Onstar System Acura MDX I

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Scheme 127

1. OnStar system is activated.
2. Data is transmitted to service provider.
3. A call center associate makes an appropriate response: - Accident/Emergency notification (Police, Fire and EMS, etc.) - Airbags deployment (Accident) - Roadside assistance - Stolen vehicle tracking - Remote door lock/unlock command - Misplaced vehicle (Flashes parking lights/honks horn) - Route guidance - Ride Assist - Concierge service/convenience

OnStar Panel Buttons And Lights

OnStar Service Button - Press this blue button, and you will be connected to an OnStar Advisor. You will hear a chime, following by the words "Connecting to OnStar." OnStar then generates a sequence of tones (beeps) during the connection process. The process will normally take about 15 seconds. The system is equipped with backup connection retry capabilities. If you do not immediately connect to OnStar, DO NOT DISCONNECT. A series of retry attempts will be made automatically. If you wish to cancel your call to the OnStar Call Center, simply press the call answer/call end button. The blue OnStar services button is also used to control the "Advisor Playback" feature during a call with OnStar.

OnStar Emergency Button - In an emergency, press this button to connect with on OnStar Advisor. The call will be given the highest priority, and you will hear a chime followed by the words "Connecting to OnStar Emergency." The Advisor will attempt to locate your vehicle, find out what kind of assistance you require, and contact a nearby emergency service provider (If needed). Use this button only for true emergencies. If you press this button by mistake, please stay on the line and tell the advisor that there is no emergency.

Note. Pressing the red emergency button will provide the OnStar Call Center with your location, while dialing 911 or other numbers will not.

Call Answer/Call End Button

1. Make a call with OnStar Personal Calling, a hands-free, voice activated phone that's integrated into the vehicle. (If activated)
2. When the radio mutes and you hear ringing, press this button to answer on incoming phone call.
3. To end any call including an OnStar call or a personal call.

Voice Activated Keypad Button

The voice - Activated Keypad button of OnStar personal calling (If activated) allows access to most voicemail systems. It also allows you to respond to number requests from computer system, such as "press 1 for sales; press 2 for service."

System Status Indicator Light

Solid Green - Indicates the OnStar system in the vehicle is powered ON and ready to make or receive calls.

Blinking Green - The light blinks green to indicate a call is being connected or in progress. If you notice this light blinking while you are not on a call, press the CALL ANSWER/CALL END button.

Solid Red or Blinking Red - This signals that the OnStar system is not functioning properly. Press the OnStar button to attempt to contact an OnStar Advisor. If the connection is made, the Advisor will assist you in making sure your OnStar system is operating properly. If you cannot contact the OnStar Call Center, check for DTCs.

Alternately Blinks Red and Green - The system does not respond to any button being pushed. This indicates the OnStar control unit is in the Shipping Mode and will need to be transitioned to the Market Mode (see TRANSITIONING THE ONSTAR CONTROL UNIT TO MARKET MODE ).

Stolen Vehicle Tracking

If the vehicle is stolen, the owner can report it to the call center. They will notify the authorities and track the vehicle location to assist in recovery.

Virtual Advisor

1. Virtual advisor setup; A subscriber sets up a personal profile on their home computer through the internet at the OnStar web site. - Stock portfolio - Traffic - Sports - News - Weather - E-mail
2. The subscriber calls the OnStar call center.
3. OnStar receives and processes the request.
4. The profile accessed for requested information.
5. OnStar sends information back to the subscriber. A computer voice relays the requested information.

Cellular Phone

The user can make a hands-free cellular phone call with one touch (by pressing the "call answer/call end" button), and by using voice recognition commands.

Remote Operation

The vehicle doors can be locked remotely if forgotten, or unlocked when keys are accidentally left inside the vehicle. If the vehicle is misplaced in a parking lot, vehicle alert (honks the horn and Flashes the parking lights) can be requested remotely.

OnStar Power Modes

During normal vehicle operation, the system is in high power mode. After the ignition switch is turned OFF, the system will go into low power mode for 48 hours, after that the system will switch to sleep mode to conserve battery power. When in low power mode, the system will switch back to the high power mode for 1 minute out of every 10 minutes for a period of 48 hours. Remote operation is only available during the 1 minute period of high power operation. When the system is in sleep mode, remote operation is not possible.

