B1846
B1846-SUNROOF VENT SWITCH CIRCUIT/PERFORMANCE HIGH
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, there is a short to voltage, a short to ground or an open 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 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 using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
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. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT 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 connector.
3. Disconnect the Sunroof Motor/Module connector.
NOTE: Ensure 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 volts?
Yes
- Repair the (Q4) Sunroof Vent Switch Sense circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 4
4. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO GROUND
NOTE: Ensure the A-Pillar connector is connected before proceeding.
1. Turn the ignition off.
2. Measure the resistance between ground and the (Q4) Sunroof Vent Switch Sense circuit in the Sunroof Motor/Module harness connector.
Is the voltage above 0.4 volts?
Yes
- Repair the (Q4) Sunroof Vent Switch Sense circuit for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 5
5. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT OPEN
NOTE: Ensure the A-Pillar connector is connected before proceeding.
1. Measure the resistance of the (Q4) Sunroof Vent 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 (Q4) Sunroof Vent Switch Sense circuit for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
No
- Go To 6
6. (Q4) SUNROOF VENT SWITCH SENSE CIRCUIT SHORT TO (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 - 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