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 upper electronic module. The signal types are divided into directly connected signals, serial communication and Control area network (CAN) communication. The illustration below displays the same information and the Volvo part numbers.
| Input signals | Output signals |
| Directly connected: | Directly connected: (power supply unless otherwise stated) |
| Control signal reading lamps (x 4) | Movement sensor (optional extra) |
| Remote control (data) | Reading lamps (x 4) |
| Remote control (frequency) | Roof lighting |
| Remote control (signal strength) | Cargo compartment lighting |
| Photo sensor rear view mirror (x 2) | Voltage supply signal EXT. X |
| Remote control receiver | |
| Anti-dazzle for the rear view mirror (optional extra) | |
| Diodes in the rear view mirror | |
| Via serial communication: | Via serial communication: |
| Siren (optional extra) | Siren (optional extra) |
| Sun roof (optional extra) | Sun roof (optional extra) |
| Movement sensor (optional extra) | Movement sensor (optional extra) |
| Rain sensor (optional extra) | Rain sensor (optional extra) |
| Via Control area network (CAN) communication: | Via Control area network (CAN) communication: |
| Central electronic module | Accessory electronic module (optional extra) |
| Driver's door module | Central electronic module |
| Engine control module (ECM) | Driver's door module |
| Carphone module (optional extra) | Passenger door module |
| Steering wheel module | Carphone module (optional extra) |
| Rear electronic module |
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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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