Outside Temperature Display: Description and Operation

Outside Temperature Indicator

The outside temperature indicator A1p4 requires the following to display the temperature value:
- The outside temperature value,
- The vehicle speed signal,
- The engine operating time
and
- The coolant temperature value (models 129 and 140 as of 1.6.96, model 170, model 202 as of 08/96 and model 210).

The outside temperature value is determined by the outside temperature indicator temperature sensor B14. The temperature sensor is installed on the front left, under the bumper, and connected to the instrument cluster A1 via the 21- or 25-pin connector, coding part A assignment 1 and 2.

The vehicle speed signal, engine operating time and engine temperature value are recorded within the instrument cluster A1.

The dependency of the outside temperature indicator on the vehicle speed, engine operating time and coolant temperature prevents an excessive temperature being displayed when the vehicle is stationary or driving slowly, caused by heat radiated from the engine, for example.

Function on model 202 up to 08/95

The temperature last measured is stored and displayed when the ignition is switched on and off and at speeds below approx. 20 km/h.

If the temperature drops below the stored value, the current temperature is displayed again.
If the temperature rises above the stored value, the current temperature is only displayed under the following conditions:

- When the engine is not running, with a 6-fold delay related to the preceding engine operating time. For example, after an engine operating time of 5 minutes the current temperature is only displayed after 30 minutes. However, the maximum delay is 1 hour.
Up to 09.94
- After approx. 5 minutes at speeds between 20-60 km/h
- After approx. 2 minutes at speeds above 60 km/h.
As of 09.94
- After approx. 3 minutes at speeds between 20-45 km/h
- After approx. 1.5 minutes at speeds above 45 km/h

Function on models 129 and 140 as of 1.6.96, model 170, model 202 as of 08/96 and model 210

- The current outside temperature value is always displayed when the ignition is switched off and on and at an engine temperature < 60 °C.
- The temperature value last measured is stored and displayed when the ignition is switched off and at an engine temperature > 60 °C.
- The stored temperature value is displayed when the ignition is switched on and at an engine temperature > 60 °C.

If the outside temperature drops below the stored value, the current temperature is displayed again.
If the temperature rises above the stored value, the current temperature is only displayed under the following conditions:

- When the engine is not running, with a 6-fold delay related to the preceding engine operating time. For example, after an engine operating time of 5 minutes the current temperature is only displayed after 30 minutes. However, the maximum delay is 1 hour.
- After approx. 3 minutes at speeds between 20-45 km/h
- After approx. 1.5 minutes at speeds above 45 km/h