• | 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 | -- | -- |
Ignition | 1 | 1 | 2 | -- |
Close Switch Signal | 1 | 1 | 1 | -- |
Open Switch Signal | 1 | 1 | 1 | -- |
Ground | -- | 1 | -- | -- |
1. Power sunroof inoperative 2. Power sunroof operates with ignition off |
The sunroof 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 motor determines the motor direction based on inputs received from the sunroof switch. When the motor reverses the polarity of the applied voltage, the motor reverses direction.
Sunroof Description and Operation
Control Module References for scan tool information
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 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 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 does 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 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 module. |
• | Sunroof close terminal E |
• | Sunroof open terminal D |
⇒ | If not the specified value, replace the sunroof switch. |
• | Sunroof close terminal E |
• | Sunroof open terminal D |
⇒ | If greater than the specified value, replace the sunroof switch. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for sunroof module replacement, setup, and programming |