• | 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 | -- |
Signal Terminal 5 | 1 | 1 | 1* | -- |
Signal Terminal 4 | 1 | 1 | 1* | -- |
Signal Terminal 3 | 1 | 1 | 1* | -- |
Signal Terminal 2 | 1 | 1 | 1* | -- |
Sunroof Switch Ground | -- | 1 | -- | -- |
Sunroof Control Module Ground | -- | 1 | -- | -- |
* Internal damage to the sunroof switch may occur if shorted to B+ 1. Power sunroof malfunction 2. Power sunroof operates with ignition OFF |
The sunroof control module determines the sunroof motor direction based on the inputs received from the sunroof switch. The sunroof switch is a rotary dial type switch with four outputs, the sunroof switch data 1 through 4 signal circuits. The coded inputs to the sunroof control module will initiate a request to slide the sunroof window to a specific position. The sunroof control module supplies the corresponding switch data signal circuits with a 12-volt reference. When the ignition switch is in the ON position, voltage is applied to the sunroof control module via the electronic control unit and the S/ROOF 20A fuse located in the instrument panel fuse block.
If the sunroof is experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open. If the sunroof switch ground circuit is open, the switch may take a redundant path to ground through the switch illumination circuit. When the lights are turned ON, the redundant path to ground is removed, and the sunroof will become inoperative.
Sunroof Description and Operation
Note: Portions of the circuit/system testing require removal of the headliner. It is suggested that the sunroof switch component test is performed prior to removing the headliner.
⇒ | 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 sunroof control module. |
⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the sunroof control module. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If less than the specified value, test for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module. |
⇒ | If less than the specified value, test for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module. |
⇒ | If less than the specified value, test for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module. |
⇒ | If less than the specified value, test for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module. |
⇒ | If not the specified value for all switch positions, test the appropriate signal circuit for a short to battery voltage. If all circuits test normal, replace the sunroof switch. |
Switch Position | Terminal 1 & Terminal 2 | Terminal 1 & Terminal 3 | terminal 1 & Terminal 5 | Terminal 1 & Terminal 6 |
---|---|---|---|---|
Vent Position 3 | 0-200 Ω | Infinite | Infinite | Infinite |
Vent Position 2 | Infinite | 0-200 Ω | Infinite | Infinite |
Vent Position 1 | 0-200 Ω | 0-200 Ω | Infinite | Infinite |
Close | 0-200 Ω | 0-200 Ω | Infinite | 0-200 Ω |
Roof Position 1 | Infinite | 0-200 Ω | Infinite | 0-200 Ω |
Roof Position 2 | Infinite | Infinite | Infinite | 0-200 Ω |
Roof Position 3 | 0-200 Ω | Infinite | Infinite | 0-200 Ω |
Roof Position 4 | 0-200 Ω | Infinite | 0-200 Ω | 0-200 Ω |
Roof Position 5 | Infinite | Infinite | 0-200 Ω | 0-200 Ω |
Roof Position 6 | Infinite | 0-200 Ω | 0-200 Ω | 0-200 Ω |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for sunroof motor/actuator replacement, setup, and programming |