LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Volvo >> 2009 >> V70 >> Repair and Diagnosis >> Restraints >> Passive Restraints >> Occupant Weight Sensor (OWS) And Supplemental Restraint System Module (SRS) - Specifications, Electrical/Electronic >> Signal Specification, Supplemental Restraint System Module (SRS) >> Signal Specification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Signal Specification

General 

All the values indicated below are only described values, as the power supply is not permitted when the breakout box is connected.

NOTE:

It is important to connect the breakout box and check the ground connections before starting to measure.

U= DC voltage in volts (V) UAC = AC voltage in volts (V)
Ubat = Battery voltage (V) f = Frequency in Hertz (Hz)
Ulow = Voltage approximately 0 V t = Time in seconds
PWM = Pulse width modulated signal as a %    
Fig 1: Identifying Connector C1
GLL153726Courtesy of VOLVO CARS CORPORATION
CONNECTOR C1

Breakout box terminal  Control module terminal  Signal type  Ignition on (ignition position II or III) 
#B1 #C1:1 Belt tensioner, rear left (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B2 #C1:2 Belt tensioner, rear left (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B3 #C1:3 Center rear belt tensioner (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B4 #C1:4 Center rear belt tensioner (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B5 #C1:5 Rear right seat belt tensioner (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B6 #C1:6 Rear right seat belt tensioner (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B7 #C1:7 Left inflatable curtain (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B8 #C1:8 Left inflatable curtain (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B9 #C1:9 Right inflatable curtain (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B10 #C1:10 Right inflatable curtain (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B11 #C1:11 Front passenger belt tensioner (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B12 #C1:12 Front passenger belt tensioner (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B13 #C1:13 Driver's seat belt tensioner (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B14 #C1:14 Driver's seat belt tensioner (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B17 #C1:17 Driver's lap seat belt tensioner (+) (Only certain markets) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B18 #C1:18 Driver's lap seat belt tensioner (-) (Only certain markets) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B19 #C1:19 Adaptive front passenger belt force limiter (-) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B20 #C1:20 Adaptive front passenger belt force limiter (+) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B21 #C1:21 Adaptive driver's belt force limiter (+) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B22 #C1:22 Adaptive driver's belt force limiter (-) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B23 #C1:23 Front left side impact protection (SIPS) bag (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B24 #C1:24 Front left side impact protection (SIPS) bag (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#B25 #C1:25 - -
#B26 #C1:26 - -
#B27 #C1:27 CAN H During communication U = 2.5 - 4.0 V.
#B28 #C1:28 CAN L During communication U = 1.0 - 2.5 V.
#B29 #C1:29 Driver's seat position sensor, signal ground (USA/CAN only) Ulow
#B30 #C1:30 Driver's seat position sensor (+) (USA/CAN only) -
#B31 #C1:31 Front passenger seat position sensor (+) (USA/CAN only) -
#B32 #C1:32 Front passenger seat position sensor, signal ground (USA/CAN only) Ulow
#B33 #C1:33 Passenger seat belt buckle, signal ground Ulow
#B34 #C1:34 Passenger seat belt buckle (+) -
#B35 #C1:35 Driver's seat belt buckle (+) -
#B36 #C1:36 Driver's seat belt buckle, signal ground Ulow
#B37 #C1:37 Rear left belt buckle, signal ground (certain markets only) Ulow
#B38 #C1:38 Rear left belt buckle (+) (certain markets only) -
#B39 #C1:39 Center rear belt buckle (+) (certain markets only) -
#B40 #C1:40 Center rear belt buckle, signal ground (certain markets only) Ulow
#B41 #C1:41 Rear right belt buckle, signal ground (certain markets only) Ulow
#B42 #C1:42 Rear right belt buckle (+) (certain markets only) -
#B43 #C1:43 Front passenger belt retractor sensor (+) (USA/CAN only) -
#B44 #C1:44 Front passenger belt retractor sensor, signal ground (USA/CAN only) Ulow
#B45 #C1:45 Driver's belt retractor sensor, signal ground (USA/CAN only) Ulow
#B46 #C1:46 Driver's belt retractor sensor (+) (USA/CAN only) -
#B47 #C1:47 Side impact sensor, right front (+) -
#B48 #C1:48 Side impact sensor right front, signal ground Ulow
#B49 #C1:49 Side impact sensor front left, signal ground Ulow
#B50 #C1:50 Side impact sensor, left front (+) -
#B51 #C1:51 Side impact sensor, right rear (+) -
#B52 #C1:52 Side impact sensor rear right, signal ground Ulow
#B53 #C1:53 Side impact sensor rear left, signal ground Ulow
#B54 #C1:54 Side impact sensor, left rear (+) -
#B55 #C1:55 Right pressure sensor (+) (USA/CAN only) -
#B56 #C1:56 Right pressure sensor, signal ground (USA/CAN only) Ulow
#B57 #C1:57 Left pressure sensor, signal ground (USA/CAN only) Ulow
#B58 #C1:58 Left pressure sensor, (+) (USA/CAN only) -
#B59 #C1:59 - -
#B60 #C1:60 - -
#C1 #C1:61 - -
#C2 #C1:62 - -
#C3 #C1:63 - -
#C4 #C1:64 - -
#C5 #C1:65 - -
#C6 #C1:66 - -
#C7 #C1:67 - -
#C8 #C1:68 - -
#C9 #C1:69 - -
#C10 #C1:70 - -
#C11 #C1:71 - -
#C12 #C1:72 Intern CAN_L (only USA/CAN for S80/V70/XC70 and all markets for XC60) During communication U = 1.0 - 2.5 V.
#C13 #C1:73 Intern CAN_H (only USA/CAN for S80/V70/XC70 and all markets for XC60) During communication U = 2.5 - 4.0 V.
#C14 #C1:74 Front right side impact protection (SIPS) bag (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
#C15 #C1:75 Side airbag, front right (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
Fig 2: Identifying Connector C2
GLL153727Courtesy of VOLVO CARS CORPORATION
CONNECTOR C2

