GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 CTS 🢒 Body 🢒 Roof 🢒 Power Sunroof Inoperative

Power Sunroof Inoperative 2 connector module

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests the sunroof switch low reference circuit for an open.

    2.

  2. This step tests the sunroof switch data 6 circuit for a short to ground.

    3.

  3. This step tests the sunroof motor control circuits for a short to ground or an open.

Step

Action

Values

Yes

No

Schematic Reference: Sunroof Schematics

Connector End View Reference: Power Roof Systems Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Attempt to operate the power sunroof through its full range of functions in order to verify that the power sunroof inoperative fault is present.

Does the power sunroof operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Inspect the RAP fuse for an open.

Is the fuse open?

--

Go to Step 11

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Open the driver door.
  3. Disconnect the sunroof switch.
  4. Measure the resistance from the low reference circuit of the sunroof switch harness connector to a good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 5

Go to Step 12

5

  1. Turn ON the ignition, with the engine OFF.
  2. Measure the voltage from the sunroof switch data 6 circuit of the sunroof switch harness connector to the sunroof switch low reference circuit of the sunroof switch harness connector.

Does the voltage measure within the specified range?

9-16 V

Go to Step 9

Go to Step 6

6

Test the sunroof switch data 6 circuit of the sunroof switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Step 7

7
  1. Turn OFF the ignition.
  2. Open the driver door.
  3. Connect the sunroof switch.
  4. Disconnect the sunroof control module harness connector C1.
  5. Turn ON the ignition, with the engine OFF.
  6. Measure the voltage from the retained accessory power (RAP) relay switch supply voltage circuit of the sunroof control module harness connector C1 to a good ground.

Does the voltage measure within the specified range?

9-16 V

Go to Step 8

Go to Step 13

8

Measure the voltage from the RAP relay switch supply voltage circuit of the sunroof control module harness connector C1 to the ground circuit of the sunroof control module harness connector C1.

Does the voltage measure within the specified range?

9-16 V

Go to Step 15

Go to Step 18

9

Test the sunroof switch. Refer to Power Sunroof Switch Test .

Is the sunroof switch OK?

--

Go to Step 10

Go to Step 16

10

  1. Turn OFF the ignition.
  2. Open the driver door.
  3. Connect the sunroof switch.
  4. Disconnect the sunroof motor.
  5. Turn ON the ignition, with the engine OFF.
  6. Connect a test lamp between the sunroof motor open control circuit of the sunroof motor harness connector and the sunroof motor close control circuit of the sunroof motor harness connector.
  7. Activate the sunroof switch to an open position.
  8. Activate the sunroof switch to a close position.

Does the test lamp illuminate when activated to the open and close positions?

--

Go to Step 17

Go to Step 14

11

Test the RAP relay switch supply voltage circuit of the sunroof control module for a short ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Step 15

12

Test the sunroof switch low reference circuit of the sunroof switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Step 15

13

Test the RAP relay switch supply voltage circuit of the sunroof control module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Retained Accessory Power (RAP) Inoperative

14

Test the sunroof motor control circuits of the sunroof motor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Step 15

15

Inspect for poor connections at the harness connectors of the sunroof control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Step 19

16

Inspect for poor connections at the harness connector of the sunroof switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Step 20

17

Inspect for poor connections at the harness connectors of the sunroof motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

Go to Step 21

18

Repair the open in the sunroof module ground circuit. Refer to Wiring Repairs and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 22

--

19

Replace the sunroof control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 22

--

20

Replace the sunroof switch. Refer to Sunroof Switch Replacement .

Did you correct the condition?

--

Go to Step 22

--

21

Important: Inspect the sunroof assembly for binding or mechanical failure.

Replace the sunroof motor. Refer to Sunroof Motor/Actuator Replacement .

Did you complete the replacement?

--

Go to Step 22

--

22

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2

Power Sunroof Inoperative one connector module

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

B+

1

1

--

--

Sunroof Enable Signal

1

1

1

--

Sunroof Switch Data 1 Signal

1

1

1

--

Sunroof Switch Data 2 Signal

1

1

1

--

Sunroof Switch Data 3 Signal

1

1

1

--

Sunroof Switch Data 4 Signal

1

1

1

--

Sunroof Switch Data 5 Signal

1

1

1

--

Sunroof Switch Data 6 Signal

1

1

1

--

Sunroof Switch Low Reference

--

1

--

--

Sunroof Module Ground

--

1

--

--

1. Power sunroof inoperative

Circuit/System Description

Battery positive voltage is supplied at all times to the sunroof control module from the SUNROOF MOD 30-A fuse located in the right rear fuse block. With the ignition in the ON or ACCESSORY positions, the sunroof enable signal circuit is pulled low by the rear integration module (RIM) allowing for sunroof operation. Once the ignition switch is turned to OFF, the sunroof will continue to operate until any door is opened or when the Retained Accessory Power (RAP) has timed out. For a complete description of RAP operation, refer to Retained Accessory Power (RAP) Description and Operation . Ground for the sunroof control module is supplied from G402.

