B1844

B1844-SUNROOF CLOSE SWITCH INPUT CIRCUIT HIGH





For a complete wiring diagram Refer to Diagrams/Electrical.

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 close switch has been applied for over 15 seconds or there is a short to voltage on the Sunroof Close Switch Sense circuit, this code will set.





Diagnostic Test

1.TEST FOR INTERMITTENT CONDITION

Turn the ignition on.

With the scan tool, record and erase DTC's

Press and release the Sunroof Switch in all positions several times.

Wait 30 seconds.

With the scan tool, read DTC's.

Does the scan tool display B1844-SUNROOF CLOSE 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





With the scan tool, erase DTC's.

Turn the ignition off.

Disconnect the Sunroof Switch connector.

Turn the ignition on and wait 30 seconds.

With the scan tool, read DTC's.

Does the scan tool display B1844-SUNROOF CLOSE SWITCH INPUT CIRCUIT HIGH?

Yes

- Go To 3

No

- Replace the Sunroof Switch.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3.(Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE





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

Turn the ignition off.

Lower the headliner to gain access to the Sunroof Motor/Module connector.

Disconnect the Sunroof Motor/Module connector.

NOTE: Ensure the A-Pillar connector is connected before proceeding.

Turn the ignition on.

Measure the voltage between the (Q5) Sunroof Close Switch Sense circuit and Ground.

Is the voltage above 0.4 volts?

Yes

- Repair the (Q5) Sunroof Close Switch Sense circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 4

4.(Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT





Turn the ignition off.

Disconnect the A-Pillar connector.

Measure the resistance between the (Q5) Sunroof Close 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 (Q5) Sunroof Close Switch Sense circuit for a short to the (Q6) Sunroof Switch Supply circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Sunroof Motor/Module.
- Perform the Sunroof Position Calibration.
Perform the Excessive Force Limitation Calibration.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test