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.
2011 Volvo C70FACTORY OEM SERVICE PROCEDURE
Signal Specification
General
All values given below are between the terminals stated in column 1 and terminal #B5 (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 A | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Other |
| #C1 | #A1 | Reserve | - | |
| #C2 | #A2 | + supply for quick lock left front | > 10.5 V/<1.5 V | |
| #C3 | #A3 | - supply for quick lock left front | > 10.5 V/<1.5 V | |
| #C4 | #A4 | - supply for quick lock right front | > 10.5 V/<1.5 V | |
| #C5 | #A5 | + supply for quick lock right front | > 10.5 V/<1.5 V | |
| #C6 | #A6 | Not connected | - | |
| #C7 | #A7 | Not connected | - | |
| #C8 | #A8 | Not connected | - | |
| #C9 | #A9 | Not connected | - | |
| #C10 | #A10 | Not connected | - | |
| #C11 | #A11 | Not connected | - | |
| #C12 | #A12 | Not connected | - | |
| #C13 | #A13 | Not connected | - | |
| #C14 | #A14 | Switch unlocking left front | Ulow | Open-circuit, Ground terminal at activation |
| #C15 | #A15 | Switch lock button left front | Ulow | Open-circuit, Ground terminal at activation |
| #C16 | #A16 | Switch unlocking left rear | Ulow | Open-circuit, Ground terminal at activation. Not C30/C70 |
| #C17 | #A17 | Reserve | - | |
| #C18 | #A18 | Reserve | - | |
| #C19 | #A19 | Reserve | - | |
| #C20 | #A20 | Reserve | - | |
| #C21 | #A21 | Switch lock button left rear | Ulow | Open-circuit, Ground terminal at activation. Not C30/C70. |
| #C22 | #A22 | Reserve | - | |
| #C23 | #A23 | Reserve | - | |
| Connector B | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Other |
| #B24 | #B1 | - supply for quick lock left rear | > 10.5 V/<1.5 V | Not C30/C70. |
| #B25 | #B2 | + supply for quick lock left rear | > 10.5 V/<1.5 V | Not C30/C70. |
| #B26 | #B3 | Communication CAN_H high speed network | 2.5-3.5V | During communication |
| #B27 | #B4 | Communication CAN_L high speed network | 2.5-3.5V | During communication |
| #B28 | #B5 | Signal from the central electronic module (CEM), stop lamp switch | U = Ubat | When activating the brake pedal |
| #B29 | #B6 | Not connected | - | - |
| #B30 | #B7 | Not connected | - | - |
| #B31 | #B8 | Not connected | - | - |
| #B32 | #B9 | Not connected | - | - |
| #B33 | #B10 | Not connected | - | - |
| #B34 | #B11 | Not connected | - | - |
| #B35 | #B12 | Not connected | - | - |
| #B36 | #B13 | Not connected | - | - |
| #B37 | #B14 | Reserve | - | - |
| #B38 | #B15 | Signal from remote keyless entry (RKE) | U=Ubat /U=Ubat - 1 V to Ubat - 1.5 V during communication | During communication with remote keyless entry (RKE) |
| #B39 | #B16 | Reserve | - | - |
| #B40 | #B17 | Signal from switch key-in | U = Ubat | When pressing the key in the ignition switch |
| #B41 | #B18 | Reserve | - | - |
| #B42 | #B19 | Reserve | - | - |
| #B43 | #B20 | Signal from switch clutch pedal | Ulow /open-circuit | Open-circuit, Ground terminal at activation |
| #B44 | #B21 | Not connected | - | - |
| #B45 | #B22 | Not connected | - | - |
| #B46 | #B23 | Not connected | - | - |
| Connector C | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Other |
| #B1 | #C1 | + supply for quick lock right rear | > 10.5 V/<1.5 V | Not C30/C70. |
| #B2 | #C2 | - supply for quick lock right rear | > 10.5 V/<1.5 V | Not C30/C70. |
| #B3 | #C3 | Reserve | - | |
| #B4 | #C4 | Power supply | Ubat | 30-supply via the central electronic module (CEM) |
| #B5 | #C5 | Ground terminal | Ulow | |
| #B6 | #C6 | Not connected | - | |
| #B7 | #C7 | Not connected | - | |
| #B8 | #C8 | Not connected | - | |
| #B9 | #C9 | Not connected | - | |
| #B10 | #C10 | Not connected | - | |
| #B11 | #C11 | Not connected | - | |
| #B12 | #C12 | Not connected | - | |
| #B13 | #C13 | Not connected | - | |
| #B14 | #C14 | Not connected | - | |
| #B15 | #C15 | Not connected | - | |
| #B16 | #C16 | Not connected | - | |
| #B17 | #C17 | Not connected | - | |
| #B18 | #C18 | Reserve | - | |
| #B19 | #C19 | Not connected | - | |
| #B20 | #C20 | Not connected | - | |
| #B21 | #C21 | Reserve | - | |
| #B22 | #C22 | Not connected | - | |
| #B23 | #C23 | Reserve | - | |
| Connector D | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Other |
| #A24 | #D1 | Reserve | - | |
| #A25 | #D2 | Signal cable outer antenna in the door handle, left front (-) |
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. |
| #A26 | #D3 | Signal cable outer antenna in the door handle, left 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. Not C30/C70. |
| #A27 | #D4 | Signal cable outer antenna in the door handle, right front (-) |
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. |
