Troubleshooting - B-CAN System Diagnosis Test Mode C
Do this diagnosis if a component that is controlled by the B-CAN system does not stop or turn off.
- 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 (see HDS INPUTS AND COMMANDS ).
- Check the fuse of the malfunctioning output device.
Is the fuse OK?
YES -Go to next step.
NO -Replace the fuse. If the fuse blows again, repair a short to ground on the fuse circuit of the malfunctioning device.
- Check for DTCs by selecting the MODE MENU from the HDS.
Are any DTCs indicated?
YES -Go to B-CAN SYSTEM DIAGNOSIS TEST MODE A
NO -Go to next step.
- Turn ON the switch that controls the malfunctioning component.
- Select the applicable system from the system from the system MODE MENU, then select DATA LIST, and check the output of the signal for the malfunctioning component.
Is there an output signal?
YES -Go to next step.
NO -Replace the control unit that controls the device that will not turn OFF.
- Check the relay and ground that controls the device that does not work, if applicable. If the relay and ground test OK, then check for an open or a short in the circuit for the malfunctioning component.
Are the relay and the wire harness OK?
YES -Replace the control unit that conrols the component that will not stop or turn OFF.
NO -Replace the relay, or repair/replace the wire harness.
- Test the switch, then check for a short in the wire between the switch and the control unit that monitors the switch.
are the switch and wire harness OK?
YES -Replace the control unit that monitors the switch.
NO -Replace the switch, or repair/replace the wire harness.