Chevrolet Trax: DTC B369C: Sunroof tilt position select switch

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 Descriptors

DTC B369C 02

Sunroof Tilt Position Select Switch Circuit Short to Ground

DTC B369C 05

Sunroof Tilt Position Select Switch Circuit High Voltage/Open

DTC B369C 59

Sunroof Tilt Position Select Switch Circuit Protection Time-Out

Diagnostic Fault Information

Circuit/System Description

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

The controllers analog to digital switch input reads the resulting voltage range and determines the function.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

B369C 02

The sunroof control module has detected and reported via serial data that the sunroof tilt switch circuit is shorted to ground.

B369C 05

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

B369C 59

The sunroof control module has detected and reported via serial data that the sunroof tilt switch 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.

Action Taken When the DTC Sets

DTC B369C is stored in the body control module (BCM) memory.

Conditions for Clearing the DTC

The BCM no longer detects a malfunction in the sunroof tilt switch circuit.

Reference Information

Schematic Reference

Sunroof Schematics (Encore), Sunroof Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

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

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 1 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms , test or replace the K61 Sunroof Control Module.
• If less than 10 ohms

3. Ignition ON.
4. Verify the scan tool Sunroof Tilt Switch parameter is Short to Battery.

• If not Short to Battery

1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for infinite resistance between the signal circuit terminal 4 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K61 Sunroof Control Module.
• If Short to Battery

5. Install a 5 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 1.
6. Verify the scan tool Sunroof Tilt Switch parameter is Short to Ground.

• If not Short to Ground

1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for less than 1 V between the signal circuit terminal 4 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K61 Sunroof Control Module.
• If Short to Ground

7. All OK.

Component Testing

Sunroof Ventilation Switch

Static Test

1. Ignition OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch.
2. Test for 830-1030 ohms between the control terminal 4 and the low reference terminal 1.

• If not between 830-1030 ohms

Replace the S88 Sunroof Tilt Switch.

• If between 830-1030 ohms

3. Test for 88-120 ohms between the control terminal 4 and the low reference terminal 1 while pressing the open switch.

• If not between 88-120 ohms

Replace the S88 Sunroof Tilt Switch.

• If between 88-120 ohms

4. Test for 390-480 ohms between the control terminal 4 and the ground terminal 1 while pressing the close switch.

• If not between 390-480 ohms

Replace the S88 Sunroof Tilt Switch

• If between 390-480 ohms

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Sunroof Switch Replacement
• Sunroof Module Assembly Replacement
• Control Module References for sunroof control module replacement, programming and setup

SYMPTOMS - ROOF

IMPORTANT: The following steps must be completed before using the symptom tables.

1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:

• There are no DTCs set.
• The control modules can communicate via the serial data links.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Sunroof Description and Operation.

Visual/Physical Inspection

• Inspect for aftermarket devices which could affect the operation of the systems. Refer to Checking Aftermarket Accessories .
• Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to Power Sunroof Malfunction in order to diagnose the symptom.

POWER SUNROOF MALFUNCTION

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.

Diagnostic Fault Information

Circuit/System Description

The sunroof electrical system uses a master/slave configuration utilizing a serial data based system for communication. The body control module (BCM) is designated as the master, while the sunroof control modules is configured as the slave.

As the system master, the BCM uses the serial data communication bus to enable or disable sunroof operation, communicate vehicle information to each controller, and request sunroof movement. The sunroof control module provides system status and diagnostic information to the BCM for diagnostic reporting and operational purposes. The control switches places a different resistor ladder network in the circuit depending on the function selected. The controllers analog to digital switch input reads the resulting voltage range and determines the function.

Diagnostic Aids

• The sunroof glass is controlled by an integrated motor/controller containing the motor, electronics, and position sensors. If the motor and sunroof mechanism get out of sync the sunroof may operate erratically.

  To re-synchronize the motor and sunroof mechanism, perform the Sunroof Motor/Actuator Initialization/Teach Process.

• The sunroof control module provides obstacle/blockage detection. If the Sunroof Motor/Actuator Initialization/Teach Process is not carried out completely, the sunroof may stop and reverse slightly when it gets to the location where it needs to push down the windscreen. Make sure to complete the process.

Reference Information

Schematic Reference

Sunroof Schematics (Encore), Sunroof Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

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 Verification

1. Ignition ON.
2. Verify the sunroof opens and closes when pressing the open and close sunroof switch.

• If the sunroof does not open or close

Refer to Circuit/System Testing.

• If the sunroof opens and closes

3. Verify the sunroof opens and closes to the vent position when pressing the open and close sunroof vent switch.

• If the sunroof does not open or close to the vent position

Refer to Circuit/System Testing - Vent Malfunction.

