Power Sunshade Inoperative (Front)
Power Sunshade Inoperative (Front)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The sunshade control module is located between the headliner and the roof structure, near the sunroof control module. The sunshade control module, also contains the sunshade motor and the 2 components are serviced together as a unit. The sunshade control module receives battery positive voltage and ground from the same sources as the sunroof control module; from the SUNROOF 30A fuse and body ground G401 respectively.
The sunshade switch, a rocker style switch, is located in the same bezel as the sunroof switch, above the rearview mirror. It receives battery voltage from the sunroof control module, via the sunshade switch open signal circuit and the sunshade switch close signal circuit. The sunshade switch is also grounded to body ground G401. When the switch is operated, the signal circuit for the selected mode is closed to ground, the voltage is pulled low, and the appropriate sunshade signal is provided to the sunroof control module. The sunroof control module interprets this signal, then sends a serial data message via the K-Bus serial data circuit to the sunshade control module to move the sunshade panel. In response to this message, the sunshade control module then internally applies battery voltage and ground to the appropriate circuits of the reversible sunshade motor in order to move the sunshade panel.
Diagnostic Aids
* The sunroof control module is also referenced as the sunroof motor/actuator.
* The sunshade control module is also referenced as the sunshade motor/actuator.
* Because of the accessibility of the sunroof/front sunshade switch, perform the sunshade switch component test before beginning the circuit/system testing.
* If the front glass and/or front sunshade are experiencing an intermittent inoperative condition, check the sunroof switch ground circuit for an open condition. If the sunroof switch ground circuit is open, the switch may take a redundant path to ground through the illumination circuit. When the lights are turned ON, the redundant path is removed, and the sunroof and/or sunshade will become inoperative.
* If both the front glass and the front sunshade are inoperative, the fault most likely is in the RAP relay switch supply voltage circuit, battery positive voltage circuit or sunroof control module ground circuit. If the sunroof control module is not being powered, neither will the front sunshade control module
* If any of the sunshade or sunroof switch signal circuits is shorted to voltage, the switch will most likely be open.
Reference Information
Schematic Reference
Sunroof Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Sunroof Description and Operation (Sunroof Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Circuit/System Verification
* Ignition ON, verify that the power sunroof operates.
• If not, refer to the Power Sunroof Malfunction (Power Sunroof Malfunction) diagnostic procedure.
* If the power sunroof operates, refer to Power Sunshade Inoperative Circuit/System Testing.
* If the power sunshade express feature is inoperative, refer to Power Sunshade Express Feature Inoperative Circuit/System Testing.
Circuit/System Testing
Power Sunshade Inoperative
1. Ignition OFF, disconnect the harness connector at the sunroof/front sunshade switch.
2. Ignition ON, connect a 3A fused jumper wire between the sunshade switch signal circuits listed below and ground. The sunshade should be inoperative in at least one or more directions.
* Shade open terminal 4
* Shade close terminal 6
• If the sunshade moved in both directions, replace the sunroof/front sunshade switch.
3. Ignition ON, test for B+ between the sunshade switch signal circuits listed below and ground.
* Shade open terminal 4
* Shade close terminal 6
• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the sunroof control module.
4. Ignition OFF, disconnect the harness connector at the sunshade control module.
5. Test for less than 5.0 ohms of resistance between the ground circuit terminal 9 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
7. Ignition ON, test for 10-40Hz between the K-Bus serial data circuit terminal 1 and ground.
• If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module.
8. Test for 50-200Hz between the K-Bus serial data circuit terminal 1 and ground while operating the sunshade switch in the forward and rearward directions. If not the specified range, replace the sunroof control module.
9. If all circuit test normal, replace the sunshade control module.
Power Sunshade Express Feature Inoperative
1. Ignition OFF, disconnect the harness connector at the sunroof/front sunshade switch.
2. Ignition ON, with the sunshade in the closed position, connect a 3A fused jumper wire between the sunshade open signal circuit terminal 4 and the sunshade express signal circuit terminal 1 to ground for less than 1 second. The sunshade should express open.
• If the sunshade did not express open, test the express signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module.
3. If all circuits test normal, replace the sunroof/front sunshade switch.
Component Testing
Sunroof Switch
1. Ignition OFF, disconnect the harness connector at the sunroof/front sunshade switch.
2. Test for infinite resistance between the switch terminals listed below and the ground circuit terminal 5 with the switch in the open position.
* Shade express terminal 1
* Roof close terminal 2
* Shade open terminal 4
* Shade close terminal 6
* Roof express terminal 7
* Roof open terminal 8
• If not the specified value, replace the sunroof switch.
3. Test for less than 5 ohms of resistance between the switch terminals listed below and the ground circuit terminal 5 with the switch in the closed position.
* Shade express terminal 1
* Roof close terminal 2
* Shade open terminal 4
* Shade close terminal 6
* Roof express terminal 7
* Roof open terminal 8
• If greater than the specified range, replace the sunroof/front sunshade switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Sunroof Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for sunshade control module and sunroof control module replacement, setup, and programming