Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFF

Do this diagnosis if a component that is controlled by the B-CAN system does not stop or turn off.

NOTE: 

• If the component does not turn on, go to B-CAN System Diagnosis Test Mode D .
• See the B-CAN system unit input/output index for a list of input and output devices and the control units that monitor the input and control the output devices.

1. Check for DTCs by selecting the system MODE MENU from the HDS.

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  If any DTCs are indicated, go to B-CAN System Diagnosis Test Mode A .

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  If any DTCs are not indicated, go to step 2.

2. Turn off the switch that controls the malfunctioning component.

3. Select the applicable system from the system MODE MENU, then select DATA LIST, and check the input of the switch that controls the related component.

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  If HDS indicates the switch is OFF, go to step 4.

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  If HDS indicates the switch is not OFF, go to step 6.

4. In the DATA LIST, check the output signal of the malfunctioning component.

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  If the output signal is OFF, go to step 5.

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  If the output signal is not OFF, replace the control unit that controls the device that will not turn OFF.

5. Check the relay that does not stop or turn off, if applicable, then check for a short in the wire between the relay and the component, the relay and control unit, or the component and control unit.

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  If the relay and the wire harness are OK, replace the control unit that controls the component that will not stop or turn OFF.

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  If the relay and the wire harness are not OK, replace the relay or repair/replace the wire harness.

6. Check the switch, then check for a short in the wire between the switch and the control unit that monitors the switch.

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  If the switch and the wire harness are OK, replace the control unit that monitors the switch.

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  If the switch and the wire harness are not OK, replace the switch or repair/replace the appropriate wire harness.