Module-Steering Column
WARNING:
To service any component of the SCCM, the entire assembly must be removed from the column. This must be done due to the clockspring passing through the assembly and into the self docking connector. Failure to remove the assembly could damage the pins of the clockspring and prevent the airbag system from operating properly.
The Steering Control Module (SCM) communicates via the Local Interconnect Network (LIN) serial data bus to the steering wheel switches and the horn switch. The SCM communicates across the Can C and Can B. This is an ultra-low voltage serial data bus that allows the following components to communicate with the Controller Area Network (CAN) B and C data buses.
| Function | Input | Output |
| Steering Wheel Switch | Direct to SCM on LIN Bus | SCM output to Can B BUS |
| Horn Switch | Direct to SCM on LIN Bus | SCM output to Can B BUS |
| Multi Function Switch | Direct input to the SCM. | SCM output to Can B BUS |
| Tilt/Telescopic Switch | Direct input to the SCM | SCM output to Can B BUS |
| Steering angle sensor | Direct input to the SCM | SCM output to Can C BUS |
| Speed Control Switch ( steering wheel mounted) | Direct input to the SCM | SCM output to Can C BUS |
| Speed control switch ( Police Package LE/L2) | Direct input to the SCM | SCCM output to Can C BUS |
The SCM changes the LIN communication to CAN communication and also stores Diagnostic Trouble Codes (DTCs) for the switches within the SCCM and on the steering wheel.
For removal and installation, disassembly and assembly of the SCCM, refer to the following:
NOTE:
For Steering Column Module (SCM) removal and installation, refer to the disassembly and assembly procedures for the Steering Column Control Module (SCCM).
- Removal of SCCM. Refer to REMOVAL .
- Disassembly of SCCM. Refer to DISASSEMBLY .
- Assembly of SCCM. Refer to ASSEMBLY .
- Installation of the SCCM. Refer to INSTALLATION .
The SCM is not serviceable and if found faulty, it must be replaced as a unit.