With Manufacturer Scan Tool

Check DTC Memory (Function 02)

NOTE:
- The A/C Control Head -E87- switches automatically to "Econ" operating mode, if the basic setting has not been carried out after replacing E87, or the measured pressure of High Pressure Sensor -G65- is too low or too high (compressor should not be switched on) see Read measuring value block. This condition is stored as a malfunction in the DTC memory. Measuring Value Blocks (Function 08)
- If the A/C control module -E87- automatically changes into operating mode "Off" after the ignition was switched on and with the ignition switched on, only the operating mode "Def" can be selected (other selections are not possible). In this case, (for example) the ignition has been switched on with a key, that is not enabled for this vehicle or the control module in the instrument cluster does not send the key number via the CAN-bus comfort system.
- With ignition switched off connect VAS 5051 Vehicle Diagnostic, Testing and Information System with the VAS 5051/1 diagnostic cable to the 16-pin diagnostic connector on the vehicle and select address word "08 - A/C heater/electronics". Connecting VAS 5051 Tester

Indicated on display of VAS 5051:







- Select "02 - Check DTC memory" function.

Indicated on display of VAS 5051:







- Display field -1- indicates the number of stored malfunctions.
- Display field -2- indicates the DTC, the malfunction location and malfunction type of the saved malfunction.

NOTE:
- By clicking the <-button, you will return to the selection menu.
- If no malfunction is recognized, yet the climate control system does not operate properly (e.g. continuous or sporadic no cooling performance, system control is insufficient, fresh air blower speed cannot be regulated or the -E87- always switches into "Econ" or "Off" mode):
1. - Read measuring value block (function 08). Measuring Value Blocks (Function 08)
2. - Carry out output Diagnostic Test Mode (DTM) (function 03). Output Diagnostic Test Mode (DTM) (Function 03)
3. - Check cooling performance of climate control system. A/C Refrigerant System, Testing
- If malfunction were recognized:
1. - Repair malfunction.
2. - Check DTC memory (function 02)
3. - Erase DTC memory (function 05)
4. - Check coding of A/C Control Head -E87- or instrument cluster. Code Control Module (Function 07)
5. - Carry out function 04, basic setting.
6. - Check DTC memory (function 02) and if necessary eliminate displayed malfunctions, erase DTC memory (function 05) and repeat procedure.
7. - End Output (function 06).

Indicated on display of VAS 5051:







- End Output (function 06).
- Switch off ignition and disconnect diagnostic cable.