Power Sunroof Inoperative w/RPO C3Y
Diagnostic Aids
| Important: If the power sunroof and the power sunshade both operate normally from the power sunroof switch, but the power sunshade is inoperative from the power sunshade switch, refer to Power Sunshade Inoperative . |
| • | The power sunroof is opened and closed by using the power sunroof switch. When the sunroof opens, the power sunshade opens with it. The sunshade also closes when the sunroof closes, however, the sunshade will only close to the first closed position. From this position, the closing of the sunshade must be completed by using the sunshade switch. The power sunroof motor/actuator monitors the positions of the both the sunroof and the sunshade and limits the opening of the sunroof and the closing of the sunshade based upon the current positions of the sunroof and the sunshade. The power sunroof motor/actuator will not allow the sunroof glass to be opened more than the sunshade panel. |
| • | If a power sunroof switch data signal circuit shorts to voltage, it is likely that the circuit will open permanently inside the switch. If you are replacing the switch due to an open internal circuit, be sure to test the corresponding external circuit for a short to battery. |
| • | The power sunroof motor/actuator assembly contains the sunroof electronic control module. The individual components are not serviced separately. |
| • | The power sunroof motor/actuator is also known as the power sunroof master control module. |
| • | The power sunshade motor/actuator assembly contains the sunshade electronic control module. The individual components are not serviced separately. |
| • | The power sunshade motor/actuator is also known as the power sunroof slave module. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step verifies the ground circuit between the sunroof motor/actuator and G302. If this circuit fails, the sunroof motor/actuator cannot be powered. Both the sunroof and sunshade would be completely inoperative.
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This step verifies the battery positive voltage circuit of the sunshade motor/actuator. If this circuit fails, the sunshade motor/actuator is not powered and cannot send the position of the sunshade over the keyword 2000 serial data circuit to the sunroof motor/actuator. Both the sunroof and sunshade would be completely inoperative. Both the sunroof and sunshade would be completely inoperative.
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This step verifies the ground circuit between the sunshade motor/actuator and G302. If this circuit fails, the sunshade motor/actuator is not powered and cannot send the position of the sunshade over the keyword 2000 serial data circuit to the sunroof motor/actuator. Both the sunroof and sunshade would be completely inoperative.
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This step is actually being used to verify the ground circuit between connector C415 and G302. It is easier to access this circuit at the sunroof switch than at connector C415. If the circuit fails between C415 and G302, ground to both the sunroof switch and the sunshade switch is lost. With no signal possible from either switch, both the sunroof and sunshade would be completely inoperative.
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This step verifies the ground circuit between the sunroof switch and connector C415. If the circuit fails in this location, the sunshade can still be fully or partially operated, depending upon the position of the sunroof. It is important to remember that the sunroof motor/actuator will not allow the sunroof to be opened more than the sunshade. If the circuit fails when the power sunroof is in the fully opened position, the power sunshade can only be operated to the first closed position using the sunshade switch. If the circuit fails when the power sunroof is in the fully closed position, the power sunshade will be fully operational from the sunshade switch.
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This step begins to test the integrity of the sunroof switch data 2 signal circuit. If this circuit has become permanently open, the sunroof will become inoperative once it has been fully closed, while the sunshade will continue to be functional when operated from the sunshade switch. A short to voltage may cause the data 2 signal circuit to become permanently open.
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This step tests the sunroof switch for an open between the sunroof switch data 2 signal circuit and ground. If this circuit opens at a location inside the switch that completely interrupts ground for the data 2 signal, the sunroof will be completely inoperative once it is closed, while the sunshade will continue to be at least partially operational. There should be continuity between pins 4 and 1 at every switch position except position 0 (closed).
Step | Action | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Sunroof Schematics Connector End View Reference: Master Electrical Component List DEFINITION: The vehicle is equipped with RPO C3Y, panoramic sunroof. The power sunroof is completely inoperative. The power sunshade may be fully operational, partially operational, or completely inoperative. | |||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||||
2 | Perform the following actions in order to verify the complaint.
Does the sunroof and sunshade operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||||
3 |
Does the sunroof and sunshade operate normally? | Go to Step 29 | Go to Step 4 | ||||||||
4 | Is the power sunshade completely inoperative? | Go to Step 5 | Go to Step 12 | ||||||||
5 | The power sunroof and power sunshade are both completely inoperative. Inspect the following fuses for an open:
Is either one of the fuses open? | Go to Step 15 | Go to Step 6 | ||||||||
6 |
Does the test lamp illuminate for both circuits? | Go to Step 7 | Go to Step 25 | ||||||||
Connect the test lamp between the battery positive voltage and ground circuits of the harness connector. Does the test lamp illuminate? | Go to Step 8 | Go to Step 24 | |||||||||
Does the test lamp illuminate? | Go to Step 9 | Go to Step 25 | |||||||||
Connect the test lamp between the battery positive voltage and ground circuits of the sunshade motor/actuator harness connector. Does the test lamp illuminate? | Go to Step 10 | Go to Step 24 | |||||||||
Does the test lamp illuminate? | Go to Step 11 | Go to Step 24 | |||||||||
11 |
Is voltage present and is the voltage varying? | Go to Step 19 | Go to Step 18 | ||||||||
The power sunshade operates normally, or partially operates. The power sunroof is completely inoperative.
