Diagnostic Instructions
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
Scan Tool Reference
Control Module References
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the steering wheel switch.
- 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. |
- 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. |
- If all circuits test normal, replace the steering wheel switch.
Component Testing
- Ignition OFF, disconnect the harness connector at the steering wheel switch.
- 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. |
- 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. |
- 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. |
- 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. |
- 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
