Diagnostic Instructions
| • | 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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | 1 | 1 | -- | -- |
Ignition | 1 | 1 | -- | -- |
Sunroof Switch Close Signal | 1 | 3 | 1 | -- |
Sunroof Switch Open Signal | 1 | 2 | 1 | -- |
Low Reference - Sunroof Switch | -- | 1 | -- | -- |
Ground - Sunroof Motor | -- | 1 | -- | -- |
1. Power sunroof malfunction 2. Power sunroof does not open 3. Power sunroof does not close | ||||
Circuit/System Description
The sunroof motor 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. Ignition voltage is supplied to the sunroof motor by the RAP fuse. B+ is applied to the sunroof motor via the S/ROOF fuse.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Sunroof Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- With the sunroof in the closed position, press the sunroof open switch. The sunroof should open.
- With the sunroof in the open position, press the sunroof close switch. The sunroof should close.
Circuit/System Testing
Important: Because of the accessibility of the sunroof switch, perform the sunroof switch component test before beginning the Circuit/System Testing.
- Ignition OFF, disconnect the harness connector at the sunroof motor .
- Test for less than 5.0 ohm between the ground circuit terminal 1 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.
- Ignition OFF, connect the harness connector at the sunroof motor.
- Disconnect the harness connector at the sunroof switch.
- Test for less than 5.0 ohm between the low reference circuit terminal C and ground.
- Ignition ON, momentarily install a 10-amp fused jumper wire between the signal circuit terminal D and ground. The sunroof should move.
- Momentarily install a 10-amp fused jumper wire between the signal circuit terminal E and ground. The sunroof should move.
- If all circuits test normal, test or replace the sunroof switch.
| ⇒ | 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 motor. |
| ⇒ | 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 low reference 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 motor. |
| ⇒ | 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 motor. |
Component Testing
Sunroof Switch
- With the ignition OFF, disconnect the harness connector at the sunroof switch.
- Test for infinite resistance between the switch terminals listed below and the low reference terminal C with the switch in the open position.
- Test for less than 5.0 ohms of resistance between the switch terminals listed below the low reference terminal C with the switch in the appropriate position.
| • | Roof open terminal D |
| • | Roof close terminal E |
| ⇒ | If not 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 D |
| • | Roof close terminal E |
| ⇒ | If greater than the specified range, replace the sunroof switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for sunroof motor/actuator replacement, setup, and programming |
