Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Volvo XC70 BaseFACTORY OEM SERVICE PROCEDURE
Signal Specification
General
All values given below are between the terminals stated in column 1 and terminal #B4 (power ground). This applies unless otherwise indicated in brackets.
NOTE:
It is important to connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | ||
| Ubat = | Battery voltage (V) | ||
| Ulow = | Voltage approximately 0 V |
Connector C1
| Connector C1 | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Miscellaneous |
| #C1 | #C1:1 | Reserve | - | |
| #C2 | #C1:2 | Signal cable inner antenna in the passenger compartment (-) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located under the carpet in the luggage compartment. Only active when searching for remote keys. |
| #C3 | #C1:3 | Signal cable external left-hand antenna (-) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located in the external door handle in the left-hand rear door |
| #C4 | #C1:4 | Signal cable inner antenna in the passenger compartment (-) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located under the carpet in front of the center panel. Only active when searching for keys. Otherwise 0 V. |
| #C5 | #C1:5 | Reserve | - | - |
| #C6 | #C1:6 | Not connected | - | |
| #C7 | #C1:7 | Not connected | - | |
| #C8 | #C1:8 | Not connected | - | |
| #C9 | #C1:9 | Not connected | - | |
| #C10 | #C1:10 | Not connected | - | |
| #C11 | #C1:11 | Not connected | - | |
| #C12 | #C1:12 | Not connected | - | |
| #C13 | #C1:13 | Not connected | - | |
| #C14 | #C1:14 | The signal cable external right-hand antenna (+) | f=125kHz U=300Vpp The signal is difficult to read |
Located in the external door handle in the right-hand rear door. Only active when searching for remote keys. Otherwise 0 V. |
| #C15 | #C1:15 | Signal cable external left-hand antenna (+) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located in the external door handle in the left-hand rear door. Only active when searching for remote keys. Otherwise 0 V. |
| #C16 | #C1:16 | Signal cable inner antenna passenger compartment (+) |
f=125kHz U=300Vpp The signal is difficult to measure. |
Located under the carpet in front of the center panel. Only active when searching for remote keys. Otherwise 0 V. |
| #C17 | #C1:17 | Reserve | - | |
| #C18 | #C1:18 | Signal cable inner antenna passenger compartment (+) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located under the carpet in the cargo compartment. Only active when searching for remote keys. Otherwise 0 V. |
| #C19 | #C1:19 | Reserve | - | |
| #C20 | #C1:20 | Reserve | - | |
| #C21 | #C1:21 | Signal cable outer antenna rear (-) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located in rear bumper (S80). Located in liftgate (V70/XC70/XC60). Only active when searching for remote keys. Otherwise 0 V. |
| #C22 | #C1:22 | Signal cable to external antenna (+). | f=125kHz U=300Vpp The signal is difficult to measure. |
Located in rear bumper (S80). Located in liftgate (V70/XC70/XC60). Only active when searching for remote keys. Otherwise 0 V. |
| #C23 | #C1:23 | The signal cable external right-hand antenna (-) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located in the external door handle in the right-hand rear door. Only active when searching for remote keys. Otherwise 0 V. |
Connector C2
| Connector C2 | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Miscellaneous |
| #B24 | #C2:1 | Reserve | - | - |
| #B25 | #C2:2 | - supply for quick lock left rear (+) | > 10.5 V/<1.5 V | Active for approximately 0.5 seconds when opening doors. |
| #B26 | #C2:3 | Supply for quick lock right rear (+) | > 10.5 V/<1.5 V | Active for approximately 0.5 seconds when opening doors. |
| #B27 | #C2:4 | Supply for quick lock left front (+) | > 10.5 V/<1.5 V | Active for approximately 0.5 seconds when opening doors. |
| #B28 | #C2:5 | Supply for quick lock right front (+) | > 10.5 V/<1.5 V | Active for approximately 0.5 seconds when opening doors. |
| #B29 | #C2:6 | Not connected | - | - |
| #B30 | #C2:7 | Not connected | - | - |
| #B31 | #C2:8 | Not connected | - | - |
| #B32 | #C2:9 | Not connected | - | - |
| #B33 | #C2:10 | Not connected | - | - |
| #B34 | #C2:11 | Not connected | - | - |
| #B35 | #C2:12 | Not connected | - | - |
| #B36 | #C2:13 | Not connected | - | - |
| #B37 | #C2:14 | Signal cable inner antenna in the passenger compartment (+) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located under the carpet between the center console and the rear seat. Only active when searching for remote keys. Otherwise 0 V. |
| #B38 | #C2:15 | Reserve | - | - |
| #B39 | #C2:16 | Reserve | - | - |
| #B40 | #C2:17 | Signal cable inner antenna in the passenger compartment (-) | f=125kHz U=300Vpp The signal is difficult to measure. |
Located under the carpet between the center console and the rear seat. Only active when searching for remote keys. Otherwise 0 V. |
| #B41 | #C2:18 | Not connected | - | - |
| #B42 | #C2:19 | Not connected | - | - |
| #B43 | #C2:20 | Not connected | - | - |
