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.
Switch For VOLVO On Call
The switches for ON CALL and SOS are located in the instrument panel under the switch for the hazard warning signal flashers. The switches are only for the phone module (PHM) with the Volvo On Call functionality.
The switches are directly connected to the phone module (PHM).
Voltage supply and grounding of the switch lighting is via the phone module (PHM). The level of the light strength is adjusted using a pulse width modulated (PWM) signal.
There are diagnostics for the switches.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.