Power Sunshade Inoperative (Rear)
Power Sunshade Inoperative (Rear)
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 rear sunshade control module is located between the headliner and the roof structure. 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 rear 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 rear sunshade 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 rear sunshade control module. The 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 rear sunshade control module is also referenced as the rear sunshade motor/actuator.
* Because of the accessibility of the sunshade switch, perform the sunshade switch component test before beginning the circuit/system testing.
* If the rear sunshade is experiencing an intermittent inoperative condition, check the sunshade switch ground circuit for an open condition. If the sunshade 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 is removed, and the sunshade will become inoperative.
* If either of the sunshade 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 Testing
1. Ignition OFF, disconnect the harness connector at the rear sunshade switch.
2. Ignition OFF, test for less than 5.0 ohms of resistance between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, connect a 3A fused jumper wire between the rear sunshade switch signal circuits listed below and ground. The rear sunshade should be inoperative in at least one or more directions.
* Shade open terminal 4
* Shade close terminal 6
• If the rear sunshade moved in both directions, replace the rear sunshade switch.
4. Ignition OFF, disconnect the harness connector at the rear sunshade control module.
5. Test for less than 5.0 ohms of resistance between the ground circuit terminal 1 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 6 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
7. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 3 and ground.
• If the test lamp does not illuminate, test the ignition voltage circuit for an open/high resistance.
8. Ignition OFF, connect the harness connector at the rear sunshade control module.
9. Ignition ON, at the rear sunshade switch, test for B+ between the rear 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 rear sunshade control module.
10. If all circuit test normal, replace the rear sunshade control module.
Component Testing
Rear Sunshade Switch
1. Ignition OFF, disconnect the harness connector at the rear sunshade switch.
2. Test for infinite resistance between the switch terminals listed below and the ground circuit terminal 1 with the switch in the open position.
* Shade open terminal 3
* Shade close terminal 2
• If not the specified value, replace the rear sunshade 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 open terminal 3
* Shade close terminal 2
• If greater than the specified range, replace the rear 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 replacement, setup, and programming