B1847

B1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGH





For a complete wiring diagram, refer to the Wiring Information. Electrical Diagrams

Theory of Operation

The Sunroof Motor/Module supplies a 12 Volt supply circuit to the sunroof switch. When the switch is closed to any of the three sense circuits (open, close or vent), it sends that command back to the module.

- When Monitored:
Whenever the Sunroof module is awake.

- Set Condition:
Whenever the module has determined that the vent switch has been applied for over 15 seconds or there is a short to voltage on the Sunroof Vent Switch Sense circuit, this code will set.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase the DTCs.
3. Press and release the Sunroof Switch in all positions several times.
4. Wait 30 seconds.
5. With the scan tool, read the active DTCs.

Does the scan tool display B1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGH as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Check the switch for any binding conditions and using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. SUNROOF SWITCH SHORTED




1. With the scan tool, erase the DTCs.
2. Turn the ignition off.
3. Disconnect the Sunroof Switch connector.
4. Turn the ignition on and wait 30 seconds.
5. With the scan tool, read the active DTCs.

Does the scan tool display B1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGH as active?

Yes

- Go To 3

No

- Replace the Sunroof Switch.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE





NOTE: To further diagnose the sunroof, it is necessary to lower or remove the headliner.

1. Turn the ignition off.
2. Lower the headliner to gain access to the Sunroof Motor/Module connector.
3. Disconnect the Sunroof Motor/Module connector.

NOTE: Make sure the A-Pillar and all inline sunroof connectors are connected before proceeding.

4. Turn the ignition on.
5. Measure the voltage between the (Q4) Sunroof Vent Switch Sense circuit and Ground.

Is there any voltage present?

Yes

- Repair the (Q4) Sunroof Vent Switch Sense circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORTED TO THE (Q6) SUNROOF SWITCH SUPPLY CIRCUIT




1. Turn the ignition off.
2. Measure the resistance between the (Q4) Sunroof Vent Switch Sense circuit and the (Q6) Sunroof Switch Supply circuit in the Sunroof Motor/Module connector.

Is the resistance below 10k ohms?

Yes

- Repair the (Q4) Sunroof Vent Switch Sense circuit for a short to the (Q6) Sunroof Switch Supply circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Sunroof Motor/Module.
- Programming and Relearning Perform the SUNROOF POSITION CALIBRATION procedure. Sunroof Position Calibration
- Programming and Relearning Perform the EXCESSIVE FORCE LIMITATION (EFL) CALIBRATION procedure. Excessive Force Limitation (EFL) Calibration
- Perform the BODY VERIFICATION TEST. Body Verification Test.