Handsfreelink System Acura MDX II

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1. Make sure the ignition switch is in LOCK (0).
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Turn the ignition switch to ON (II).
4. Make sure the HDS communicates with the vehicle and the HandsFreeLink control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
5. Select HandsFreeLink in the BODY ELECTRICAL menu.
6. Select DTCs in the HandsFreeLink menu.
7. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated «DTC troubleshooting»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#handsfreelink-system) . If no DTCs are indicated, refer to «SYMPTOM TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#handsfreelink-system) . NOTE: After troubleshooting, clear the DTCs with the HDS. For specific operations, refer to the user's manual that came with the HDS.

INTRODUCTION

The HFL system works only with approved Bluetooth®-enabled cell phones with a hands-free profile. If you are not sure if your cell phone is compatible with the HFL system, Acura has a dedicated call center at (888) 528-7876 and web site www.acura.com/handsfreelink, to answer your questions.

The HFL system allows you to make and receive hands-free calls. It cannot control the phone's performance (call quality and signal strength). For more information about performance and performance problems, refer to Dropped Calls.

Checking Cell Phone Compatibility

The most important step in troubleshooting HFL issues is to identify the client's phone model, the software version, and the carrier that experiences the HFL problem. Not all phones with the Bluetooth feature and a hands-free profile are compatible with the HFL system.

Here is the best method to confirm if the phone is compatible

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1. Log onto www.acura.com/handsfreelink.
2. Select Find a Phone.
3. Choose the vehicle model you are working on, then select CONTINUE.
4. Choose the vehicle model year, then select CONTINUE
5. Choose the vehicle trim level, then select CONTINUE.
6. Choose to search by wireless carrier or cell phone manufacturer, then select CONTINUE.
7. A list of all current model phones that have been tested with Acura HFL system appears. If the phone you are using is not in this list, look under the Currently Testing list and the Archived Phones list. NOTE: If the clients' phone isn't on the web site, consider it to be incompatible.
8. Click on the phone model the client is using to view the HandsFreeLink supported features. NOTE: These approved, archived, and currently testing phone model lists are constantly changing, so make sure you view them frequently. Phones are added as they are approved. Phones can be removed from the approved list if a software bug is discovered that makes the phone incompatible. There phones can be added back to the approved list if the phone manufacturer corrects the bug. If the software bug is corrected, a new software version is created and may be listed in the Supported Features section of the phone. The Acura web site now includes the software versions that are tested and approved. When software versions are listed, you need to know which version is loaded on the phone to help you troubleshoot the client's complaint. If you cannot access the Acura web site, call the HFL call center at (888) 528-7876 for further assistance. The call center is open Monday thru Friday from 6:00 a.m. to 6:00 p.m. CST; Saturday from 7:00 a.m. to 6:00 p.m. CST; and Sunday from 8:00 a.m. to 6:00 p.m. CST.

Voice Control Tips

To give any voice commands to the HFL system, press and release the HFL Talk button. Always wait for the beep, then give your command in a clear, natural voice. The HFL microphone is on the ceiling, by the map lights.

If the HFL system doesn't recognize your voice command, you'll hear "Pardon." If your command isn't recognized a second time, you'll hear "Please repeat." If your command isn't recognized a third time, the HFL system sends you to its Help menu.

To hear a list of available options at any time, press the HFL TALK button and say "Hands free help."

The HFL system may have problems with some voices. To improve voice recognition

1. Close the windows and moonroof.
2. Set the fan speed to low (1 or 2).
3. Adjust the air flow from the air conditioning vents so that they do not blow against the microphone on the ceiling.
4. Speak in a clear and natural voice. If the system cannot recognize your command, try speaking louder, in a deeper tone.
5. If the background noise is too loud, you may need to speak louder.
6. If you speak with something in your mouth, or your voice is too high, the system may not interpret your command correctly.
7. Find out if the problem is with one person or with everyone who uses the system. If the system has a problem with only one person's voice, this is a system limitation.

Many issues result from the client not using the system properly. Make sure the client is using the HFL buttons and not the navigation buttons. When the HFL TALK button is pressed, the client hears one audible tone. When the HFL BACK button is pressed, the client hears two audible tones. Make sure to press the HFL BACK button to exit out of the HFL main menu after completing a call and before giving any navigation commands.

