Checking the RTI Switch Unit

Checking the RTI switch unit

Checking the wires and components




- Ignition off.
- Disconnect RTI switch unit.
- Ignition on.
Activate buttons and read status on audio/telephone switch unit buttons.
If read-out gave a correct result the fault is in the RTI switch unit.

Additional information:
- To access RTI switch unit, see the relevant service procedure.





Did read-out of status on audio/telephone switch unit give a correct result?

Yes - Fault Found

No - Checking the wires and components

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Checking the wires and components




- Ignition off.
- Disconnect audio/telephone switch unit by loosening the lower connector on the audio/telephone switch unit.
- Ignition on.
Activate buttons and read status on cruise-control switch unit buttons.
If read-out gave a correct result the fault is in the audio/telephone switch unit.

Additional information:
- To access audio/telephone switch unit, see the relevant service procedure.





Did read-out of status on cruise-control switch unit give a correct result?

Yes - Fault Found

No - Checking the wires and components

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Checking the wires and components




- Ignition off.
- Disconnect cable to audio/telephone by loosening the lower connector on the cruise-control switch unit.
- Ignition on.
Activate buttons and read status on cruise-control switch unit buttons.
If read-out gave a correct result the fault is in the cable between the audio/telephone switch unit and cruise-control switch unit.

Additional information:
- To access cruise control switch unit see the relevant service procedure.





Did read-out of status on cruise-control switch unit give a correct result?

Yes - Fault Found

No - Checking the wires and components

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Checking the wires and components
Check the voltage between B1 and B3. The voltage should be approximately 12V.
Check the voltage between B2 and B3. The voltage should be approximately 5V.
Check voltage between B3 and battery negative lead. The voltage should be approximately 0V.
If voltages measured above are OK, the fault is in the cruise-control switch unit.

Additional information:
- To connect the test box, see Connecting the breakout box Connecting the Breakout Box, Steering Wheel Module (SWM)









Is there a fault?

Yes - Fault Found

No - No Fault Found

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