Troubleshooting - B-CAN System Diagnosis Test Mode D

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Perform 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 .
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 (see SYSTEM DESCRIPTION ).
Always turn the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures .

Check the fuse of the malfunctioning output device.
Is the fuse OK?

YES - Go to step 2.

NO - Replace the fuse and recheck.
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 .

NO - Go to step 3.
Turn ON the switch that controls the malfunctioning component.
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.
Check the relay and ground, 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.
Perform the function test for the malfunctioning component.
Does the output device pass the function test?

YES - Go to step 7.

NO - Replace the component.
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.
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 0V to 12 V)?

YES - Replace the component.

NO - Replace the control unit that controls the malfunctioning component.
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 indicate ON when the switch is ON?

YES - Replace the control unit that controls the malfunctioning component.

NO - Go to step 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 the wire harness.