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 B369C 02: Sunroof Ventilation Position Select Switch Circuit Short to Ground
DTC B369C 05: Sunroof Ventilation Position Select Switch Circuit Open or High Voltage
DTC B369C 59: Sunroof Ventilation Position Select Switch Circuit Protection Time-out

### Circuit/System Description

The sunroof ventilation position select switch is connected directly to the controller and provide detent positions for open, off and close. The control 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 control 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 module has detected and reported via the LIN-Bus that the sunroof ventilation position select switch circuit is shorted to ground.

#### B369C 05

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

#### B369C 59

The sunroof module has detected and reported via the LIN-Bus that the sunroof ventilation position select switch 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 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 ventilation position select switch 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

1. Ignition OFF, disconnect the harness connector at the S88 Sunroof Ventilation 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 tilt 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 tilt 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 S88 Sunroof Ventilation Switch.

### Component Testing

#### Static Test

1. Ignition OFF, disconnect the harness connector at the S88 Sunroof Ventilation Switch.
2. Test for 460-480 kΩ between the switch terminals 1 and 4.

⇒ | If not within the specified range, replace the S88 Sunroof Ventilation 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 S88 Sunroof Ventilation Switch.

4. 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 S88 Sunroof Ventilation 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.