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
- 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 controls the output devices (see HDS INPUTS, OUTPUTS, AND COMMANDS )
- Always cycle the ignition switch within 3 seconds when prompted in the DTC troubleshooting procedures in this service information
- 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 indicated 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 the wire harness