• If the sunroof opens and closes to the vent position

4. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K61 Sunroof Control Module. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground.

If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

3. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

• If test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K61 Sunroof Control Module.
• If the test lamp illuminates

4. Ignition ON.
5. Test for less than 1 V between the signal circuit terminals listed below and ground:

• Terminal 3 - K61 Sunroof Control Module
• Terminal 5 - K61 Sunroof Control Module
• Terminal 6 - K61 Sunroof Control Module
• If 1 V or greater

Repair the short to voltage on the signal circuit.

• If less than 1 V

6. Ignition OFF.
7. Test for infinite resistance between the signal circuit terminals listed below and ground:

• Terminal 3 - K61 Sunroof Control Module
• Terminal 5 - K61 Sunroof Control Module
• Terminal 6 - K61 Sunroof Control Module
• If less than infinite resistance

Repair the short to ground on the signal circuit

• If infinite resistance

8. Disconnect the harness connector at the S72 Sunroof Switch and the S88 Sunroof Tilt Switch.
9. Test for less than 5 ohms between the circuit terminals listed below:

• S72 Sunroof Switch terminal 1 and K61 Sunroof Control Module terminal 3
• S72 Sunroof Switch terminal 4 and K61 Sunroof Control Module terminal 5
• S88 Sunroof Tilt Switch terminal 1 and K61 Sunroof Control Module terminal 3
• S88 Sunroof Tilt Switch terminal 4 and K61 Sunroof Control Module terminal 6
• If greater than 5 ohms

Repair the open/high resistance in the circuit.

• If less than 5 ohms

10. Test or replace the K61 Sunroof Control Module.

Tilt Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 1 and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms , test or replace the K61 Sunroof Control Module.
• If less than 10 ohms

3. Ignition ON.
4. Verify the scan tool Sunroof Tilt Switch parameter is Short to Battery.

If not Short to Battery

1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for infinite resistance between the signal circuit terminal 4 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K61 Sunroof Control Module.
• If Short to Battery

5. Install a 5 A fused jumper wire between the signal circuit terminal 4 and the low reference circuit terminal 1.
6. Verify the scan tool Sunroof Tilt Switch parameter is Short to Ground.

• If not Short to Ground

1. Ignition OFF, disconnect the harness connector at the K61 Sunroof Control Module.
2. Test for less than 1 V between the signal circuit terminal 4 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K61 Sunroof Control Module.
• If Short to Ground

7. All OK.

Component Testing

Sunroof Switch - Static Test

1. Ignition OFF, disconnect the harness connector at the S72 Sunroof Switch.
2. Test for 3.3-4.0k ohms between the control terminal 4 and the low reference terminal 1.

• If not between 3.3-4.0k ohms

Replace the S72 Sunroof Switch.

• If between 3.3-4.0k ohms

3. Test for 390-480 ohms between the control terminal 4 and the low reference terminal 1 while pressing the open switch.

• If not between 390-480 ohms

Replace the S72 Sunroof Switch.

• If between 390-480 ohms

4. Test for 88-120 ohms between the control terminal 4 and the low reference terminal 1 while pressing the express open switch.

• If not between 88-120 ohms

Replace the S72 Sunroof Switch.

• If between 88-120 ohms

5. Test for 1.6-2.0k ohms between the control terminal 4 and the low reference terminal 1 while pressing the close switch.

• If not between 1.6-2.0k ohms

Replace the S72 Sunroof Switch

• If between 1.6-2.0k ohms

6. Test for 830-1030 ohms between the control terminal 4 and the low reference terminal 1 while pressing the express close switch.

• If not between 830-1030 ohms

Replace the S72 Sunroof Switch.

• If between 830-1030 ohms

7. All OK

Sunroof Tilt Switch - Static Test

1. Ignition OFF, disconnect the harness connector at the S88 Sunroof Tilt Switch.
2. Test for 830-1030 ohms between the control terminal 4 and the low reference terminal 1.

• If not between 830-1030 ohms

Replace the S88 Sunroof Tilt Switch.

• If between 830-1030 ohms

3. Test for 88-120 ohms between the control terminal 4 and the low reference terminal 1 while pressing the open switch.

• If not between 88-120 ohms

Replace the S88 Sunroof Tilt Switch.

• If between 88-120 ohms

4. Test for 390-480 ohms between the control terminal 4 and the ground terminal 1 while pressing the close switch.

• If not between 390-480 ohms

Replace the S88 Sunroof Tilt Switch.

• If between 390-480 ohms

5. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Sunroof Switch Replacement
• Sunroof Tilt Position Switch Replacement
• Control Module References for sunroof control module replacement, programming and setup

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