Loosening Main Wire Harness In Engine Compartment At The Left

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Voltage peaks

Risk of damage to load or to the control unit

→ Switch off ignition and remove remote control before disconnecting or removing load.

Information

Always comply with the regulations for handling ESD-sensitive components!

Assembly work may only be carried out if the mechanic is wearing the working clothes and shoes approved by Porsche .
The new part must only be removed from the ESD (electrostatic discharge) protective packaging just before installation and at the position at which the part is to be installed .
Never touch the electric pins and plug contacts .

Fig 1: Overview Of Main Wire Harness In Engine Compartment At Left
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. Ground Point
2. Electric Plug Connection For Front Wire Harness
3. Electric Plug Connection For ABS Wire Harness
4. Electric Plug Connection For Level Sensor
5. Electric Plug Connections For Auxiliary Heating
6. Electric Plug Connection For Spring Strut
7. Heat Shield Between Primary Catalytic Converter And Wheel Housing
8. Electric Plug Connection For Steering
9. Electric Plug Connection For Brake Light Switch
10. Electric Plug Connection For Brake Fluid Level Sensor
11. Electric Plug Connection For Headlights
12. Electric Plug Connection For Relay Carrier
13. Electric Plug Connection For Side Marker Light
14. Electric Plug Connection For Sensor For Body

Unscrew fastening nut from ground point -1- at the wheel housing.
Release and disconnect electric plug connection for connection point for front wire harness -2- .
Release and disconnect electric plug connection for ABS wire harness -3- in the wheel housing.
Release and disconnect electric plug connection for level sensor -4- . → 431855 REPLACING FRONT LEVEL SENSOR
For Vehicles With Auxiliary Heating:
Release and disconnect electric plug connections for auxiliary heating -5- . → 822019 REMOVING AND INSTALLING COMPLETE AUXILIARY HEATING SYSTEM
For vehicles without auxiliary heating:
Release and disconnect electric plug connection for additional coolant pump -15- .

Fig 2: Identifying Installation Position Of Connector For Additional Coolant Pump And Coolant Valve Unit
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
For vehicles without auxiliary heating:
Release and disconnect electric plug connection for coolant valve unit -16- .
Release and disconnect electric plug connection for sensor for body -14- . → 433419 REMOVING AND INSTALLING SENSOR FOR BODY
Release and disconnect electric plug connection for spring strut -6- (next to power-steering reservoir).
Release and disconnect electric plug connection for steering -8- (in universal joint area).
Loosen relay box.

Fig 3: Identifying Relay Box And Screws
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. 11.1. Unscrew fastening screws -13- .
2. 11.2. Release and disconnect electric plug connections -12- for main wire harness in engine compartment.
  
  Fig 4: Removing Relay Box
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. 11.3. Pull main wire harness for engine compartment out of the bracket at the relay box -A- .
4. 11.4. Remove relay box by pulling it up. The relay box is clipped in at the underside with three catches.
Release and disconnect electric plug connection for brake light switch -9- . → 943619 REMOVING AND INSTALLING BRAKE LIGHT SWITCH
Release and disconnect electric plug connection for brake fluid level sensor -10- .

Fig 5: Identifying Fastening Points For Main Wire Harness In Engine Compartment At Left
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. Heat Shield Between Primary Catalytic Converter And Wheel Housing
2. Fastening Points For Wiring For Steering
3. Fastening Points For Wiring For Auxiliary Heating Or Coolant Valve Unit
4. Fastening Points In Engine Compartment
5. Rubber Sleeve In Cross Panel
6. Fastening Points In Plenum Panel
Remove heat shield between primary catalytic converter and wheel housing -1- .
1. 14.1. Unscrew six fastening screws.
Loosen fastening points for wiring for steering -2- .
Loosen fastening points for wiring for auxiliary heating or coolant valve unit -3- .
Loosen fastening points in engine compartment -4- .
Pull rubber sleeve in cross panel -5- out of the body.
Loosen fastening points in plenum panel -6- .