Troubleshooting - B-CAN System Diagnosis Test Mode D

Multiplex Integrated Control System Troubleshooting - B-CAN System Diagnosis Test Mode D

Perform this diagnosis if a component that is controlled by the B-CAN system does not work or come on.

NOTE:

- If the component does not turn off or stop, go to B-CAN System Diagnosis Test Mode C Troubleshooting - B-CAN System Diagnosis Test Mode C.
- 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 controls the output devices Description and Operation.

1. Check the fuse of the malfunctioning output device.

Is the fuse OK?

YES -

Go to step 2.

NO -

Replace the fuse and recheck.�

2. Check for DTCs by selecting the TEST MODE menu from the HDS.

Are any DTCs indicated ?

YES -

Go to B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.�

NO -

Go to step 3.

3. Turn ON the switch that controls the malfunctioning component.

4. Select DATA LIST from the TEST MODE menu, and check output signal for the malfunctioning component.

Is there an output signal?

YES -

Go to step 5.

NO -

Go to step 9.

5. Test the relay and ground that controls the device that does not work, if applicable. If the relay and ground tests OK, then check for an open or a short in the circuit for the malfunctioning component.

Are the relay and circuit OK?

YES -

Go to step 6.

NO -

Replace the relay or repair the wire circuit.�

6. Do the function test for the malfunctioning component.

Does the output device pass the function test?

YES -

Go to step 7.

NO -

Replace the component.�

7. With the malfunctioning output device connected, connect a voltmeter between the malfunctioning output device input and the body ground on the wire that the control unit uses to control the output device circuit.

8. Select MISC. TEST from the TEST MODE menu, and do the forced operation test of the malfunctioning component.

Is there a change in voltage (12 V to 0 V or 0 V to 12 V)?

YES -

Inspect the ground for the component. If OK, replace the component.�

NO -

Replace the control unit that controls the malfunctioning component.�

9. Select DATA LIST from the TEST MODE menu, and make sure the switch signal input for the malfunctioning system indicates a change when operated.

Does the switch input indicated ON when the switch is ON?

YES -

Replace the control unit that controls the malfunctioning component.�

NO -

Go to step 10.

10. Test the switch and its ground (if applicable), then check for an open or a short in the wire between the switch and the control unit that monitors it.

Are the switch and the wire harness OK?

YES -

Replace the control unit that monitors the switch.�

NO -

Replace the switch or repair the wire harness.