The HFL system may experience a number recognition issue, such as when a client rattles off a set of numbers in a group unrecognized by the system. The HFL system understands phone numbers in specific blocks of 1, 3, 4, 7, and 10 numbers. For example, the system understands

1. 1234567890
2. 123-456-7890
3. 1-2-3-4-5-6-7-8-9-0

The system may become confused if numbers are stated in other blocks like these

1. 1234-567-890
2. 12-34-56-78-90
3. 12345-67890
4. 123-4567-890

Navigation Through Menus

To skip a voice prompt, press and release the HFL TALK button while the HFL system is speaking. The system beings listening for your next voice command.

To go back a step in a voice command sequence, press and release the HFL BLACK button, or press the HFL TALK button and say "Go back." If you don't say anything while the HFL system is listening for your voice command, it times out and stops voice recognition. The next time you press and release the HFL TALK button, the HFL system begins listening from the point it timed out.

If you've finished or want to stop a voice command sequence at any time, press and release the HFL BACK button, or press and release the HFL TALK button, wait for the beep, and say "Cancel." The next time you press and release the HFL TALK button, the HFL system begins from its main menu, and MAIN appears on the multi-information display (MID) in the instrument panel. To avoid keeping the audio system muted, press and release the HFL BACK button when you are finished.

Pairing a Cell Phone

You must pair an approved Bluetooth-compatible phone to the HFL system before you can make and receive calls. For a current list of approved phones and specific phone pairing instructions for each phone, see Checking Cell Phone Compatibility, go to www.acura.com/handsfreelink, or call (888) 528-7876.

The following procedure works for most phones. If you cannot pair your phone to the HFL system with this procedure, refer to your phone's operating manual, visit www.acura.com/handsfreelink, or call (888) 528-7876.

Note. You cannot pair a phone if the vehicle is moving. Your phone must be in its Discovery mode. A maximum of six Bluetooth-compatible phones can be paired to the system.

1. With your phone on and the ignition switch in ACCESSORY (I) or ON (II), press and release the HFL TALK button. After the deep, say "Phone setup." The HFL responds, "Phone setup options are status, pair, edit, delete, and list."
2. Press and release the HFL TALK button. After the beep, say "Pair." The HFL responds, "The pairing process requires operation of your mobile phone. For safety, only perform this function while the vehicle is stopped. State a four-digit code for pairing. Note this code. It will be requested by the phone."
3. Press and release the HFL TALK button. After the beep, say the four-digit code you want to use. For example, say "1, 2, 3, 4." The HFL responds, "1, 2, 3, 4. Is this correct?"
4. Press and release the TALK button. After the beep, say "Yes." The HFL responds, "HFL is now searching for a Bluetooth phone. Make sure the phone you are trying to pair is in Discovery mode." If these steps do not works on the phone you are pairing, refer to the phone's operating manual.
5. Follow the prompts on your phone to get it into its Discovery mode. The phone will search for the HFL. When it comes up, select HandsFreeLink from the list of options displayed on your phone.
6. When asked by the phone, enter the four-digit code from step 3 into your phone. The HFL responds, "A new phone has been found. What would you like to name this phone?" .
7. Press and release the HFL TALK button. After the beep, say the name you want to use. For example, say "Tom's phone." The HFL responds, "Tom's phone has been successfully paired. Returning to the main menu."

Pairing Troubleshooting

Many pairing issues are resolved by altering the client's phone settings

Bluetooth feature settings must be turned on. Phone manufacturers set the default to disable Bluetooth features to conserve battery life. Cell phones may provide procedures to "Temporary Power On Bluetooth", or "Power On Bluetooth." Turn the Bluetooth feature on, pair the phone to the vehicle, and confirm the phone is linked. Do this by turning the phone off and back on. Make or receive a call to confirm the cell phone is successfully paired.

When the phone's Bluetooth feature is on, other handsfree accessories such as earpieces or headsets may automatically reconnect to the phone when you turn on the accessory or move it within range of the cell phone.

This results in the phone not connecting to the HFL system when the client enters the vehicle. You must unlink the hands-free accessory from the phone before the HFL system can reconnect.