Registering A Replacement OnStar Unit

Note. If the OnStar control unit is replaced with a new unit, you must transition the replacement unit from "Shipping Mode" to "Market Mode" (see TRANSITIONING THE ONSTAR CONTROL UNIT TO MARKET MODE ), and then register the new unit with OnStar.

Begin the registration process by recording the replacement units STID and ESN serial numbers located on the unit label. Next, with the ignition switch turned ON (II), press the OnStar services button to connect to the OnStar call center. When the OnStar agent answers, provide the replacement unit's STID and ESN serial numbers. The agent will provide you with further instructions.

Note. If you cannot connect to the OnStar call center from the vehicle because of cellular network connections problems (the OnStar status light is blinking green), you must contact OnStar Technical Support at 800-ONSTAR-7 (800-677-2877) by regular phone.

Cellular network issues are indicated by, but not limited to, error messages like, "Your cellular number is not recognized" or "Please enter your credit card number now", etc.

Messages like these indicate the replacement unit's MIN or ESN is not being resolved by OnStar Technical Support.

If you cannot connect to the OnStar call center from the vehicle and the OnStar status light is solid or blinking red, see ONSTAR PANEL BUTTONS AND LIGHTS .

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EMERGENCY CALL OPERATION CHART

ONSTAR CALL OPERATION CHART

VOICE RECOGNITION OPERATION CHART

VOICE RECOGNITION FOR CELLULAR PHONE CHART

Self-Diagnostic Function

The OnStar system has a self-diagnostic function.

The self-diagnostic function is performed when the ignition switch is turned ACC (I) or ON (II).

Note. Most items are checked with ACC (I) except the Collision Detection Signal.

Scheme 129

The OnStar control unit will store the DTCs when failures have been found in the self-diagnostic function mode. The red LED will be turned ON at the same time.

Four Button Diagnosis

The OnStar control unit will perform a four button diagnosis. When an open or short to ground failure has been found at the button input line, the OnStar control unit will store the DTC and turn the red LED ON.

Microphone Diagnosis

The OnStar control unit will perform a microphone diagnosis. When an open or short to ground failure has been found at the microphone input line, the OnStar control unit will store the DTC and turn the red LED ON.

Collision Detection Signal Diagnosis

The OnStar control unit will perform a collision detection signal diagnosis. When a failure has been found on collision detection signal circuit, the OnStar control unit will store the DTC and turn the red LED ON.

Phone Antenna Diagnosis

The OnStar control unit will perform a phone antenna diagnosis. When an open or short to ground failure has been found at the phone antenna input line, the OnStar control unit will store the DTC and turn the red LED ON.

GPS Antenna Diagnosis

The OnStar control unit will perform a GPS antenna diagnosis. When an open or short to ground has been found on the GPS antenna input line, the OnStar control unit will store the DTC and turn the red LED ON.

Scheme 130

1. Start with the ignition switch in the OFF (0) position
2. Press and hold down the CALL ANSWER/CALL END button.
3. Cycle the ignition switch from the OFF (0) position to the ACC (I) position 4 times within 6 seconds, and stop in the ACC (I) position on the fourth cycle.
4. Release the CALL ANSWER/CALL END button to enter the diagnosis mode.

How to Display The DTC

When the OnStar control unit enters the diagnosis mode, and has current DTCs, the OnStar control unit will flash the OnStar LED indicator RED to display current DTCs. If the OnStar control unit has only history DTCs, the OnStar control unit will flash the OnStar LED indicator GREEN to display history DTCs.

Scheme 131

Note. If the OnStar LED is solid RED and you cannot pull DTC's because the buttons are non-responsive, do the DTC 2-5 troubleshooting first.

DTC INDEX

How to Delete the DTC

Note. After a repair has been made, turn the ignition switch to ON (II) for 30 seconds then to OFF. This allows the OnStar control unit to check the system for a normal condition and allow the codes to clear.

When the OnStar button is pressed (less than 2 seconds) after the final DTC is displayed, the OnStar control unit will delete all DTCs, then will exit from the self-diagnostic mode.

Scheme 132

How To Exit The Self-Diagnostic Function

Turn the ignition switch OFF during the DTC display mode.

