When replacing the electric heater: Remount components

NOTE: DANGER High-voltage system. 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: 61 00... SAFETY INSTRUCTIONS on handling hybrid cars
For additional information see: 61 25... NOTES on repair of high-voltage battery unit

Preliminary work

Disconnect all battery GROUND LEADS .
Remove the UNDERBODY PROTECTION/FRONT THRUST FIELD .
Remove rear UNDERBODY PROTECTION .
Remove ELECTRIC HEATER .

NOTE: DANGER Potential equalization in high-voltage system. 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.

NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.

Loosen screws (1).
Remove the holder (2).
If necessary, unclip the cable bracket.

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NOTE: TECHNICAL INFORMATION
Do not twist the equipotential bonding line. If necessary mark the equipotential bonding line before removal. Pay attention to correct fitting of the equipotential bonding line.
Release nut (1).
Mark the equipotential bonding line (2) before detaching.
Replace the nut (1).
Parts: Nut
Remove the equipotential bonding line (2) from the electric heating (3) and fit correctly onto the new electric heating.

Tighten nut (1).

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TIGHTENING TORQUES SPECIFICATION

Equipotential bonding line on electrical heating
Hexagon nut M6	Tightening torque	4.0 Nm

Unlock and disconnect plug connections (1).
Remount the coolant temperature sensor (2).
Connect connectors (1) and lock.

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NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
Install the holder (2) on the new electric heater.

Tighten down screws (1).

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TIGHTENING TORQUES SPECIFICATION

Electrical heating to holder/body
Nut M6	Tightening torque	8 Nm
Hexagon screw M6x16	Tightening torque	8 Nm
Torx screw M6x12	Tightening torque	7.6 Nm

If necessary, clip in the cable bracket.

Follow-up work

Install ELECTRIC HEATER .
Reconnect all battery GROUND LEADS .
Fill the HIGH-TEMPERATURE COOLING SYSTEM with the vacuum filling equipment
Vent the HIGH-TEMPERATURE COOLANT SYSTEM .
Check the HIGH-TEMPERATURE COOLING SYSTEM for watertightness.
Install rear UNDERBODY PROTECTION .
Install the front UNDERBODY PROTECTION .