Power Sunroof/Sunshade Malfunction
Power Sunroof/Sunshade Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The sunroof electrical system uses a master/slave configuration utilizing a LIN-Bus based system for communication. The body control module (BCM) is designated as the master, while the sunroof and sunshade control modules are configured as the slaves.
As the system master, the BCM uses the LIN-Bus communication bus to enable or disable sunroof and sunshade operation, communicate vehicle information to each controller, and request sunroof or sunshade movement. The sunroof/sunshade controllers provide system status and diagnostic information to the BCM for diagnostic reporting and operational purposes. The control switches places a different resistor ladder network in the circuit depending on the function selected. The controllers analog to digital switch input reads the resulting voltage range and determines the function
Reference Information
Schematic Reference
Sunroof Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Sunroof Description and Operation (Spoiler System) (Description and Operation)
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Verification
Sunroof/Sunshade
1. Press the sunshade switch to the open and close positions. The sunshade should open and close when changing between the commanded states.
2. Press the sunroof switch to the open and close positions. The sunroof should open and close when changing between the commanded states.
Circuit/System Testing
Note: Because of the accessibility of the switches, perform the switch component testing before beginning the circuit/system testing.
1. Ignition OFF, disconnect the harness connector at the appropriate module.
2. Test for less than 5 ohm between the ground circuit terminals listed below and ground:
* K61 Sunroof Control Module terminal 2 and terminal 8
* K62 Sunroof Sunshade Motor Module terminal 2 and terminal 9
• If greater than the specified value, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
• 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, determine if the appropriate module is causing the fuse to open. Replace the appropriate module.
4. Ignition ON, verify that a test lamp does not illuminate between the circuit terminals listed below and ground:
* Terminal 3
* Terminal 5
• If the test lamp does illuminate, test the appropriate circuit for a short to voltage.
5. Ignition OFF, verify that a test lamp does not illuminate between the circuit terminals listed below and B+:
* Terminal 3
* Terminal 5
• If the test lamp does illuminate, test the appropriate circuit for a short to ground.
6. Disconnect the harness connector at the S72 Sunroof Switch or the S90 Sunroof Sunshade Switch.
7. Test for less than 5 ohm between the circuit terminals listed below:
* S72 Sunroof Switch terminal 1 and K61 Sunroof Control Module terminal 3
* S72 Sunroof Switch terminal 4 and K61 Sunroof Control Module terminal 5
* S90 Sunroof Sunshade Switch terminal 1 and K62 Sunroof Sunshade Motor Module terminal 3
* S90 Sunroof Sunshade Switch 4 and K62 Sunroof Sunshade Motor Module terminal 5
• If greater than the specified value, test the appropriate circuit for an open/high resistance.
8. If all circuits test normal, test or replace the appropriate module.
Component Testing
Sunroof/Sunshade Switch
Static Test
1. Ignition OFF, disconnect the harness connector at the appropriate sunroof/sunshade switch.
2. Test for 3.6-3.7 kohm between the switch terminals 1 and the low reference circuit terminal 4.
• If not within the specified range, replace the appropriate switch.
3. Test for 430-440 ohm between the signal terminal 1 and the low reference circuit terminal 4 while pressing the open switch.
• If not within the specified range, replace the appropriate switch.
4. Test for 96-100 ohm between the signal terminal 1 and the low reference circuit terminal 4 while pressing the express open switch.
• If not within the specified range, replace the appropriate switch.
5. Test for 1.7-1.8 kohm between the signal terminal 1 and the low reference circuit terminal 4 while pressing the close switch.
• If not within the specified range, replace the appropriate switch.
6. Test for 930-940 ohm between the signal terminal 1 and the low reference circuit terminal 4 while pressing the express close switch.
• If not within the specified range, replace the appropriate switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Sunroof Switch Replacement (Service and Repair)
* Sunroof Sunshade Switch Replacement (Sunroof Sunshade Switch Replacement)
* Sunroof Window Motor Replacement (Service and Repair)
* Sunroof Sunshade Motor Replacement (Sunroof Sunshade Motor Replacement)
* Control Module References (Programming and Relearning)for sunroof/sunshade motor/actuator replacement, setup, and programming