Output Mode

When the ignition switch is turned OFF within 3 seconds after the final DTC is displayed, the OnStar control unit will enter the Output Mode and operate the door lock/unlock, horns, parking lights and taillights.

Scheme 133

When all operations have completed, the OnStar control unit will exit from the Self-diagnostic Mode and go to Market Mode *.

* Market mode: When the vehicle arrives at the dealership, the OnStar control unit will be in Market Mode. However, if a dealer has to replace the OnStar control unit, the service part will be in Shipping Mode. The dealer will need to go through the button press sequence to get the unit to transition from Shipping Mode to Market Mode. The dealer will also need to contact OnStar to verify the configuration of the new unit for the customer (see CONTROL UNIT REPLACEMENT ).

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Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING INDEX

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1. Check if the system responds when you press any of the OnStar buttons. Is there a response? YES - Go to step 2. NO - Go to step 3
2. Enter the self-diagnostic mode and check for DTCs. Can you retrieve any DTCs? YES - See Diagnostic Troubleshooting (see «HOW TO ENTER THE DIAGNOSIS MODE (FROM NORMAL OPERATION MODE)»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system) ). NO - Go to step 3.
3. Check fuses No. 6 (10 A) and No. 9 (15 A). Are the fuses OK? YES - Go to step 4. NO - Replace the fuses and recheck.
4. Turn the ignition switch ON (II)
5. Check for battery voltage between the OnStar control unit connector A (22P) No. 1 and No. 13 terminals and to the No. 12 terminal individually. Is there battery voltage on both? YES - Go to step 7 NO - If you have no voltage on both, go to step 6. If there is battery voltage only on one of them, repair the open in the appropriate wire.
6. Check for battery voltage between the OnStar control unit connector A (22P) No. 1 and No. 13 terminals and body ground. Is there battery voltage on both? YES - Repair the open on the OnStar control unit ground between A12 and G502. NO - Check for a loose connection at C688.
7. Check the OnStar indicator LED. Is the OnStar indicator LED solid red? YES - Go to step 8. NO - If the LED is blinking red, and you could not retrieve any DTCs from step 2 and the voltages are correct for step 5 , then replace the OnStar control unit.
8. Disconnect the OnStar control unit connector B (16P). Does the LED go out? YES - Replace the OnStar control unit. NO - Go to step 9.
9. Disconnect the roof console connector (20P).
10. Check the roof console 20P connector No. 16 terminal for continuity to ground. Is there continuity? YES - Repair the short to ground on the terminal No. 16 wire. NO - Replace the roof console assembly.

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Scheme 139

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1. Check if the system responds when you press any of the OnStar buttons. Is there a response? YES - Go to step 2. NO - Go to step 3
2. Enter the self-diagnostic mode and check for DTCs. Can you retrieve any DTCs? YES - See Diagnostic Troubleshooting (see «HOW TO ENTER THE DIAGNOSIS MODE (FROM NORMAL OPERATION MODE)»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system) ). NO - Go to step 3.
3. Check fuses No. 6 (10 A) and No. 9 (15 A). Are the fuses OK? YES - Go to step 4. NO - Replace the fuses and recheck.
4. Turn the ignition switch ON (II).
5. Check for battery voltage between the OnStar control unit connector A (22P) No. 1 and No. 13 terminals and to the No. 12 terminal individually. Is there battery voltage on both? YES - Go to step 7 NO - If you have no voltage on both, go to step 6. If there is battery voltage only on one of them, repair the open in the appropriate wire.
6. Check for battery voltage between the OnStar control unit connector A (22P) No. 1 and No. 13 terminals and body ground. Is there battery voltage on both A1 and A13 to body ground? YES - Repair the open on the OnStar control unit ground between A12 and G502. NO - Check for a loose connection at C688.
7. Disconnect the roof console connector (20P).
8. Perform the OnStar button test (see «DTC 2-5: ONSTAR SWITCHES (FOUR BUTTONS) CIRCUIT MALFUNCTION»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system) ). Did the buttons test as specified? YES - Go to step 9. NO - Replace the roof console.
9. Disconnect the OnStar control unit connector B (16P).
10. Check for continuity between the roof console 20P connector No. 13 terminal and OnStar control unit connector B (16P) No. 6 terminal and roof console No. 14 terminal and OnStar control unit connector B (16P) No. 14 terminal. Is there continuity as specified on the wire(s) (Scheme 139)above? YES - Go to step 11. NO - Repair open in appropriate wire(s).
11. Check for continuity between the roof console 20P connector No. 13 and No. 14 terminals to body ground Is there continuity at either terminal? YES - Repair short to body ground in the appropriate wire(s). NO - Go to step 12.
12. Reconnect the roof console connector (20P).
13. Check the OnStar Indicator. Is the OnStar Indicator either solid red or solid green? YES - Go to step 14. NO - Replace the OnStar control unit.
14. Disconnect the roof console and check No. 16 and No. 15 terminals for continuity to body ground Is there continuity at either terminal? YES - Repair short to ground in the appropriate wire(s). NO - Replace the OnStar control unit.

