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.
2012 Volvo XC90 R-Design, AWDFACTORY OEM SERVICE PROCEDURE
Signal Specification
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds |
| PWM = | Pulse width modulated signal as a % | - | - |
CONNECTOR C1
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Other |
| - | #C1-1 | Power supply | U = Ubat | - |
| - | #C1-2 | Ground, power supply | U = Ulow | - |
| - | #C1-3 | Reserve | - | - |
| - | #C1-4 | Reserve | - | - |
| - | #C1-5 | MOST input signal | Optical input signal when the MOST network is activated | - |
| - | #C1-6 | MOST output signal | Optical output signal when the MOST network is activated | - |
Factory Service Tools
Use the Manual With the Right Hardware
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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.