Some phones have an Auto Answer setting that functions with a headset. This setting must be turned off or the HFL system cannot accept any incoming calls. When this setting is on, it blocks the HFL system from answering the call, and the call goes to voice mail. This can cause the client to think that the cell phone is not paired properly.

If the HFL system has six phones paired, it will not tell you that it has reached its maximum, and will not allow you to pair a new phone. To check how many phones are paired, press and release the HFL TALK button. After the beep, say "Phone setup list." The HFL system lists every assigned phone name paired with it, then finishes by saying "The entire list has been read. Returning to the main menu." Count number of phones listed. If there are six, you must delete one phone before adding a new one.

1. Is the cell phone compatible with the HFL?
2. Is the Bluetooth feature turned on?
3. Is the client using the HFL buttons, not the navigation buttons, when pairing?
4. Is the cell phone battery fully charged, and is there good signal strength when pairing?
5. Do a soft reset on the cell phone.
6. If the client is trying to pair a Blackberry® or Palm TreoTM device, make sure the client uses the shift key when entering the pass code. If the shift key is not pressed, the client may be entering letters. The HFL does not recognize letters. For more information about pairing, refer to the cell phone owner's manual, or go to www.acura.com/handsfreelink.

Dropped Calls

Clients may perceive dropped calls as being an HFL system fault, but most dropped calls are resultant from cell phone and cell phone carrier issues. The HFL system does not directly handle the cell phone signal. It allows the cell phones to transmit the cell phone audio over the vehicle's audio system.

1. Disable Audio Answer. If Auto Answer is enabled, incoming calls are routed to voice mail.
2. Disable Always Ask/Trust, Authorize Device, or similar setting, If these settings are enabled, each time the HFL system attempts to link to the phone, the phone will ask if you want to connect. If you do not allow the connection, the HFL will not operate. The phone must be set to Never Ask, Authorize Device, etc. (based on the phone manufacturer and carrier) for permission. Refer to the cell phone owner's manual for more information.
3. Disable Flip Open to a Answer. If this setting is enabled, the phone must remain open in the vehicle. If it is closed, the incoming calls are routed to voice mail.

Always confirm with the client if the number of dropped calls is higher while using the HFL system as opposed to using the cell phone only. Clients often confuse problems with their phone or carrier as a problem with the HFL system. The HFL system cannot control or determine

1. Cellular connection quality
2. Signal strength
3. Cellular coverage
4. Ambient weather conditions that affect cellular signals

When a client complains about dropped calls, ask questions about when or where the calls are dropped, such as

1. Do you drive the same route on a regular basis?
2. Does the call drop in the same location?
3. Where do you keep your cell phone?
4. Have you compared the number of dropped calls using the HFL versus making calls from the handset?
5. Does your phone have an antenna that needs to be extended? Many reasons for a dropped call are not related to the HFL system. Here are some causes for dropped calls: If the quantity of dropped calls is about the same when the client uses the HFL system versus the handset, the issue is likely due to the cellular phone or carrier. If the phone is equipped with a retractable antenna, it needs to be extended to maximize signal strength. If a client also notices that the calls tend to drop in the same areas, the HFL system may be operating normally, but something about the area diminishes cellular coverage to a point where the call drops. Hills or mountains can block or interfere with cellular signals. High-rise buildings, bridges, or other large structures may block or interfere with cellular signals. Placing the cell phone in a purse, in a metal briefcase, under the seat, in the glove box, or in the trunk can all affect signal reception. There are coverage gaps in the cellular service. When driving, a call is typically passed from one tower to another. If the client drives through an area where there is a coverage gap between towers, the call drops. Electrical storms, heavy rain, or overcast conditions interfere with signal strength. The cell phone battery's state of change can affect signal reception. A low battery may reduce the phone's ability to boost the antenna's power and function properly, especially in low signal strength areas. Some phone manufacturers trade off signal transmission and reception strength for battery life. As the battery weakens, the signal strength may also weaken. Some cell phones may operate more effectively than others in low signal strength areas, especially with a partially charged battery, and depending on whether or not the retractable antenna is fully extended (if applicable). On these models, make sure the antenna is always extended to maximize signal strength and extend battery life.