Breakout box terminal  Control module terminal  Signal type  Ignition on (ignition position II or III)  Miscellaneous 
- #C2:1 - - -
- #C2:2 Short-circuit rail, passenger airbag, stage 1 - Short-circuits terminals #C2:27 and #C2:28 when the connector is not connected to the control module.
- #C2:3 Short-circuit rail, passenger airbag, stage 1 - Short-circuits terminals #C2:27 and #C2:28 when the connector is not connected to the control module.
- #C2:4 Short-circuit rail, passenger airbag, stage 2 - Short-circuits terminals #C2:29 and #C2:30 when the connector is not connected to the control module.
- #C2:5 Short-circuit rail, passenger airbag, stage 2 - Short-circuits terminals #C2:29 and #C2:30 when the connector is not connected to the control module.
- #C2:6 - - -
- #C2:7 - - -
- #C2:8 Short-circuit rail, driver's airbag, stage 1 - Short-circuits terminals #C2:33 and #C2:34 when the connector is not connected to the control module.
- #C2:9 Short-circuit rail, driver's airbag, stage 1 - Short-circuits terminals #C2:33 and #C2:34 when the connector is not connected to the control module.
- #C2:10 Short-circuit rail, driver's airbag, stage 2 - Short-circuits terminals #C2:35 and #C2:36 when the connector is not connected to the control module.
- #C2:11 Short-circuit rail, driver's airbag, stage 2 - Short-circuits terminals #C2:35 and #C2:36 when the connector is not connected to the control module.
- #C2:12 - - -
- #C2:13 - - -
- #C2:14 - - -
- #C2:15 - - -
- #C2:16 - - -
- #C2:17 - - -
- #C2:18 - - -
- #C2:19 - - -
- #C2:20 - - -
- #C2:21 - - -
- #C2:22 - - -
- #C2:23 - - -
- #C2:24 - - -
- #C2:25 - - -
#A1 #C2:26 Collision Normal, f = 10 Hz, PWM = 50 %.
Impact registered, f = 250 Hz, PWM = 50 %, for up to 5 seconds.
-
#A2 #C2:27 Passenger airbag, stage 1 (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A3 #C2:28 Passenger airbag, stage 1 (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A4 #C2:29 Passenger airbag, stage 2 (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A5 #C2:30 Passenger airbag, stage 2 (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A6 #C2:31 Passenger airbag stage 3 (-) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A7 #C2:32 Passenger airbag stage 3 (+) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A8 #C2:33 Driver airbag, stage 1 (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A9 #C2:34 Driver airbag, stage 1 (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A10 #C2:35 Driver airbag, stage 2 (-) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A11 #C2:36 Driver airbag, stage 2 (+) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A12 #C2:37 - - -
#A13 #C2:38 - - -
#A14 #C2:39 Adaptive steering column (-) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A15 #C2:40 Adaptive steering column (+) (USA/CAN only) Monitoring signal during normal mode.
Ignition pulse upon activation.
-
#A16 #C2:41 - - -
#A17 #C2:42 - - -
#A18 #C2:43 - - -
#A19 #C2:44 - - -
#A20 #C2:45 - - -
#A21 #C2:46 - - -
#A22 #C2:47 Warning light activated passenger airbag (PAE) (+) Activated light:
Pulse-width modulated signal, 0 - 12 V.
Day mode: 12 V.
Night mode: 3-4 V.
Applies to 2008-
#A23 #C2:48 - - -
#A24 #C2:49 Front impact sensor right front, signal ground Ulow Does not apply to the XC60.
#A25 #C2:50 Front impact sensor right front (+) - Does not apply to the XC60.
#A26 #C2:51 - - -
#A27 #C2:52 - - -
#A28 #C2:53 - - -
#A29 #C2:54 - - -
#A30 #C2:55 - - -
#A31 #C2:56 - - -
#A32 #C2:57 - - -
#A33 #C2:58 - - -
#A34 #C2:59 Front passenger airbag switch, sensor A (+) (not USA/CAN) - -
#A35 #C2:60 Front passenger airbag switch, sensor B (+) (not USA/CAN) - -
#A36 #C2:61 Front passenger airbag switch, signal ground (not USA/CAN) - -
#A37 #C2:62 - - -
#A38 #C2:63 - - -
#A39 #C2:64 - - -
#A40 #C2:65 - - -
#A41 #C2:66 - - -
#A42 #C2:67 Power supply, supplemental restraint system module (SRS), 15-feed U = Ubat -
#A43 #C2:68 Power supply, supplemental restraint system module (SRS), 15-feed U = Ubat -
#A44 #C2:69 - - -
#A45 #C2:70 PAD lamp (+) Activated light:
Pulse-width modulated signal, 0 - 12 V.
Day mode 12 V.
Night mode 3-4 V.
-
#A46 #C2:71 - - -
#A47 #C2:72 - - -
#A48 #C2:73 - - -
#A49 #C2:74 Front impact sensor front left, signal ground Ulow Does not apply to the XC60.
#A50 #C2:75 Front collision sensor left front (+) - Does not apply to the XC60.