| #A28 | #D5 | Signal cable outer antenna in the door handle, 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. Not C30/C70. |
| #A29 | #D6 | Not connected | - | |
| #A30 | #D7 | Not connected | - | |
| #A31 | #D8 | Switch unlocking right front | Ulow | Open-circuit, Ground terminal at activation |
| #A32 | #D9 | Switch lock button right front | Ulow | Open-circuit, Ground terminal at activation |
| #A33 | #D10 | Switch quick lock right front | Ulow | Open-circuit, Ground terminal at activation |
| #A34 | #D11 | Switch quick lock left front | Ulow | Open-circuit, Ground terminal at activation |
| #A35 | #D12 | Not connected | - | |
| #A36 | #D13 | Switch quick lock left rear | Ulow | Open-circuit, Ground terminal at activation. Not C30/C70. |
| #A37 | #D14 | Switch handle tailgate | Ulow | Open-circuit, Ground terminal at activation |
| #A38 | #D15 | Switch quick lock right rear | Ulow | Open-circuit, Ground terminal at activation. Not C30/C70. |
| #A39 | #D16 | Switch unlocking right rear | Ulow | Open-circuit, Ground terminal at activation. Not C30/C70. |
| #A40 | #D17 | Switch lock button right rear | Ulow | Open-circuit, Ground terminal at activation. Not C30/C70. |
| #A41 | #D18 | Reserve | - | |
| #A42 | #D19 | Reserve | - | |
| #A43 | #D20 | Signal cable outer antenna in the door handle, left front (+) | 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. |
| #A44 | #D21 | Signal cable outer antenna in the door handle, left 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. Not C30/C70. |
| #A45 | #D22 | Signal cable outer antenna in the door handle, right front (+) |
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. |
| #A46 | #D23 | Signal cable outer antenna in the door handle, 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. Not C30/C70. |
| Connector E | ||||
|---|---|---|---|---|
| Breakout box terminal | Control module terminal | Signal type | Active / Not active | Other |
| #A1 | #E1 | Signal cable inner antenna rear (-) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located in the cargo compartment. When fault-tracing the key. Reading taken against corresponding (+) terminal. 0V not active. |
| #A2 | #E2 | Signal cable inner antenna in the passenger compartment (-) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located under the carpet behind the center console in front of the rear seat. When fault-tracing the key. Reading taken against corresponding (+) terminal. 0V not active. |
| #A3 | #E3 | Reserve | - | |
| #A4 | #E4 | Signal cable inner antenna in the passenger compartment (-) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located under the carpet below the center panel. When fault-tracing the key. Reading taken against corresponding (+) terminal. 0V not active |
| #A5 | #E5 | Reserve | - | |
| #A6 | #E6 | Not connected | - | |
| #A7 | #E7 | Not connected | - | |
| #A8 | #E8 | Not connected | - | |
| #A9 | #E9 | Not connected | - | |
| #A10 | #E10 | Not connected | - | |
| #A11 | #E11 | Not connected | - | |
| #A12 | #E12 | Not connected | - | |
| #A13 | #E13 | Not connected | - | |
| #A14 | #E14 | Signal cable outer antenna rear (+) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located in the rear bumper. When fault-tracing the key. Reading taken against the corresponding (-) terminal. 0V not active |
| #A15 | #E15 | Signal cable outer antenna in rear (-) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located in the rear bumper. When fault-tracing the key. Reading taken against corresponding (+) terminal. 0V not active |
| #A16 | #E16 | Not connected | - | |
| #A17 | #E17 | Reserve | - | |
| #A18 | #E18 | Signal cable inner antenna rear (+) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located in the cargo compartment. When fault-tracing the key. Reading taken against the corresponding (-) terminal. 0V not active |
| #A19 | #E19 | Reserve | - | |
| #A20 | #E20 | Signal cable inner antenna in the passenger compartment (+) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located under the carpet behind the center console in front of the rear seat. When fault-tracing the key. Reading taken against the corresponding (-) terminal. 0V not active |
| #A21 | #E21 | Reserve | - | |
| #A22 | #E22 | Signal cable inner antenna in the passenger compartment (+) |
f=125kHz U=300Vpp (106 Vrms ) The signal is difficult to measure. |
Located under the carpet below the center panel. When fault-tracing the key. Reading taken against the corresponding (-) terminal. 0V not active. |
| #A23 | #E23 | 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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