The power sunroof is operated from the sunroof switch that is located in the over head console. The sunroof switch, when rotated to a selection, will send coded information to the sunroof module as to what position the sunroof window is to open to. The sunroof module will command the motor to open the sunroof glass to the requested position.

Diagnostic Aids
    • The sunroof control module is also referenced as the sunroof motor/actuator.
    • The sunroof motor and sunroof module are integral parts of an assembly and are not serviced separately.

Reference Information

Schematic Reference

Sunroof Schematics

Connector End View Reference

Power Roof Systems Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing

Important: Portions of the circuit/system testing require removal of the headliner. It is suggested that the sunroof switch component test is performed prior to removing the headliner.

  1. Ignition OFF, disconnect the harness connector at the sunroof switch.
  2. Interior lamps OFF, test for less than 5 ohms of resistance between the ground circuit terminal 7 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Disconnect the inline harness connector C310.
  4. Test for less than 1 ohm of resistance between the ground circuit terminal A and ground.
    5. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal C and ground.
    6. ⇒If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance
  6. Ignition ON, verify that a test lamp illuminates between the signal circuit terminal B and B+.
    7. ⇒If the test lamp does not illuminate, test the signal circuit for a short to battery or an open/high resistance. If the circuit tests normal, refer to Retained Accessory Power (RAP) Inoperative .
  7. Ignition OFF, connect the inline harness connector C310.
  8. Disconnect the harness connector at the sunroof module.
  9. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 4 and ground.
    10. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  10. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    11. ⇒If the test lamp does not illuminate, test the B+ circuit for an open/high resistance
  11. Ignition ON, verify that a test lamp illuminates between the signal circuit terminal 2 and B+.
    12. ⇒If the test lamp does not illuminate, test the signal circuit for a short to battery or an open/high resistance.
  12. Ignition OFF, connect the harness connector at the sunroof control module.
  13. Ignition ON, test for B+ between the signal circuits listed below and ground.
    14. • Sunroof switch terminal 8
    • Sunroof switch terminal 9
    • Sunroof switch terminal 10
    • Sunroof switch terminal 11
    • Sunroof switch terminal 12
    • Sunroof switch terminal 13
    ⇒If less than the specified range, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the sunroof control module.
  14. If all circuits test normal, test or replace the sunroof switch.

Component Testing

Sunroof Switch

  1. Ignition OFF, disconnect the harness connector at the sunroof switch.
  2. Test for continuity between the pins indicated for each position of the switch. The continuity should display as indicated in the test table.
    3. ⇒If not the specified value for all switch positions, test the appropriate signal circuit for a short to battery voltage. If all circuits test normal, replace the sunroof switch.

Switch Position

Pin 7 & Pin 8

Pin 7 & Pin 9

Pin 7 & Pin 10

Pin 7 & Pin 11

Pin 7 & Pin 12

Vent Position 3

0-200 ohms

Infinite

0-200 ohms

Infinite

Infinite

Vent Position 2

Infinite

Infinite

0-200 ohms

Infinite

Infinite

Vent Position 1

Infinite

Infinite

0-200 ohms

0-200 ohms

Infinite

Not Used

0-200 ohms

0-200 ohms

0-200 ohms

0-200 ohms

Infinite

Close

0-200 ohms

0-200 ohms

0-200 ohms

0-200 ohms

Infinite

Not Used

Infinite

0-200 ohms

0-200 ohms

0-200 ohms

Infinite

Roof Position 1

Infinite

0-200 ohms

Infinite

0-200 ohms

Infinite

Roof Position 2

0-200 ohms

Infinite

Infinite

0-200 ohms

Infinite

Roof Position 3

0-200 ohms

Infinite

Infinite

0-200 ohms

Infinite

Roof Position 4

Infinite

Infinite

Infinite

0-200 ohms

Infinite

Roof Position 5

Infinite

Infinite

Infinite

0-200 ohms

0-200 ohms

Roof Position 6

0-200 ohms

Infinite

Infinite

0-200 ohms

0-200 ohms

Roof Position 7

0-200 ohms

0-200 ohms

Infinite

0-200 ohms

0-200 ohms

Roof Position 8

Infinite

0-200 ohms

Infinite

0-200 ohms

0-200 ohms

Roof Position 9

Infinite

0-200 ohms

0-200 ohms

0-200 ohms

0-200 ohms

Roof Position 10

0-200 ohms

0-200 ohms

0-200 ohms

0-200 ohms

0-200 ohms

Roof Position 11

0-200 ohms

Infinite

0-200 ohms

0-200 ohms

0-200 ohms

Roof Position 12

Infinite

Infinite

0-200 ohms

0-200 ohms

0-200 ohms

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Sunroof Switch Replacement
    •  Control Module References for sunroof motor/actuator replacement, programming, and setup