Description

Description

General

The sunroof system consists of a front and a rear sunroof assembly. Both sunroof assemblies slide and tilt to open. The sunroof system consists of the following components:
- Sunroof ECU.
- BCU.
- Front sunroof switch.
- Front sunroof motor and microswitch.
- Rear sunroof - front switch.
- Rear sunroof - rear switch.
- Rear sunroof isolation switch.
- Rear sunroof motor and microswitch.

The BCU enables operation of the sunroof ECU. If the sunroof ECU does not receive an enable signal from the BCU, neither sunroof assembly operates. The BCU is located behind the glovebox. The sunroof ECU is located above the headlining next to the front sunroof assembly.

TestBook diagnoses the sunroof ECU.

Front sunroof switch







The front sunroof switch is located in the roof console above the windscreen in front of the front sunroof. It controls the front sunroof motor via the sunroof ECU.

The front sunroof switch supplies an earth signal to the sunroof ECU. The pin at the ECU that receives the earth signal determines whether ECU causes the sunroof to open or close.

TestBook cannot monitor the state of the front sunroof switch.

The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are met:







Front sunroof motor and microswitch







The front sunroof motor is located within the front sunroof assembly. The sunroof ECU controls the front sunroof motor.

The sunroof ECU determines the direction the sunroof motor runs. A battery signal to one side of the motor and an earth to the other side of the motor causes the motor to turn in one direction, reversing the polarity through the same pins causes the motor to turn in the opposite direction.

The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are met:







Rear sunroof - front switch







The rear sunroof front switch is located in the roof console above the windscreen in front of the front sunroof. It controls the rear sunroof motor via the sunroof ECU.

The rear sunroof front switch supplies an earth signal to the sunroof ECU. The pin at the ECU that receives the earth signal determines whether ECU causes the sunroof to open or close.

TestBook cannot monitor the state of the rear sunroof front switch.

The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are met:







Rear sunroof isolation switch







The rear sunroof isolation switch is located in the roof console above the windscreen in front of the front sunroof. It prevents the rear sunroof rear switch from operating the rear sunroof.

The rear sunroof isolation switch is in the earth path between the rear sunroof rear switch and the sunroof ECU. Operating the rear sunroof isolation switch opens the circuit and prevents the rear sunroof rear switch from operating the rear sunroof.

TestBook cannot monitor the state of the rear sunroof isolation switch.

The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are met:







Rear sunroof rear switch







The rear sunroof rear switch is located in the roof console in front of the rear sunroof. It controls the rear sunroof motor via the sunroof ECU.

The rear sunroof front switch supplies an earth signal through the rear sunroof isolation switch to the sunroof ECU. The pin at the ECU that receives the earth signal determines whether ECU causes the sunroof to open or close.

TestBook cannot monitor the state of the rear sunroof rear switch.

The following table lists the values which can be measured at the listed ECU pins when the conditions outlined are met:







Rear sunroof motor and microswitch







The rear sunroof motor and microswitch are located within the rear sunroof assembly. The sunroof ECU controls the rear sunroof motor.

The sunroof ECU determines the direction the sunroof motor runs. A battery signal to one side of the motor and an earth to the other side of the motor causes the motor to turn in one direction, reversing the polarity through the same pins causes the motor to turn in the opposite direction.







Sunroof ECU







The sunroof ECU is located behind the head lining above the rear view mirror. Most functions of the sunroof ECU are covered under other components.