• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
B+ | 1, 2 | 1, 2 | -- | -- |
Ignition | 1, 2 | 1, 2 | -- | -- |
Sunroof Switch Close Signal | 1 | 1 | 1 | -- |
Sunroof Switch Open Signal | 1 | 1 | 1 | -- |
Sunshade Switch Close Signal | 2 | 2 | 2 | -- |
Sunshade Switch Open Signal | 2 | 2 | 2 | -- |
Sunroof Switch Low Reference | -- | 1 | -- | -- |
Sunshade Switch Low Reference | -- | 2 | -- | -- |
Sunroof Module Ground | -- | 1 | -- | -- |
Sunshade Module Ground | -- | 2 | -- | -- |
1. Power Sunroof Malfunction 2. Power Sunshade Malfunction |
The sunroof and sunshade modules supply each of the switch signal circuits with a 12-volt reference. When a switch is pressed the signal circuit is pulled low signaling the sunroof or sunshade open or close request. The modules determine the motor direction based on inputs received from the overhead console sunroof switches. When the modules reverse the polarity of the applied voltage, the motors reverse direction. Ignition voltage is supplied to the sunroof and sunshade modules by the BCM. B+ is applied to the sunroof and sunshade modules via the S/ROOF/SUNSHADE fuse.
A short to B+ on any of the sunroof switch signal circuits will open the ground circuit in the sunroof switch.
Sunroof Description and Operation
Control Module References for scan tool information
⇒ | If the sunroof does not open, refer to Power Sunroof Malfunction. |
⇒ | If the sunroof does not close, refer to Power Sunroof Malfunction. |
⇒ | If the sunroof does not vent open, refer to Power Sunroof Vent Malfunction. |
⇒ | If the sunroof does not close, refer to Power Sunroof Vent Malfunction. |
Important: Because of the accessibility of the sunroof switch and the sunshade switch, perform the sunroof/sunshade switch component test before beginning the Circuit/System Testing.
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the fuse and determine if the sunroof or sunshade module is causing the fuse to open. Replace the appropriate module. |
⇒ | If the test lamp does not illuminate, test the ignition circuit for an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power (RAP) Malfunction . |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
Important: Apply ground to the module for no longer than 2 seconds at a time or the module could be damaged.
When performing the following tests, make sure that the sunroof or sunshade is not at its end of travel position by switching the grounded jumper to the other signal circuit if the sunroof or sunshade did not move in one direction.⇒ | If the sunroof or sunshade does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the appropriate module. |
⇒ | If the sunroof or sunshade does not move, test the signal circuit for a short to ground, short to voltage or an open/high resistance. If the circuit test is normal, replace the appropriate module. |
⇒ | If the sunroof does not vent open, replace the sunroof control module. |
⇒ | If the sunroof does not close, replace the sunroof control module. |
• | Roof/shade open terminal D |
• | Roof/shade close terminal E |
⇒ | If not the specified value, replace the appropriate switch. |
Important: If the switch tests open in any switch position other than Off, test the sunroof switch signal circuits for a short to voltage before replacing the switch.
• | Roof/shade open terminal D |
• | Roof/shade close terminal E |
⇒ | If greater than the specified range, replace the appropriate switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM, sunroof control module, or sunroof shade module replacement, setup, and programming |