Diagnostic Instructions

DTC Descriptor

DTC B3664 02: Sunroof Position Select Switch High Signal Circuit Short to Ground

DTC B3664 05: Sunroof Position Select Switch High Signal Circuit Open/Short to Voltage

DTC B3664 59: Sunroof Position Select Switch High Signal Circuit Protection Timeout

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Sunroof Position Select Switch Control	B3664 02	B3664 05	B3664 05	--
Sunroof Position Select Switch Low Reference	--	1	1	--
1. Power Sunroof/Sunshade Malfunction

Circuit/System Description

The sunroof position select switch is connected directly to the controller. The sliding glass switch provide detent positions for open, express open, off, close, and express close. The sunroof position select switch completes the circuit between two signals provided by the control module, a reference ground input and a pull-up voltage provided by an analog to digital switch input. The control switch places a different resistor ladder network in the circuit depending on the function selected.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

B3664 02

The sunroof module has detected and reported via the LIN-Bus that the sunroof position select switch high signal circuit is shorted to ground.

B3664 05

The sunroof module has detected and reported via the LIN-Bus that the sunroof position select switch high signal circuit is open or shorted to voltage.

B3664 59

The sunroof module has detected and reported via the LIN-Bus that the sunroof position select switch high signal has been the same active position for 20 s after the glass has stopped moving in the requested direction due to reaching the end of the allowable motion.

Action Taken When the DTC Sets

DTC B3664 is stored in the body control module (BCM) memory.

Conditions for Clearing the DTC

The BCM no longer detects a malfunction in the sunroof position select switch high signal circuit.

Reference Information

Schematic Reference

Sunroof Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Sunroof Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Note: Because of the accessibility of the sunroof switch, perform the component testing before beginning the Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the S72 Sunroof Switch.
2. Test for less than 5 Ω between the ground circuit terminal 1 and ground.

⇒	If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool sunroof switch is Inactive.

⇒	If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K61 Sunroof Control Module.

4. Install a 5 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 1. Verify the scan tool sunroof switch is short to ground.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K61 Sunroof Control Module.

5. If all circuits test normal, test or replace the S72 Sunroof Switch.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the S72 Sunroof Switch.
2. Test for 460-480 kΩ between the switch terminals 1 and 4.

⇒	If not within the specified range, replace the S72 Sunroof Switch.

3. Test for 230-250 Ω between the signal terminal 1 and the low reference circuit terminal 4 while pressing the open switch.

⇒	If not within the specified range, replace the S72 Sunroof Switch.

4. Test for 75-95 Ω between the signal terminal 1 and the low reference circuit terminal 4 while pressing the express open switch.

⇒	If not within the specified range, replace the S72 Sunroof Switch.

5. Test for 410-430 Ω between the signal terminal 1 and the low reference circuit terminal 4 while pressing the close switch.

⇒	If not within the specified range, replace the S72 Sunroof Switch.

6. Test for 330-350 Ω between the signal terminal 1 and the low reference circuit terminal 4 while pressing the express close switch.

⇒	If not within the specified range, replace the S72 Sunroof Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.