Phone Will Not Automatically Connect the HFL

If a client complains that their cell phone is not automatically connecting to the HFL system when they enter the vehicle, do this

1. Make sure the Bluetooth feature is turned on in the cell phone
2. Make sure the cell phone is properly painted to the HFL system.
3. Do a soft reset to the cell phone.
4. Check the battery and signal strength on the cell phone. Pairing a phone requires optimal signal strength and a nearly full battery.

Incoming Calls

If a client complains that they cannot receive incoming calls through the HFL system, see if the call is routing to the cell phone instead of the HFL system. An easy way to know if the call is routed to the cell phone is when the client says, "I can't hear the caller, but they can hear me."

1. Make sure the Bluetooth feature is turned on in the cell phone.
2. Make sure the cell phone is paired to the HFL system and linked
3. Make sure the answer settings in the cell phone are set to multi-key or any-key answer. If the phone is set to flip-open to answer, recommend changing the setting to Any Key or leaving the phone flipped open when using the HFL system.
4. Make sure the Audio Answer feature is turned off in the cell phone.
5. Do a soft reset to the phone.
6. Make sure the battery is fully charged and there is adequate signal strength.
7. Ask the client if they have set specific ring tones or ringer IDs to specific contacts. If they have, recommend returning them to a standard ring tone for all calls.
8. Make sure the client is pressing the HFL TALK button and not the HFL BACK button or the navigation buttons.

Outgoing Calls

If a client says that they cannot place a call using the HFL system, ask if the call was initiated through the HFL system or the cell phone itself.

1. Make sure the Bluetooth feature is turned on in the cell phone.
2. Make sure the cell phone is paired to the HFL system and linked.
3. Make sure the client is pressing the HFL TALK button before each command and going through the calling process correctly.
4. Make sure the client is pressing the HFT TALK button and not the HFL BACK button or the navigation buttons.
5. Check if the cell phone has an Authorized Connections or Trusted option.
6. Do a soft reset to the cell phone. If the call is placed by the cell phone: The call will remain on the handset until you transfer it over to the HFL system. To continue the call on the HFL system, you must use the Transfer command by pressing and releasing the HFL TALK button during an active call and saying "Transfer." The client can now continue the call using the HFL system.

Auto Answer

This cell phone setting forces incoming calls to automatically be answered by the handset. Disable this feature on the phone when using the HFL system, as it may interfere with the HFL system answering incoming calls. Set the phone setting to Send Only, Any Key, or Multi-Key answer option.

Answer Options

These cell phone settings allow you to select how you would like to answer an incoming call on the handset. The answer option in the phone can affect inbound calls on the HFL system.

Authorized Connection

This cell phone setting allows the phone to connect automatically with the HFL system without prompting the client for permission to connect. In some instances, it can affect the ability of the phone to properly route sound to the HFL system.

Bluetooth Power

This cell phone function enables or disables the Bluetooth application. When using a hands free device such as HFL, the Bluetooth application needs to be enabled.

Discovery Mode

You need to have the cell phone in Discovery Mode to allow other devices with Bluetooth capabilities (such as the HFL system) to find the phone during the painting process.

Downloaded Ringtones

A client gets these ringtones from an outside source, such as the internet or a mobile phone store.

HFL BACK button

Use this button on the steering wheel to end a call or return to a previous prompt in the HFL menu. Pressing the button twice or holding it down returns you to the HFL main menu.

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HFL TALK button

Use this button on the steering wheel to give commands. Press the button before a voice command is given.

Hard Reset

Hard resets clear the saved settings in the cell phone and restores it to the factory defaults. A hard reset should be done only as a last resort.

Linking

This is when your paired phone is actively ready to use the HFL system. You can pair up to six phones to the HFL system, but only one phone can be linked at a time. If two paired phones are in the vehicle, only the phone that is linked can use the HFL system and functions. The second phone must be used as a normal handset.

Pairing

A description for linking two Bluetooth devices together. In this case, you are linking a cell phone with the HFL system. After the pairing process is complete, the devices are able to recognize each other and communicate wirelessly via Bluetooth.

Soft Reset

This helps to restore the basic functions of the phone. To do a soft reset, turn the phone power off, remove and reinsert the cell phone battery, then turn the phone back on.

Software Version

This refers to the software version loaded in the cell phone. The software version that was tested and determined to be compatible with the HFL system may be listed on the HFL web site. Not all software versions are compatible with the HFL system.

