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HOMESERVICE MANUALSDODGE AND RAM20241500 TRXREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 91 ((STEERING CONTROL MODULE (SCM) - ELECTRICAL DIAGNOSTICS - 1500 CLASSIC))DIAGNOSIS AND TESTINGU1009-00-LIN 2 BUSTHEORY OF OPERATION
2024 Dodge and Ram 1500 TRX

Theory Of Operation

2024 Dodge and Ram 1500 TRXSECTION Theory Of Operation
WARNING: This page is about a different car, the 2023 RAM 1500 Classic. However, it is still accessible from the selected car via links, so may be relevant.

The Right Steering Wheel Control Switch (Speed Control Switch) includes the Speed Control functions. The Right Steering Wheel Control Switch sends resistor multiplex (MUX) outputs to the Steering Column Module (SCM), indicating specified switch commands. The Right Steering Wheel Control Switch also contains the Local Interface Network (LIN) slave node and communicates the selected states of the Speed Control switch over the LIN Bus circuit to the SCM, which is the LIN master node and a gateway to the Controller Area Network (CAN) Bus network.

U1009-00-LIN BUS 2 FAULT 

This fault is set when the Steering Column Control Module (SCCM) does not receive signals from the Right Steering Wheel Control switch. In this situation, the Right Steering Wheel Control Switch (Speed Control Switch) is either:

  • Sending signals over the LIN BUS, but a wiring concern (Short or Open circuit)is preventing the signal from reaching the SCCM.
  • Not sending signals over the LIN BUS due to the Right Steering Wheel Control switch not powering up due to power related concerns or a general defect of the switch.
  • Sending signals or the LIN BUS with no issues in the switch or the wiring, but the issue lies with the SCCM.

Search for Technical Service Bulletins (TSBs) and Star Online (SOL) cases related to these DTCs.

Use the following diagnostics to determine the concern.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.