• 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.

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.

The ignition is ON.

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

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

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

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

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

Sunroof Schematics

Master Electrical Component List

Sunroof Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A98 Front Overhead Console Assembly. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 Ω between the low reference circuit terminal 20 and ground.
• If 10 Ω or greater
1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for less than 2 Ω in the low reference circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω , test or replace the K61 Sunroof Control Module.
• If less than 10 Ω
3. Ignition ON.
4. Test for 4.5–5.5 V between the 5 V reference circuit terminal 9 and ground.
• If less than 4.5 V
1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 Ω in the 5 V reference circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the K61 Sunroof Control Module.
• If greater than 5.5 V
1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K61 Sunroof Control Module.
• If between 4.5–5.5 V
5. Test or replace the A98 Front Overhead Console Assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• Roof Console Replacement
• Control Module References for sunroof motor/actuator replacement, programming and setup