Standard Ringtone

These ringtones come factory-installed on the cell phone.

Clearing the system

Note. This operation clears the HFL system of all passcode(s), any paired phones, and all names in the HFL phonebook. Clearing the HFL system is recommend before selling the vehicle.

1. Press and release the TALK button. After the beep, say "Clear" and the HFL will respond, "This process will clear all paired phones, clear all entries in the phonebook, and clear the passcode. Is this what you would like to do?".
2. Press and release the TALK button. After the beep, say "Yes" and the HFL will respond, "Preparing to clear all paired phones, all phonebook entries, and the passcode. This may take up to 2 minutes to complete".

Self-diagnostic Function

Note. This procedure should be used only if HDS is unavailable.

To run the self-diagnostic function, do the following

1. Turn the ignition switch to ON (II).
2. Press and hold the HFL Back button for more than 5 seconds.
3. When the HandsFreeLink system enters the self-diagnostic function, the following will occur. If the system has not completed testing for DTCs, the HandsFreeLink system says The hands free system test is in progress. If there is no DTC, the HandsFreeLink system says The hands free system is OK. If there is any DTC, the HandsFreeLink system says The hands free system needs to be serviced.

Note. The self-diagnostic function can only be initiated while the HFL is in its idle state. The self-diagnostic function is considered to start once the 5 seconds press and hold is detected, and ends when the units returns to idle state.

Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING INDEX

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HFL System Troubleshooting

Note. You must be able to duplicate the client's concern to successfully diagnose the problem. Always use the client's phone. Make sure the phone is approved and configured correctly. Online, go to www.acura.com, or call the HFL support desk at 888-528-7876 for further assistance.

1. Connect the HDS to the DLC.
2. Turn the ignition switch to ON (II).
3. Check for DTCs. Are any DTCs indicated? YES - Repair the indicated DTCs and recheck. NO - Go to Step 4.
4. Try to duplicate the problem. Can you duplicate the problem? YES - Go to Step 5. NO - The system is OK at this time.
5. Pair the phone to a known-good vehicle (same model, year, and trim), and try duplicate the problem. Does the phone have the same problem on the known-good vehicle ? YES - Call the HFL support desk at 888-528-7876 to make sure the phone is configured correctly and has the correct software. If the phone is configured correctly, it is either a characteristic of the HFL system, or a characteristic of the particular approved phone being used. Explain to your client that this is a system characteristic. Another phone from the approved phone list may give more favorable results. NO - Substitute a known-good HandsFreeLink control unit and recheck. If the problem goes away, replace the original HandsFreeLink control unit.

DTC B1775: Microphone Input/Output Short to Power/Open

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Check for DTCs with the HDS. Is DTC B1775 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.
4. Turn the ignition switch to LOCK (0).
5. Remove the roof console (see «HEADLINER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__headliner-removalinstallation) ) and the console rear trim (see «CENTER CONSOLE REAR TRIM REMOVAL/ INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#consoles__center-console-rear-trim-removal-installation) ).
6. Disconnect the 20P connector from the roof console and the 28P connector from the HandsFreeLink control unit.
7. Turn the ignition switch to ON (II).
8. Measure the voltage between HandsFreeLink control unit the 28P connector No. 13 terminal and body ground. Is there battery voltage? YES - Replace the faulty harness between the HandsFreeLink control unit and the roof console. NO - Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Check for continuity between HandsFreeLink control unit 28P connector No. 13 terminal and roof console 20P connector No. 8 terminal. Is there continuity? YES - Substitute a known-good HandsFreeLink control unit, then recheck. If the symptom goes away, replace the original HandsFreeLink control unit. NO - Replace the faulty harness between the HandsFreeLink control unit and the roof console.