1. Check the OnStar indicator. Does the OnStar indicator LED blink green when placing the call? YES - Go to step 2. NO - If the OnStar indicator LED is red (solid or blinking), see the symptom troubleshooting chart.
2. Contact OnStar technical support and verify the ESN and MIN are properly registered. Are the ESN and MIN properly registered with OnStar? YES - Replace the OnStar control unit. NO - Have OnStar technical support remedy the problem and retest.

DTC CODES

DTC CHART

DTC 1-1: OnStar Control Unit Internal Error (DSP Communicate Error, CPU Or DSP Memory Error)

Note. Check battery charge and condition

1. Delete all DTCs from the OnStar control unit (see «HOW TO DELETE THE DTC»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system__how-to-delete-the-dtc) ).
2. Turn the ignition switch OFF, and then back to ACC (I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 1-1 indicated? YES - Replace the OnStar control unit. NO - Intermittent failure. The system is OK at this time. Check for loose or poor connections

DTC 1-2: OnStar Control Unit Internal Error (EEPROM error)

Note. Check battery charge and condition

1. Delete all DTCs from the OnStar control unit (see «HOW TO DELETE THE DTC»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system__how-to-delete-the-dtc) ).
2. Turn the ignition switch OFF, and then back to ACC (I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 1-2 indicated? YES - Replace the OnStar control unit. NO - Intermittent failure. The system is OK at this time. Check for loose or poor connections.

DTC 1-3: GPS Receiver Error

Note. Check battery charge and condition

1. Delete all DTCs from the OnStar control unit (see «HOW TO DELETE THE DTC»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system__how-to-delete-the-dtc) ).
2. Turn the ignition switch OFF, and then back to ACC (I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 1-3 indicated? YES - Replace the OnStar control unit. NO - Intermittent failure. The system is OK at this time. Check for loose or poor connections.

DTC 1-4: Telephone Module Error

Note. Check battery charge and condition.

1. Delete all DTCs from the OnStar control unit (see «HOW TO DELETE THE DTC»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system__how-to-delete-the-dtc) ).
2. Turn the ignition switch OFF, and then back to ACC (I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 1-4 indicated? YES - Replace the OnStar control unit. NO - Intermittent failure. The system is OK at this time. Check for loose or poor connections.

DTC 2-1: OnStar Control Unit Lost Communication With SRS Unit (Collision Detection Signal Error)

Note. Check battery charge and condition, and check connector for loose or poor connection and pinfits.

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Scheme 144

1. Delete all DTCs from the OnStar control unit (see «HOW TO DELETE THE DTC»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system__how-to-delete-the-dtc) ).
2. Turn the ignition switch OFF, and then back to ON (II).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 2-1 indicated? YES - Go to step 4. NO - Intermittent failure. The system is OK at this time. Check for loose or poor connections.
4. Check the SRS indicator. Does the SRS indicator come on and stay on? YES - Go to SRS troubleshooting (see «PRECAUTIONS AND PROCEDURES»(/acura/mdx/i-2000-2006/remont/airbag/#srs-supplemental-restraint-system) ). NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the OnStar control unit connector A (22P).
7. Disconnect the SRS unit connector A (28P).
8. Check for continuity between the OnStar control unit connector A (22P) No. 14 terminal and body ground. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 9.
9. Turn the ignition switch ON (II).
10. Measure voltage between the OnStar control unit connector A (22P) No. 14 terminal and body ground. Is there more than 0.1 V? YES - Repair a short to power in the wire. NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Check for continuity between the OnStar control unit connector A (22P) No. 14 terminal and SRS unit connector A (28P) No. 21 terminal. Is there continuity? YES - Replace the SRS unit. If the problem does not go away, replace the OnStar unit. NO - Repair an open in the wire.

