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.
Functional description
The KAFAS control unit controls the KAFAS camera heating.
The camera-based driver support systems control unit evaluates the following input variables for the switch-on conditions and switch-off conditions of the KAFAS camera heating:
- Terminal status: Terminal 15 on
- Ambient temperature
The one-time heating duration depends on the ambient temperature.
- Ambient temperature between 5 °C and 15 °C: One-time heating duration e.g. 100 seconds
- Ambient temperature below 5 °C: One-time heating duration e.g. 130 seconds
- Operation of the windscreen wiper
Windscreen wiper activated: Depending on the ambient temperature, the heating is periodically repeated (e.g. every 300 seconds) provided the precondition is present.
- Operation of the defrost button
Defrost function activated: The one-time heating duration for the KAFAS camera heating depends on the ambient temperature.
Defrost function deactivated: If the one-time heating duration for the KAFAS camera heating is not yet over and there is no other precondition, the heating is deactivated.
- Operation of the button for the heated rear window
Heated rear window activated: The one-time heating duration for the KAFAS camera heating depends on the ambient temperature.
Heated rear window deactivated: If the one-time heating duration for the KAFAS camera heating is not yet over and there is no other precondition, the heating is deactivated.
- Temperature and air humidity on inside of the windscreen
The condensation sensor (constituent part of the rain-light-solar-condensation sensor) detects the temperature and the air humidity on the inside of the windscreen. Depending on the ambient temperature, the heating duration is periodically repeated provided the precondition is present (e.g. above 66% air humidity).
- Battery status
The maximum temperature of the KAFAS camera heating is limited to 70 °C.
The following graphic shows a simplified representation of a KAFAS camera heating.
| Item | Explanation |
|---|---|
| A | KAFAS camera heating, outside view |
| B | KAFAS camera heating, inside view |
| 1 | Heated area of the KAFAS camera heating |
| 2 | three pin plug connection |
| 3 | Mounting plate for the rain-light-solar-condensation sensor |
| 4 | Mounting plate for the KAFAS camera |
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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.