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.
System overview: Signals
The table below summarizes input and output signals to and from the driver information module. The signal types are divided into directly connected signals, serial communication and Control area network (CAN) communication. The graphic below displays the same information with the Volvo part numbers.
| Input signals | Output signals |
| Directly connected: | Directly connected: |
| Parking brake switch, 3/47 | - |
| Malfunction indicator lamp (MIL) | - |
| Brake fluid level sensor, 7/4 | - |
| - | - |
| Via Control Area Network (CAN): | Via Control Area Network (CAN): |
| Brake control module (ABS), 4/16 | Brake control module (ABS), 4/16 |
| Central electronic module, 4/56 | Central electronic module, 4/56 |
| ECM, 4/46 | Phone module, 16/60 |
| Phone module, 16/60 | SRS, 4/9 |
| SRS, 4/9 | RTI,16/45 |
| TCM (4/28) | Climate control module, 3/112 |
| Rear electrical module, 4/58 | - |
| Steering wheel module, 3/130 | - |
NO RELATED
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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.