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SUNROOF DESCRIPTION AND OPERATION 76-6-5 Description General 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, 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 switch supplies an earth signal to the sunroof ECU. The pin at the ECU that receives the earth 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 Signal values (connector connected) Connector/Pin No. Condition Resistance, ohms C0784-2 Ignition in position II, front sunroof switch released > 10,000 C0784-2 Ignition in position II, front sunroof switch open < 0.5 C0785-7 Ignition in position II, front sunroof switch released > 10,000 C0785-7 Ignition in position II, front sunroof switch closed < 0.5 |