B1847

B1847-SUNROOF VENT SWITCH INPUT CIRCUIT HIGH





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

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 3 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. Using the scan tool, record and erase DTCs
3. Press and release the Sunroof Switch in all positions several times.
4. Wait 30 seconds.
5. Using the scan tool, read DTCs.

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

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Check the switch for any binding conditions and using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2. SUNROOF SWITCH SHORTED




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

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

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 connector is connected before proceeding.

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

Is the voltage above 0.4 of a Volt?

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. Disconnect the A-Pillar connector.
3. 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 1000.0 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.
- Perform the Motor/Module Initialization procedure. Programming and Relearning.
- Perform the BODY VERIFICATION TEST. Body Verification Test.