The chart below summarizes the input signals to and output signals from the supplemental restraint system module (SRS). The signal types are divided into directly connected signals and Controller area network (CAN) communication. The following illustration displays the same information with the Volvo component designations.
| Input signals | Output signals |
| Directly connected: | Directly connected: |
| Side impact sensor left B-post (7/115) | Central electronic module (CEM) (4/56), collision output signal |
| Side impact sensor right B-post (7/116) | Phone Module (PHM) (16/60), collision output signal |
| Side impact sensor left C-post (7/108) | Seat belt tensioner left front (8/33) |
| Side impact sensor right C-post (7/109) | Seat belt tensioner right front (8/34) |
| Seat belt buckle (3/94) (from model year 2003-) | Seat belt tensioner left rear (8/55) |
| Seat belt buckle (3/93) (from model year 2003-) | Seat belt tensioner right rear (8/56) |
| Seat belt tensioner center rear (8/62) | |
| Airbag passenger front stage 1 (8/31) | |
| Airbag passenger front stage 2 (8/32) | |
| Airbag driver stage 1 (8/30) | |
| Airbag driver stage 2 (8/61) | |
| Side impact protection (SIPS) bag left front (8/51) | |
| Side impact protection (SIPS) bag right front (8/52) | |
| Left inflatable curtain (8/66) | |
| Right inflatable curtain (8/67) | |
| Via Controller Area Network (CAN) communication: | Via Controller Area Network (CAN) communication: |
| Central electronic module (CEM) (4/56) | Central electronic module (CEM) (4/56) |
| Driver information module (DIM) (5/1) | Driver information module (DIM) (5/1) |
| Phone module (PHM) (16/60) | |
| Rear electronic module (REM) (4/58) |