Does the test lamp illuminate? | Go to Step 13 | Go to Step 24 | |||||||||
Connect the test lamp between the ground circuit and the sunroof switch data 2 signal circuit of the harness connector. Does the test lamp illuminate? | Go to Step 14 | Go to Step 17 | |||||||||
14 |
Important: If the sunroof switch data 2 signal circuit is shorted to voltage, the condition may have opened this circuit inside the sunroof switch, requiring switch replacement once the external circuit has been repaired.
Is voltage present? | Go to Step 22 | Go to Step 16 | ||||||||
15 | Replace the open fuse with a good fuse. Does the fuse open again? | Go to Step 23 | Go to Step 29 | ||||||||
Select each one of the following sunroof switch positions while testing for continuity between pins 4 and 1 of the switch.
Is there continuity between pins 4 and 1 at each switch position? | Go to Step 20 | Go to Step 21 | |||||||||
17 | Test the sunroof switch data 2 signal circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 29 | Go to Step 20 | ||||||||
18 | Test the keyword 2000 serial data circuit for the following conditions:
Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 29 | Go to Step 20 | ||||||||
19 | Inspect for poor connections at the harness connector of the sunshade motor/actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 29 | Go to Step 27 | ||||||||
20 | Inspect for poor connections at the harness connector of the sunroof motor/actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 29 | Go to Step 26 | ||||||||
21 | Inspect for poor connections at the harness connector of the sunroof switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 29 | Go to Step 28 | ||||||||
22 | Repair the sunroof switch data 2 signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs. Did you complete the repair? | Go to Step 29 | -- | ||||||||
23 | Repair the voltage circuit associated with the open fuse for a short to ground.
Refer to Circuit Testing and Wiring Repairs. Did you complete the repair? | Go to Step 29 | -- | ||||||||
24 | Repair the open ground circuit. Refer to Circuit Testing and Wiring Repairs. Did you complete the repair? | Go to Step 29 | -- | ||||||||
25 | Repair the appropriate voltage circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs. Did you complete the repair? | Go to Step 29 | -- | ||||||||
26 | Replace the sunroof motor/actuator. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 29 | -- | ||||||||
27 | Replace the sunshade motor/actuator. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 29 | -- | ||||||||
28 | Replace the sunroof switch. Refer to Sunroof Switch Replacement . Did you complete the replacement? | Go to Step 29 | -- | ||||||||
29 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 | ||||||||
Power Sunroof Inoperative w/RPO CF5
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 Voltage | 1 | 1 | -- | -- |
Sunroof Switch Close Signal | 3 | 3 | 1 | -- |
Sunroof Switch Open Signal | 1 | 2 | 1 | -- |
Sunroof Switch Low Reference | -- | 1 | -- | -- |
Sunroof Motor Ground | -- | 1 | -- | -- |
1. Power sunroof Malfunction 2. Power sunroof does not open 3. Power sunroof does not close | ||||
Circuit/System Description
The sunroof control module supplies voltage to the sunroof switch through the sunroof switch open and close signal circuits. It also supplies ground to the sunroof switch through the switch low reference circuit. When the roof open or closed switch is pressed, ground is applied through the switch contacts and the appropriate signal circuit to the control module. The control module then internally applies battery positive voltage and ground to the appropriate circuits of the reversible power sunroof motor in order to move the sunroof glass panel to the vent, open or close position.
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 vent.
- With the sunroof in the closed position, press and hold the sunroof open switch for 2 seconds. The sunroof should open.
- With the sunroof in the open position, press the sunroof close switch. The sunroof should close.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the sunroof switch.
- Test for less than 5 ohms between the low reference circuit terminal B and ground.
- Connect a 3A fused jumper wire between the following sunroof switch signal circuits and ground. The roof should be inoperative in at least one or more directions.
- Ignition OFF, disconnect the harness connector at the sunroof control module.
- Test for less than 5 ohms between the ground circuit terminal 1 and ground.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
- Verify that a test lamp illuminates between the ignition voltage circuit terminal 3 and ground.
- Ignition OFF, connect the harness connector at the sunroof control module.
- Ignition ON, test for B+ between the following sunroof switch signal circuits and ground.
- If all circuit test normal, replace the sunroof control module.
| ⇒ | If greater than the specified range, test the following ground circuits for an open/high resistance. If the circuits test normal, replace the sunroof motor/actuator. |
| • | Sunroof switch low reference circuit terminal B |
| • | Sunroof motor/actuator harness connector ground circuit terminal 1 |
| • | Terminal C sunroof switch open signal |
| • | Terminal A sunroof switch close signal |
| ⇒ | If the roof moved in all directions, 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, repair the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance. |
| • | Sunroof switch open signal terminal C. |
| • | Sunroof switch close signal terminal A. |
| ⇒ | 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. |
Component Testing
Sunroof Switch
- Ignition OFF, disconnect the harness connector sunroof switch.
- Test for infinite resistance between the following sunroof switch signal terminals and the low reference circuit terminal B.
- Test for less than 5 ohms between the sunroof switch open signal terminal D and the ground circuit terminal B with the switch in the closed position.
| • | Sunroof switch open signal circuit terminal C. |
| • | Sunroof switch close signal circuit terminal A. |
| ⇒ | If less than the specified value, replace the sunroof switch. |
| • | Sunroof switch open signal circuit terminal C. |
| • | Sunroof switch close signal circuit terminal A. |
| ⇒ | 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 |
