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.
2008 Volvo XC90 Base, AWDFACTORY OEM SERVICE PROCEDURE
Rain Sensor
Connector A, terminals #A1-#A5
U = DC in volts (V).
Ubat = battery voltage in volts (V).
Ulow = voltage near 0 V.
| Terminal, control module | Signal type | Ignition off | Ignition on | Miscellaneous |
|---|---|---|---|---|
| #A1 | Serial communication | - | - | Data signal |
| #A2 | Ground | Ulow | Ulow | - |
| #A3 | Power supply | Ubat /0 V | Ubat /0 V | - |
| #A4 | Windscreen wiper position signal | - | Ubat /0V | When the windscreen wipers are in the parked position, U must be Ubat . When the windscreen wipers are operating U must be 0 V (grounded). |
| #A5 | Not used | - | - | - |
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.