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.
Switches For VOLVO On Call
The switches for and are on the dashboard under the switch for the hazard warning flashers. The switches are only for phone modules (PHM) with Volvo On Call functionality.
The switches are directly connected to the phone module (PHM).
The switches are powered and grounded via the phone module (PHM). The luminance is regulated by a pulse width modulated 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.