| #B44 | #C2:21 | Not connected | - | - |
| #B45 | #C2:22 | Not connected | - | - |
| #B46 | #C2:23 | Not connected | - | - |
Connector C3
| Connector C3 | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Miscellaneous |
| #B1 | #C3:1 | Power supply, quick lock right-hand rear (-) | Ulow | - |
| #B2 | #C3:2 | Power supply, quick lock left-hand rear (-) | Ulow | - |
| #B3 | #C3:3 | Reserve | - | - |
| #B4 | #C3:4 | Ground terminal | Ulow | - |
| #B5 | #C3:5 | Power supply | Ubat | - |
| #B6 | #C3:6 | Not connected | - | |
| #B7 | #C3:7 | Not connected | - | |
| #B8 | #C3:8 | Not connected | - | |
| #B9 | #C3:9 | Not connected | - | |
| #B10 | #C3:10 | Not connected | - | |
| #B11 | #C3:11 | Not connected | - | |
| #B12 | #C3:12 | Not connected | - | |
| #B13 | #C3:13 | Not connected | - | |
| #B14 | #C3:14 | Not connected | - | |
| #B15 | #C3:15 | Not connected | - | |
| #B16 | #C3:16 | Not connected | - | |
| #B17 | #C3:17 | Not connected | - | |
| #B18 | #C3:18 | Reserve | - | |
| #B19 | #C19 | Not connected | - | |
| #B20 | #C20 | Not connected | - | |
| #B21 | #C21 | Reserve | - | |
| #B22 | #C22 | Not connected | - | |
| #B23 | #C23 | Reserve | - | |
Connector C4
| Connector C4 | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Miscellaneous |
| #A24 | #C4:1 | Power supply quick lock left front (-) | > 10.5 V/<1.5 V | Active when opening doors |
| #A25 | #C4:2 | Power supply quick lock right front (-) |
> 10.5 V/<1.5 V | Active when opening doors. |
| #A26 | #C4:3 | LS-CAN H | 2.5-4V The signal is difficult to measure. |
During communication. |
| #A27 | #C4:4 | LS-CAN L | 2.5-1V The signal is difficult to measure. |
During communication. |
| #A28 | #C4:5 | Reserve | - | |
| #A29 | #C4:6 | Not connected | - | |
| #A30 | #C4:7 | Not connected | - | |
| #A31 | #C4:8 | Reserve | - | - |
| #A32 | #C4:9 | Contact breaker in quick lock left front | Ulow | Open circuit, Grounded when the handle is pulled out to its limit position |
| #A33 | #C4:10 | Reserve | - | - |
| #A34 | #C4:11 | Reserve | - | - |
| #A35 | #C4:12 | Reserve | - | - |
| #A36 | #C4:13 | Reserve | - | - |
| #A37 | #C4:14 | Signal cable Remote Keyless Entry (RKE) | 0.5V / 1.5V | Serial communication. Signals are difficult to read. |
| #A38 | #C4:15 | Indication of remote control in the starter module (Key In) | - | Signal from the central electronic module (CEM) when remote key is inserted in the starter module. |
| #A39 | #C4:16 | Reserve | - | - |
| #A40 | #C4:17 | Reserve | - | - |
| #A41 | #C4:18 | Reserve | - | |
| #A42 | #C4:19 | Reserve | - | |
| #A43 | #C4:20 | Reserve | - | - |
| #A44 | #C4:21 | Switch quick lock right rear | f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
When fault-tracing the key. Reading taken against corresponding (-) terminal 0V not active. |
| #A45 | #C4:22 | Switch quick lock right front | Ulow | Open circuit, Grounded when the handle is pulled out to its limit position |
| #A46 | #C4:23 | Reserve | - | - |
Connector C5
| Connector C5 | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Miscellaneous |
| #A1 | #C5:1 | Reserve (-) |
- | - |
| #A2 | #C5:2 | Outer lock button right front | Ulow | Open circuit. Indicates ground connection when button is depressed. |
| #A3 | #C5:3 | Contact breaker at clutch pedal | 'Ulow | Closes when the clutch pedal is depressed to 75% of length of stroke. |
| #A4 | #C5:4 | Switch unlocking left rear | Ulow | Open circuit. Indicates ground connection when pulling out the external door handle. |
| #A5 | #C5:5 | Outer lock button right rear. | Ulow | Open circuit. Indicates ground connection when button is depressed. |
| #A6 | #C5:6 | Not connected | - | |
| #A7 | #C5:7 | Not connected | - | |
| #A8 | #C5:8 | Not connected | - | |
| #A9 | #C5:9 | Not connected | - | |
| #A10 | #C5:10 | Not connected | - | |
| #A11 | #C5:11 | Not connected | - | |
| #A12 | #C5:12 | Not connected | - | |
| #A13 | #C5:13 | Not connected | - | |
| #A14 | #C5:14 | Contact breaker at brake pedal. | 0V / 5V | Signal from the central electronic module (CEM) when brake pedal is depressed. |
| #A15 | #C5:15 | Switch quick lock left rear | Ulow | Open circuit. Grounded when the handle is pulled out to its limit position. |
| #A16 | #C5:16 | Reserve | - | - |
| #A17 | #C5:17 | External lock button left rear | Ulow | Open circuit. Indicates ground connection when button is depressed. |
| #A18 | #C5:18 | Reserve | - | - |
| #A19 | #C5:19 | Outer lock button left front | Ulow | Open circuit. Indicates ground connection when button is depressed. |
| #A20 | #C5:20 | Switch unlocking right rear | Ulow | Open circuit. Indicates ground connection when pulling out the external door handle. |
| #A21 | #C5:21 | Switch unlocking left front | Ulow | Open circuit. Indicates ground connection when pulling out the external door handle. |
| #A22 | #C5:22 | Switch unlocking right front | Ulow | Open circuit. Indicates ground connection when pulling out the external door handle. |
| #A23 | #C5:23 | Reserve | - | |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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