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1. Delete all DTCs from the OnStar control unit (see «HOW TO DELETE THE DTC»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system__how-to-delete-the-dtc) ).
2. Turn the ignition switch OFF, and then back to ACC(I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 2-3 indicated? YES - Go to step 4. NO - Intermittent failure. The system is OK at this time. Check for sharp bends or kinks in the GPS/Cellular antenna lead that may cause an intermittent failure. Check for loose or poor connections.
4. Turn the ignition switch OFF.
5. Disconnect the OnStar control unit antenna connector (2P).
6. Remove the headliner (see «HEADLINER REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/exteriorinterior-trim/#interior-trim__headliner-removalinstallation) ), and disconnect the GPS/Cellular phone antenna 2P connector.
7. Check for continuity between the OnStar control unit antenna connector (2P) No. 1 terminal and GPS/Cellular phone antenna 2P connector No. 1 terminal. NOTE: Carefully probe so not to spread the female pins. Is there continuity? YES - Go to step 8. NO - Replace the shielded GPS/Cellular antenna lead.
8. Check for continuity between the OnStar control unit antenna connector (2P) No. 1 terminal and body ground. Is there continuity? YES - Replace the shielded GPS/Cellular antenna lead. NO - Go to step 9.
9. Check for continuity between the core and outer part of the antenna lead at the OnStar control unit antenna connector (2P) No. 1 terminal. Is there continuity? YES - Replace the shielded GPS/Cellular antenna lead. NO - Go to step 10.
10. Reconnect the OnStar control unit antenna connector (2P).
11. Turn the ignition switch ON (II).
12. Measure voltage between the core and outer part of the antenna lead at the GPS/Cellular phone antenna 2P connector No. 1 terminal. Is there about 5 V? YES - Substitute a known-good GPS/Cellular antenna and recheck. If the DTC 2-3 is still present, replace the OnStar control unit. NO - Replace the OnStar control unit.

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1. Delete all DTCs from the OnStar control unit.
2. Turn the ignition switch OFF, and then back to ACC (I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 2-4 indicated? YES - Go to step 4. NO - Intermittent failure. The system is OK at this time. Check for sharp bends or kinks in the GPS/ Cellular antenna lead that may cause an intermittent failure. Check for loose or poor connections.
4. Turn the ignition switch OFF.
5. Disconnect the OnStar control unit antenna connector (2P).
6. Remove the headliner (see «HEADLINER REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/exteriorinterior-trim/#interior-trim__headliner-removalinstallation) ), and disconnect the GPS/Cellular phone antenna 2P connector.
7. Check for continuity between the OnStar control unit antenna connector (2P) No. 2 terminal and GPS/Cellular phone antenna 2P connector No. 2 terminal. NOTE: Carefully probe so not to spread the female pins. Is there continuity? YES - Go to step 8. NO - Replace the shielded GPS/Cellular antenna lead.
8. Check for continuity between the OnStar control unit antenna connector (2P) No. 2 terminal and body ground. Is there continuity? YES - Replace the shielded GPS/Cellular antenna lead. NO - Go to step 9.
9. Check for continuity between the core and outer part of the antenna lead at the OnStar control unit antenna connector (2P) No. 2 terminal. Is there continuity? YES - Replace the shielded GPS/Cellular antenna lead. NO - Go to step 10.
10. Reconnect the OnStar control unit connector (2P).
11. Turn the ignition switch ON (II).
12. Measure voltage between the core and outer part of the antenna lead at the GPS/Cellular phone antenna 2P connector No. 2 terminal. Is there about 5 V? YES - Substitute a known-good shielded GPS/Cellular antenna and recheck. If the DTC 2-4 is still present, replace the OnStar control unit. NO - Replace the OnStar control unit.

