Troubleshooting - B-CAN System Diagnosis Test Mode D

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

Do this diagnosis if a component that is controlled by the B-CAN system does not run 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 control the output devices Multiplex Integrated Control System Description.

1. Check the fuse of the malfunctioning output device.

Is the fuse OK?

YES -

Go to step 2.

NO -

Replace the fuse. If the fuse blows again, repair the short to ground on the fuse circuit of the malfunctioning device.�

2. Check for DTCs by selecting the system 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 the applicable system from the system MODE MENU, then select DATA LIST, and check the input of the switch that controls the related component.

Is there an output signal?

YES -

Go to step 5.

NO -

Go to step 9.

5. Check the relay (if applicable) and ground, then check for an open or a short in the circuit for the malfunctioning component.

Are the relay and the 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 and body ground on the wire that the control unit uses to control the output device circuit.

8. Select FUNCTIONAL. TEST from the system 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 system MODE MENU, and make sure the switch signal input for the malfunctioning system indicates a change when operated.

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

YES -

Replace the control unit that controls the malfunctioning component.�

NO -

Go to step 10.

10. Check 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/replace the wire harness.