Remove electrical heating
WARNING:
High-voltage system.
The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Mortal hazard through electric shock!
The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Mortal hazard through electric shock!
- All work on the high-voltage system may only be carried out by specially trained and technically experienced personnel.
- For additional information see:
- For additional information see:
NOTE:
TECHNICAL INFORMATION
With the ignition off and the high-voltage safety plug disconnected, the Check Control message "High voltage system faulty" is displayed by default.
The message "High-voltage system switched off" (absence of voltage) is only displayed when the ignition is switched on.
With the ignition off and the high-voltage safety plug disconnected, the Check Control message "High voltage system faulty" is displayed by default.
The message "High-voltage system switched off" (absence of voltage) is only displayed when the ignition is switched on.
Preliminary work
- refer to REMOVING THE ACOUSTIC COVER .
- refer to REMOVING THE FLAP IN THE RIGHT-HAND LUGGAGE COMPARTMENT TRIM PANEL .
- refer to DE-ENERGIZING THE HIGH-VOLTAGE SYSTEM .
- refer to CHECKING THAT NO VOLTAGE IS APPLIED .
- refer to DISCONNECTING THE NEGATIVE BATTERY CABLE .
- refer to REMOVING THE VEHICLE ELECTRICAL SYSTEM SUPPORT BATTERY .
- refer to REMOVING BATTERY HOUSING (ENGINE COMPARTMENT) .
- refer to REMOVING CONTROL UNIT HOLDER .
- refer to DRAINING THE COOLANT FROM THE HIGH-TEMPERATURE COOLING SYSTEM .
- Unlock and disconnect the plug connection (1) at the changeover valve.
- Loosen screws (2).
- Remove the changeover valve (2) from the holder and put it to one side.
The coolant hoses (1) remain on the changeover valve.
- Unlock plug connection (1) and disconnect.
- Unlock plug connection (2) and disconnect.
CAUTION:
Potential equalization in high-voltage system.
Mortal hazard if the potential equalization screw connection is not correct!
Mortal hazard if the potential equalization screw connection is not correct!
- Observe the safety requirements for the potential equalization screw connection.
- Clean contact faces and have then checked by a second person.
- Tighten the screws/nuts for potential equalization with torque; have a second person check the torque.
- Correct execution of these tasks must be documented in the vehicle records by both persons.
- Loosen the nut (4) and remove the equipotential bonding line.
- Unlock and disconnect the high-voltage cable (3).
- Loosen screw (5).
- Loosen the spring band clamp (1)
at the electrical heating (2)
and pull off the coolant hose.
- Pull the electrical heating (3) slightly forward.
- Unlock and disconnect the coolant hose (1) at the electric coolant pump (2).
- Remove the electrical heating (3) toward the top.