DTC B1776: Microphone Input/Output Short to Ground/Open

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back to ON (II).
3. Check for DTCs with the HDS. Is DTC B1776 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.
4. Turn the ignition switch to LOCK (0).
5. Remove the roof console (see «HEADLINER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__headliner-removalinstallation) ) and the glove box (see «GLOVE BOX REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard__glove-box-removalinstallation) ).
6. Disconnect the 20P connector from the roof console and the 28P connector from the HandsFreeLink control unit.
7. Check for continuity between body ground and the No. 13 and No. 14 terminals of the HandsFreeLink control unit 28P connector individually, then between No. 12 and No. 13 terminals. Is there continuity? YES - Replace the faulty harness between the HandsFreeLinks control unit and the roof console. NO - Go to step 8.
8. Check for continuity between the terminals shown of the HandsFreeLink control unit 28P connector and the roof console 20P connector. Is there continuity? YES - Go to step 9. NO - Replace the faulty harness between the HandsFreeLink control unit and the roof console.
9. Check if the vehicle is equipped with a navigation system. Is the vehicle navigation equipped? YES - Go to step 10. NO - Substitute a known-good HFL control unit and recheck.
10. Disconnect the 14P connector from the navigation unit.
11. Check for continuity between body ground and the No. 27 and No. 28 terminals of the HandsFreeLink control unit 28P connector individually, then between No. 26 and No. 27 terminals. Is there continuity? YES - Replace the faulty harness between the HandsFreeLink control unit and the navigation unit. NO - Go to step 12.
12. Check for continuity between the terminals shown of the HandsFreeLink control unit 28P connector and the navigation unit connector B (14P). Is there continuity? YES - Substitute a known-good HandsFreeLink control unit, then recheck. If the symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the faulty navigation unit. NO - Replace the faulty harness between the HandsFreeLink control unit and the navigation unit.

DTC B1779: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Open/Short

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), then start the vehicle and turn the steering wheel back and forth several times.
3. Check for DTCs with the HDS. Is DTC B1779 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.
4. Turn the ignition switch to LOCK (0).
5. Do the HFL switch test (see «HFL SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#handsfreelink-system) ). Is the switch OK? YES - Go to step 6. NO - Replace the cable reel subharness (see «STEERING WHEEL DISASSEMBLY/REASSEMBLY»(/acura/mdx/ii-2006-2010/remont/manual-power-steering/#power-steering-system) ).
6. Remove the glove box (see «GLOVE BOX REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard__glove-box-removalinstallation) ).
7. Disconnect the 28P connector from the HandsFreeLink control unit.
8. Disconnect the 20P connector from the cable reel subharness.
9. Turn the ignition switch to ON (II).
10. Check for voltage on the cable reel subharness 20P connector terminal No. 8. Is there voltage? YES - Repair a short to power on BLU wire. NO - Go to step 11.
11. Check for continuity between the HandsFreeLink control unit 28P connector No. 2 terminal and cable reel subharness 20P connector No. 8 terminal. Is there continuity? YES - Go to step 12. NO - Repair open in the BLU wire between the switch, cable reel, and HandsFreeLink control unit.
12. Check for continuity between the cable reel subharness 20P connector No. 9 terminal and the audio unit connector B (32P) No. 3 terminal. Is there continuity? YES - Check for loose or poor connections at the audio unit, HandsFreeLink control unit, and HFL switch. If the connections are OK, substitute a known-good HandsFreeLink control unit. If the problem is gone, replace the original control unit. NO - Repair open in the wire between the switch, cable reel, and the audio unit.

DTC B1780: HFL Switch (HFL TALK/HFL BACK Buttons) Circuit Short

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

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1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), then start the vehicle and turn the steering wheel back and forth several times.
3. Check for DTCs with the HDS. Is DTC B1780 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.
4. Turn the ignition switch to LOCK (0).
5. Do the HFL switch test (see «HFL SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#handsfreelink-system) ). Is the switch OK? YES - Go to step 6. NO - Replace the cable reel subharness (see «STEERING WHEEL DISASSEMBLY/REASSEMBLY»(/acura/mdx/ii-2006-2010/remont/manual-power-steering/#power-steering-system) ).
6. Turn the ignition switch to LOCK (0).
7. Remove the glove box (see «GLOVE BOX REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard__glove-box-removalinstallation) ).
8. Disconnect the 28P connector from the HandsFreeLink control unit.
9. Disconnect the 20P connector from the cable reel subharness.
10. Check for continuity between the HandsFreeLink control unit 28P connector No. 2 terminal and body ground. Is there continuity? YES - Repair short in the wire. NO - Replace the HandsFreeLink control unit.

