Troubleshooting - B-CAN System Diagnosis Test Mode D

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

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 (see 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 (see HDS INPUTS, OUTPUTS, AND COMMANDS )

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 (see TROUBLESHOOTING - 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

Is the relay and the circuit OK?

YES -Go to step 6

NO -Replace the relay or repair the wire circuit

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

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 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

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

Is 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