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Home >> Acura >> 2009 >> MDX V6-3.7L >> Repair and Diagnosis >> Accessories and Optional Equipment >> Navigation System >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Navigation Cannot Control HVAC By Voice Command (With Navigation) >> Symptom Troubleshooting
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Symptom Troubleshooting




Symptom Troubleshooting: Navigation cannot control HVAC by voice command

Navigation cannot control HVAC by voice command

NOTE:

- Check for and resolve all CAN DTCs before troubleshooting the navigation system.

- Always check the connectors for poor connections or loose terminals.

- Before troubleshooting, make sure you have anti-theft codes for the navigation system.

- After troubleshooting, enter the anti-theft codes for the navigation system.

- Verify that the correct navigation unit is installed for this model. Go into the Diagnostic mode, and use Version. Navigation System Diagnostic Mode (With Navigation)

- Make sure that the correct DVD color and version are installed.

- Check on-line for service bulletins or other service information for the navigation system.

1. Connect the HDS to the DLC. Check for B-CAN or F-CAN DTCs in the data list.

Are there any DTCs in the B-CAN or F-CAN systems?
YES - Troubleshoot and repair all CAN related DTCs, and then retest.

NO - Go to step 2.


2. Check the navigation system for normal operation.

Does the navigation system function normally in all other operations?
YES - Go to step 3.

NO - Refer to the navigation symptom troubleshooting. Troubleshoot and repair any other problems, then retest.


3. Disconnect climate control unit connector A (40P) and navigation unit connector A (20P).

4. Check for continuity between climate control unit connector A (40P) and navigation unit connector A (20P) according to the table.





Is there continuity on all wires?
YES - Go to step 5.

NO - Repair open in the affected wire(s) between climate control unit connector A (40P) and navigation unit connector A (20P).






5. Check for continuity between each wire in the navigation unit connector A (20P) according to the table.





Is there continuity to any other wire?
YES - Repair short in the affected wire(s) between climate control unit connector A (40P) and navigation unit connector A (20P).

NO - Go to step 6.






6. Check for continuity between navigation unit connector A (20P) and body ground according to the table.





Is there continuity to ground?
YES - Repair short to ground in the affected wire(s).

NO - Go to step 7.






7. Turn the ignition switch to ON (II).

8. Measure the voltage between navigation unit connector A (20P) terminals No. 4, No. 14, and No. 15 and body ground.





Is there more than 0.2 V to ground on any wire?
YES - Repair short to power on the affected wire(s).

NO - Go to step 9.






9. Substitute and a known-good climate control unit. Reconnect all connectors and retest.

Does the symptom go away?
YES - Replace the original climate control unit.

NO - Replace the navigation unit. Service and Repair


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