DTC B1785: Incorrect Configuration (VEHINFO Frame)

1. Connect the HDS to the DLC.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) and wait 6 seconds or more.
4. Check for DTC with the HDS. Is DTC B1785 indicated? YES - Gauge control module is faulty, replace the gauge control module. NO - Intermittent failure. VEHINFO frame is OK at this time. Check for poor connections or loose terminals at the HandsFreeLink control unit.

DTC B1786: HandsFreeLink Control Unit Lost Communication with Gauge Control Module (VEHINFO Frame)

Note. If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Scheme 21

Scheme 22

Scheme 23

Scheme 24

1. Connect the HDS to the DLC.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it to ON (II) and wait 6 seconds or more.
4. Check for DTC with the HDS. Is DTC B1786 indicated? YES - Go to step 5. NO - Intermittent failure. VEHINFO frame is OK at this time. Check for poor connections or loose terminals at the HandsFreeLink control unit.
5. Check for DTC with the HDS. Is DTC B1011, B1032, B1060, B1061, B1205, B1206, B1207, B1906, B1956, B2157, B2160 indicated? YES - Go to step 6. NO - HandsFreeLink control unit is faulty, replace the HandsFreeLink control unit.
6. Select the UNIT INFORMATION MENU from the HDS, and do the CONNECTED UNIT.
7. Check the AVAILABLE/NOT AVAILABLE information of the gauge control module in the CONNECTED UNIT. Is the information indicator NOT AVAILABLE? YES - Go to step 8. NO - Gauge control module is faulty, replace the gauge control module.
8. Turn the ignition switch to LOCK (0).
9. Disconnect the gauge control module connector A (12P).
10. Turn the ignition switch to ON (II).
11. Measure the voltage between body ground and gauge control module connector A (12P) No. 7 terminal. Is there battery voltage? YES - Go to step 12. NO - Check the No. 21 (7.5 A) fuse in the under-dash fuse/relay box. If the fuse are good, repair open in the wire between the No. 21 fuse in the under-dash fuse/relay box and the gauge control module.
12. Turn the ignition switch to LOCK (0).
13. Disconnect the gauge control module connector B (24P).
14. Check for continuity between body ground and gauge control module connector A (12P) No. 2 terminal and gauge control module connector B (24P) No. 13 terminal individually. Is there continuity? YES - Go to step 15. NO - Repair open in the wire(s) between body ground and the gauge control module.
15. Disconnect the power tailgate control unit connector C (14P).
16. Check for continuity between the power tailgate control unit connector C (14P) No. 7 terminal and gauge control module connector A (12P) No. 5 terminal. Is there continuity? YES - Gauge control module is faulty, replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). NO - Repair open in the wire between power tailgate control unit and the gauge control module.

DTC B1792: HandsFreeLink Control Unit Internal Error

1. Connect the HDS to the DLC.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch to LOCK (0), and then back to ON (II).
4. Check for DTCs with the HDS. Is DTC B1792 indicated? YES - Replace the HandsFreeLink control unit (see «CONTROL UNIT INPUT TEST/REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#handsfreelink-system) ). NO - Intermittent failure, the system is OK at this time.

The MID displays an HFL message that does not go away after pressing the HFL BACK button

1. Connect the HDS to the DLC.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch to LOCK (0), and then to ON (II).
4. Check for DTCs. Are there any DTCs indicate? YES - Repair the indicated DTCs. NO - Go to step 5.
5. Turn the ignition switch to LOCK (0).
6. Substitute a known-good HandsFreeLink control unit, then turn the ignition switch to ON (II) and recheck the MID. Are the messages cleared? YES - Replace the original HandsFreeLink control unit. NO - Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).

The HFL system does not recognize all voice prompts

1. Connect the HDS to the DLC.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch to LOCK (0), and then to ON (II).
4. Check for DTCs. Are there any DTCs indicated? YES - Repair the indicated DTCs. NO - Go to step 5.
5. Check if the problem is duplicated. Can the client's problem be duplicated? YES - Go to step 6. NO - The system is OK at this time. Ask the client to demonstrate the problem.
6. Check if the navigation system can recognize for voice prompts. Can the voice prompts be recognized? YES - Go to step 7. NO - Refer to the navigation system troubleshooting.
7. Pair the client's phone to a known-good vehicle and try to duplicate the problem. Can you duplicate the problem? YES - Call the HFL support desk at 888-528-7876, and inquire if there are any known issues for the problem. If there are no known issues, explain to the client this is a system characteristic and cannot be improved at this time. NO - Substitute a known-good HFL/navigation microphone. If the problems still present, substitute a known-good HandsFreeLink control unit. If the problem goes away, replace the original HFL/ navigation microphone.

