Checking the Cruise Control Switch

Checking the cruise control switch

Checking components and wiring
Ignition off.
Ignition on.
Read off the status of the buttons in the cruise control switch.
If the cruise control switch is functioning the fault is outside the steering wheel module.





Is the cruise control switch working?

Yes - No Fault Found

No - Car equipment

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Car equipment

Is the car equipped with RTI?

Yes - Checking components and wiring

No - Checking components and wiring

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Checking components and wiring




- Ignition off
- Disconnect the RTI switch
- Ignition on.
Activate and read off the status of the buttons in the audio / carphone switch.
If the readings give a correct result, the fault is in the RTI switch.

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





Was the audio / carphone switch status OK?

Yes - Fault Found

No - Checking components and wiring

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Checking components and wiring




- Ignition off
- Disconnect the audio / carphone switch by disconnecting the lower connector on the audio / carphone switch
- Ignition on.
Activate the buttons. Read off the status of the buttons in the cruise control switch
If the readings give a correct result, the fault is in the audio / carphone switch.

Other information:
- To access the audio / carphone switch, see the relevant service procedure.





Was the status of the cruise control switch OK?

Yes - Fault Found

No - Checking components and wiring

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Checking components and wiring




- Ignition off
- Disconnect the audio / carphone wiring by disconnecting the lower connector on the cruise control switch
- Ignition on.
Activate the buttons. Read off the status of the buttons in the cruise control switch
If the readings give a correct result, the fault is in the wiring between the audio / carphone switch and the cruise control switch.

Other information:
- To access the cruise control switch, see the relevant service procedure.





Was the status of the cruise control switch OK?

Yes - Fault Found

no - Checking components and wiring

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Checking components and wiring
Check the voltage between terminals #B1 and #B3. Voltage should be approximately 12 V.
Check the voltage between terminals #B2 and #B3. Voltage should be approximately 5 V.
Check the voltage between terminal #B3 and the battery negative terminal. Voltage should be approximately 0 V.
If the above readings are OK, the fault is in the cruise control switch.

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









Was a fault detected?

Yes - Fault Found

No - No Fault Found

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