Circuit Description
The steering wheel controls are simple momentary contact switches that connect a series of resistors so that each switch selection corresponds to a fixed resistance value. The dash integration module (DIM) determines which switch has been pressed by the voltage drop across the corresponding resistance value.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2805 Steering Wheel Controls HVAC Switch Circuit Malfunction
Conditions for Running the DTC
The DIM must be powered.
Conditions for Setting the DTC
One of the HVAC switches must be active (stuck) for at least 30 seconds.
Action Taken When the DTC Sets
The DIM will disable all of the steering wheel control switches while the fault is present.
Conditions for Clearing the DTC
| • | The DTC will become history if the DIM no longer detects a failure. |
| • | The history DTC will clear after 50 fault-free ignition cycles. |
| • | The DTC can be cleared with a scan tool. |
Diagnostic Aids
Switch Position | Counts |
|---|---|
No Input | 0 |
TEMP DOWN | 136 |
TEMP UP | 162 |
FAN DOWN | 81 |
FAN UP | 108 |
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool indicate that the counts are within the specified range? | 0-7 Counts | Go to Diagnostic Aids | Go to Step 3 | |
3 | Replace the steering wheel controls. Refer to Steering Wheel HVAC Control Assembly Replacement . Did you complete the replacement? | -- | Go to Step 4 | -- |
4 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