The HFL system is locked and the pass code has been lost or forgotten

1. Connect the HDS to the DLC.
2. Turn the ignition switch to ON (II).
3. From the Body Electrical menu, then select HandsFreeLink.
4. Select Miscellaneous Tests, then select Pass code reset.
5. Follow the HDS system prompts to reset the pass code.

Scheme 25

1. Remove the driver's airbag (see «DRIVER'S AIRBAG REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ).
2. Disconnect the 20P connector (A).
3. Measure the resistance between the No. 8 and No. 9 terminals in each switch position according to the table. HFL Switch HFL SWITCH POSITION Position Resistance No buttons pressed About 1 k ohms HFL TALK button pressed About 185 ohms HFL BACK button pressed About 45 ohms
4. If the resistance is not as specified, replace the switch (see «STEERING WHEEL DISASSEMBLY/REASSEMBLY»(/acura/mdx/ii-2006-2010/remont/manual-power-steering/#power-steering-system) ).

Scheme 26

1. Remove the console rear trim (see «CENTER CONSOLE REAR TRIM REMOVAL/ INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#consoles__center-console-rear-trim-removal-installation) ).
2. Disconnect the 28P connector (A) from the HandsFreeLink control unit (B).
3. Inspect the connector and socket terminals for a good pinfit to be sure they are all making good contact. If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 4.
4. Reconnect the connector, and make these input tests at the connector. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 5. TEST CONDITION Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V. Poor ground (G506) An open in the wire 15 WHT Under all conditions Measure the voltage to ground: There should be battery voltage. Blown No. 5 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire 16 PUR Ignition switch ACC (I) or ON (ID Measure the voltage to ground: There should be battery voltage. Blown No. 32 (10 A) fuse in the driver's under-dash fuse/relay box An open in the wire
5. Disconnect the 28P connector again, and make this input test at the connector. If the test indicates a problem, find and correct the cause, then recheck the system. If the input test proves OK, the HandsFreeLink control unit must be faulty, replace it. TEST CONDITION Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 19 LT GRN Under all conditions Check for continuity between No. 19 terminal and the driver's under-dash fuse/relay box connector X (39P) No. 27 terminal: There should be continuity. An open in the wire Driver's under-dash fuse/relay box connector X (39P) disconnected Check for continuity to ground: There should be no continuity. Short to ground

HFL/Navigation Microphone Removal/Installation

Note. Put on gloves to protect your hands. Take care not to scratch the dashboard and related parts. Lay a workshop towel under the parts when working on them to protect the face panel from scratches or other damage.

Scheme 27

Scheme 28

1. Remove the roof console (see «HEADLINER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__headliner-removalinstallation) ).
2. Remove the screws and the printed circuit board (A).
3. Disconnect the connectors (B) from the printed circuit board.
4. Remove the screws and the microphone (A). ©
5. Install the microphone in the reverse order of removal.

See also:
• DLC CIRCUIT TROUBLESHOOTING
• TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A
• HEADLINER REMOVAL/INSTALLATION
• CENTER CONSOLE REAR TRIM REMOVAL/ INSTALLATION
• GLOVE BOX REMOVAL/INSTALLATION
• STEERING WHEEL DISASSEMBLY/REASSEMBLY
• GAUGE CONTROL MODULE REPLACEMENT
• DRIVER'S AIRBAG REPLACEMENT
• DTC troubleshooting
• THE MID DISPLAYS AN HFL MESSAGE THAT DOES NOT GO AWAY AFTER PRESSING THE HFL BACK BUTTON
• CLEARING THE HFL SYSTEM
• THE HFL SYSTEM IS LOCKED AND THE PASS CODE HAS BEEN LOST OR FORGOTTEN
• THE HFL SYSTEM DOES NOT RECOGNIZE ALL VOICE PROMPTS
• VOICE CONTROL TIPS