B1843

B1843-SUNROOF CLOSE SWITCH CIRCUIT/PERFORMANCE



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, there is a short to voltage, a short to ground or an open on the Sunroof Open 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 DTC's
3. Press and release the Sunroof Switch in all positions several times.
4. Wait 30 seconds.
5. With the scan tool, read DTC's.

Does the scan tool display this DTC as active?

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 repair any obvious problems. If no obvious problems were found, use the wiring diagram/schematic as a guide and inspect the wiring and connectors for an intermittent condition.

2. SUNROOF SWITCH SHORTED
1. With the scan tool, erase DTC's.
2. Turn the ignition off.
3. Disconnect the Sunroof Switch harness connector.
4. Turn the ignition on and wait 30 seconds.
5. With the scan tool, read DTC's.

Does the scan tool display this DTC as active?

Yes

- Go To 3

No

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

3. CHECK THE (Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT FOR A SHORT 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 harness connector.
3. Disconnect the Sunroof Motor/Module harness connector.

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

4. Turn the ignition on.
5. Measure the voltage of the (Q5) Sunroof Close Switch Sense circuit in the Sunroof Motor/Module harness connector.

Is the voltage above 0.4 volts?

Yes

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

No

- Go To 4

4. CHECK THE (Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.

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

2. Measure the resistance between ground and the (Q5) Sunroof Close Switch Sense circuit in the Sunroof Motor/Module harness connector.

Is the resistance above 10,000 ohms?

Yes

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

No

- Go To 5

5. CHECK THE (Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT FOR AN OPEN
1. Turn the ignition off.

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

2. Measure the resistance of the (Q5) Sunroof Close Switch Sense circuit between the Sunroof Switch harness connector and the Sunroof Motor/Module harness connector.

Is the resistance below 5.0 ohms?

Yes

- Repair the (Q5) Sunroof Close Switch Sense circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 6

6. CHECK THE (Q5) SUNROOF CLOSE SWITCH SENSE CIRCUIT FOR A SHORT TO (Q6) SUNROOF SWITCH SUPPLY CIRCUIT
1. Turn the ignition off.
2. Disconnect the A-Pillar connector.
3. Measure the resistance between the (Q5) Sunroof Close Switch Sense circuit and the (Q6) Sunroof Switch Supply circuit in the Sunroof Motor/Module harness 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 the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Sunroof Motor/Module.
- Perform the DRIVE MOTOR TEACH PROCEDURE, Programming and Relearning.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test