Heated rear window, function - GF67.29-P-0003R: Notes
MODEL 230
Networking of components:
Function prerequisites
- C. 15 ON
- No overvoltage/undervoltage
- Vario roof closed and locked
Switch on heated rear window
- Press rear window defroster switch (N22s1) at AAC pushbutton control module (N22) .
- The rear SAM control module (N10/8) receives the switch-on signal for the heated rear window function over the CAN interior from the AAC pushbutton control module (N22) The heated rear window (R1) is switched on via the rear window defroster relay (K40/5kU) . This relay switches c. 30 through to the heated rear window (R1) .
- The rear SAM control module (N10/8) transmits the feedback signal to the "heated rear window ON " over the CAN interior to the AAC pushbutton control module (N22) . If this feedback signal is not received for more than 1 s, the LED for the function display at the AAC pushbutton control module (N22) switches off and the switch-on request is canceled.
Manually switching off the heated rear window
The heated rear window function can be switched off again at any time by again pressing the rear window defroster switch (N22s1) at the AAC pushbutton control module (N22) .
Automatically switching off the heated rear window
- Automatically switching off when "opening " Vario roof
- The ON period of the heated rear window (R1) is also dependent on the outside temperature.
Outside temperature t ≥ 5°C.
Automatic switch-off after 6 min .
Outside temperature t ≤ 5°C up to t 0°C
The ON period is extended by t=30 s in each case for each °C temperature difference. The maximum extension is t=6 min., which equals a temperature of t =-7°C.
Example: At an outside temperature of 2°C , the time extension is 3 * 30 seconds . The heated rear window (R1) switches off after 7.5 min. .
Outside temperature t ≤ 0°C up to t -10°C
In addition to the temperature-related extension, there is also a speed-related extension . (Refer to table below)
If the speed changes during the ON period, the extension is calculated from the highest
speed which has been measured during this time.
| Vehicle speed (km/h) | Time portion t (minutes) |
|---|---|
| 60 | 1 |
| 70 | 2 |
| 80 | 3 |
| 90 | 4 |
| 100 | 5 |
If ?? is driven faster than v = 60km/h during the heating phase, an ON period of t=1 min. is added. The maximum additional ON period is t =5 min.
Outside temperature of t ≤ -10°C
The heated rear window (R1) remains switched on until an interior temperature of t =5°C is measured at the in-car temperature sensor (N70b1) in the overhead control panel control module (N70) .
Data required for the function:
The outside temperature is measured by the ambient temperature display temperature sensor (B14) .
The value is read in by the driver SAM control module (N10/10) and forwarded over the CAN interior to the rear SAM control module (N10/8) .
The vehicle speed is calculated in the SBC control module (A7/3n1) from the wheel speed signal of the front left wheel speed sensor (L6/1) and forwarded to the ESP, PML and BAS control module (N47-5) . The ESP, PML and BAS control module (N47-5) passes on the wheel speed signal as a message over the CAN engine compartment to the EIS control module (N73) and the latter transmits the wheel speed over the CAN interior to the rear SAM control module (N10/8) .
| Heated rear window, switching off in the case of undervoltage | GF67.29-P-2005R | ||
| Heated rear window, location of components | GF67.29-P-0003-01R | ||
| Rear SAM control module with fuse and relay module, location/purpose/design | GF54.21-P-4112R | ||
| Overhead control panel control module, location/purpose/design/function | GF82.20-P-4101R | ||
| Driver SAM control module with fuse and relay module, location/purpose/design | GF54.21-P-4109R | ||
| Outside temperature sensor, location/purpose/design/function | GF83.57-P-2103R |