For 1990-2009 cars

### Diagnostic Instructions

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

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

• | Diagnostic Procedure Instructionsprovides an overview of each diagnostic category

### DTC Descriptors

DTC B2815 04: Steering Wheel Switch Open Circuit
DTC B2815 59: Steering Wheel Switch Stuck

### Circuit/System Description

The control buttons located on the steering wheel provide remote operation of various system functions. When a button is pressed, the change in resistance is interpreted by the Instrument Panel Cluster (IPC) as a button press, and the appropriate function is activated.

### Conditions for Running the DTC

• | System voltage is between 9-16 volts.

• | Ignition switch is in the ON position.

### Conditions for Setting the DTC

#### DTC B2815 04

The IPC detects a steering wheel switch open circuit (greater than 4.8 volts on encoded switch input) for more than 5 seconds.

#### DTC B2815 59

The IPC detects a stuck steering wheel switch (0.2-4 volts on encoded switch input) for more than 3 minutes.

### Action Taken When the DTC Sets

• | The IPC will not acknowledge driver requested inputs from the steering wheel switch.

• | A stuck steering wheel switch will be unable to send driver requests to the IPC.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present.

• | The DTC can be cleared using a scan tool.

### Diagnostic Aids

If DTC B2815 59 is set the steering wheel switch component test should be performed prior to continuing with circuit/system testing below.

### Reference Information

#### Schematic Reference

Instrument Cluster Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the steering wheel switch.
2. Ignition ON, test for voltage between the encoded switch input circuit and a known ground.

⇒ | If voltage is below 4.8 volts, test the encoded switch input circuit for a short to ground or an open/high resistance, if circuit tests normal replace the IPC.

⇒ | If voltage is above 4.8 volts, test the encoded switch input circuit for a short to voltage, if circuit tests normal replace the IPC.

3. Ignition ON, test for less than 1.0 ohm of resistance between the encoded switch return circuit and ground.

⇒ | If greater than the specified range, test the encoded switch return circuit for an open/high resistance. If the circuit tests normal, replace the IPC.

4. If all circuits test normal, replace the steering wheel switch.

### Component Testing

1. Ignition OFF, disconnect the harness connector at the steering wheel switch.
2. Test for 7.2K ohms between the encoded switch input and encoded switch return terminals with the steering wheel switch in the open position.

⇒ | If not the specified value, replace the steering wheel switch.

3. Test for 102 ohms between the encoded switch input and encoded switch return terminals with the steering wheel switch in the mute position.

⇒ | If not the specified value, replace the steering wheel switch.

4. Test for 253 ohms between the encoded switch input and encoded switch return terminals with the steering wheel switch in the phone position.

⇒ | If not the specified value, replace the steering wheel switch.

5. Test for 660 ohms between the encoded switch input and encoded switch return terminals with the steering wheel switch in the audio position.

⇒ | If not the specified value, replace the steering wheel switch.

6. Test for 1K ohm between the encoded switch input and encoded switch return terminals with the steering wheel switch in the trip position.

⇒ | If not the specified value, replace the steering wheel switch.

### Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming