Circuit Description
The steering column tilt/telescoping module (SCM) receives an input from the tilt/telescope switch when the switch is pressed. The SCM recognizes this input and supplies battery voltage and ground to the tilt motor up or down circuit, or to the telescope motor in or out circuit, depending on which direction of movement is requested. Both motors are reversible and the voltage and ground applied to the circuits is simply reversed to accomplish movement in opposite directions.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2904 Tilt and Telescope 4-Way Position Switch Circuit Low
Conditions for Running the DTC
With the ignition switch ON, the SCM checks the switch inputs every 30 seconds regardless of source voltage.
Conditions for Setting the DTC
When the SCM detects 2 simultaneous inputs for more than 2 seconds, the module considers the inputs invalid and sets the DTC.
Action Taken When the DTC Sets
| • | The SCM no longer moves the steering column in the direction of the invalid inputs. |
| • | The SCM continues to respond to inputs from the other manual switches. |
Conditions for Clearing the DTC
The SCM no longer receives 2 simultaneous switch inputs.
Diagnostic Aids
An intermittently stuck switch can cause this DTC to set. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Tilt/Telescoping Steering Column Schematics Connector End View Reference: Steering Wheel and Column 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 |
2 |
Is DTC B2904 displayed as current? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Is DTC B2904 displayed as current? | Go to Step 4 | Go to Step 5 |
4 | Inspect for poor connections at the harness connector of the tilt/telescoping steering column switch. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
5 | Replace the tilt/telescoping steering column switch. Refer to Telescope Actuator Switch Replacement . Did you complete the replacement? | Go to Step 7 | -- |
6 |
Important: Perform the set up procedure for the tilt/telescoping steering column control module. Replace the control module. Refer to Steering Column Control Module Replacement . Did you complete the replacement? | Go to Step 7 | -- |
7 | Perform the Steering Column Control Module Programming. Refer to Steering Column Control Module Programming . Did you complete the action? | Go to Step 8 | -- |
8 |
Does DTC B2904 reset? | Go to Step 2 | System OK |
