For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### 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.

• | Sunroof Switch Replacement

• | Sunroof Module Assembly Replacement

• | Control Module References for sunroof motor/actuator replacement, setup, and programming.