Honda Accord: B-CAN System Diagnosis Test Mode
D - Multiplex Integrated Control
System - Body Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: B-CAN System Diagnosis Test Mode D

Do 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 (see page 22-136).

• 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 page 22-128).

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 MODE MENU from the HDS.

Are any DTCs indicated ? YES

-Go to B-CAN System Diagnosis Test Mode A (see page 22-134).

NO-

Go to step 3.

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

4. Select DATA LIST from the 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 test 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 and body ground wire that the control unit uses to control the output device circuit.

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

Is there a change in voltage (12 VtoOVorO Vto 12 V)? YES

-lnspect 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 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. 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/replace the wire harness.

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