Sunroof (Description): Description and operation

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: l Sunroof ECU. l BCU. l Front sunroof switch. l Front sunroof motor and microswitch. l Rear sunroof - front switch. l Rear sunroof - rear switch. l Rear sunroof isolation switch. l 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:

Signal values (connector connected)