• | 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 | 1 | -- | -- |
Sunroof Enable Signal | 3 | 1 | 1 | -- |
Sunroof Switch Close Signal | 1 | 1 | 1 | -- |
Sunroof Switch Close Vent Signal | 1 | 1 | 1 | -- |
Sunroof Switch Express Signal | 1 | 2 | 1 | -- |
Sunroof Switch Express Vent Signal | 1 | 2 | 1 | -- |
Sunroof Switch Open Signal | 1 | 1 | 1 | -- |
Sunroof Switch Open Vent Signal | 1 | 1 | 1 | -- |
Sunroof Switch Ground | -- | 1 | -- | -- |
Sunroof Control Module Ground | -- | 1 | -- | -- |
1. Power Sunroof Malfunction 2. Power Sunroof Express Feature Malfunction 3. Sunroof Operates With Ignition OFF |
The sunroof control module supplies each of the sunroof switch signal circuits with a 12-volt reference. When a switch is pressed the signal circuit is pulled low signaling the sunroof open or close request. The sunroof control module determines the motor direction based on inputs received from the sunroof switch. When the sunroof control module reverses the polarity of the applied voltage, the motor reverses direction. A sunroof enable signal is supplied to the sunroof control module by the BCM. B+ is applied to the sunroof control module via the L/GATE/S/ROOF 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 Malfunction. |
⇒ | If the express open feature does not function, refer to Power Sunroof Express Feature Malfunction. |
Important: Because of the accessibility of the sunroof switch, perform the sunroof 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 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 replace the sunroof control module. |
⇒ | If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | 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 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 sunroof control module. |
⇒ | If the sunroof 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 sunroof control module. |
⇒ | If the sunroof 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 sunroof control module. |
⇒ | If the sunroof does not close, 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 sunroof control module. |
• | Terminal 7 |
• | Terminal 8 |
⇒ | If the sunroof did not express open, test the signal circuit terminal 7 for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof control module. |
• | Terminal 1 |
• | Terminal 4 |
⇒ | If the roof did not express open to the vent position, test the signal circuit terminal 1 for a short to voltage or an open high resistance. If the circuit tests normal, replace the sunroof control module. |
• | Roof open terminal 8 |
• | Roof express terminal 7 |
• | Roof close terminal 2 |
• | Vent open terminal 4 |
• | Vent express terminal 1 |
• | Vent close terminal 6 |
⇒ | If less than the specified value, replace the sunroof 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 open terminal 8 |
• | Roof express terminal 7 |
• | Roof close terminal 2 |
• | Vent open terminal 4 |
• | Vent express terminal 1 |
• | Vent close terminal 6 |
⇒ | If greater than the specified range, replace the sunroof switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for sunroof control module replacement, setup, and programming. |