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Scheme 156

1. Delete all DTCs from the OnStar control unit.
2. Turn the ignition switch OFF, and then back to ACC (I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 2-5 indicated? YES - Go to step 4. NO - Intermittent failure. The system is OK at this time. Check for loose or poor connections.
4. Turn the ignition switch OFF.
5. Disconnect the roof console 20P connector.
6. Check for continuity between the roof console 20P connector No. 13 and No. 2 terminals, and No. 14 and No. 2 terminals. Is there continuity? YES - Replace the roof console. NO - Go to step 7.
7. Perform the OnStar Button Test (see «ONSTAR BUTTON TEST»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system) ). Is the switch OK? YES - Go to step 8. NO - Replace the roof console.
8. Disconnect the OnStar control unit connector B (16P).
9. Check for continuity between the OnStar control unit connector B (16P) No. 6 and No. 14 terminals and roof console 20P connector No. 13 and No. 14 terminals. Is there continuity? YES - Go to step 10. NO - Repair an open in the wire.
10. Check for continuity between the OnStar control unit connector B (16P) No. 6 and No. 14 terminals and body ground. Is there continuity? YES - Repair a short to ground in the wire. NO - Go to step 11.
11. Turn the ignition switch ON (II).
12. Measure voltage between the OnStar control unit connector B (16P) No. 6 and No. 14 terminals and body ground. Is there voltage? YES - Repair a short to power in the wire. NO - Replace the OnStar control unit.

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1. Delete all DTCs from the OnStar control unit.
2. Turn the ignition switch OFF, and then back to ACC (I).
3. Enter the self-diagnostic mode and check for the DTCs. Is DTC 2-6 indicated? YES - Go to step 4. NO - Intermittent failure. The system is OK at this time. Check for loose or poor connections.
4. Turn the ignition switch OFF.
5. Disconnect the roof console 20P connector.
6. Disconnect the OnStar control unit connector B (16P).
7. Check for continuity between the OnStar control unit connector B (16P) No. 1 and No. 9 terminals and roof console 20P connector No. 18 and No. 19 terminals. Is there continuity? YES - Go to step 8. NO - Replace the affected shielded harness.
8. Check for continuity between the OnStar control unit connector B (16P) No. 1 and No. 9 terminals and body ground. Is there continuity? YES - Replace the affected shielded harness. NO - Go to step 9.
9. Check for continuity between the OnStar control unit connector B (16P) No. 1 and No. 9 terminals and No. 10 terminal. Is there continuity? YES - Replace the affected shielded harness. NO - Go to step 10.
10. Turn the ignition switch ON (II).
11. Measure voltage between the OnStar control unit connector B (16P) No. 1 and No. 9 terminals and body ground. Is the voltage above 0 V? YES - Replace the affected shielded harness. NO - Go to step 12.
12. Turn the ignition switch OFF.
13. Reconnect the OnStar control unit connector B (16P).
14. Measure voltage between the OnStar control unit connector B (16P) No. 1 and No. 9 terminals. Is there about 8.5 V? YES - Substitute a known-good roof console and recheck. If the DTC is still present, replace the OnStar control unit. NO - Replace the OnStar control unit.

Scheme 162

1. Remove the center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ).
2. Disconnect the 22P and 16P connectors (A) from the OnStar control unit (B).
3. Inspect the connector and socket terminals 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 connectors to the OnStar control unit, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all input tests prove the terminals look OK, go to step 5. ONSTAR CONTROL UNIT INPUT TEST (CONNECTORS RECONNECTED) Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained A12 BLK Under all conditions Check for voltage to ground: There should be 1 V or less. Poor ground (G502) An open in the wire A1 RED/BLU Under all conditions Check for voltage to ground: There should be battery voltage. Blown No. 6 (10 A) fuse in the passenger's under-dash fuse/ relay box An open in the wire A2 YEL/GRN Ignition switch ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire A13 WHT/RED Ignition switch in ACC (I) and ON (II) Check for voltage to ground: There should be battery voltage. Blown No. 8 (7.5 A) fuse in the driver's under-dash fuse/relay box Blown No. 9 (15 A) fuse in the passenger's under-dash fuse/ relay box Blown No. 54 (40 A) fuse in the under-hood fuse/relay box Faulty accessory power socket relay An open in the wire B10 GRY Under all conditions Check for voltage to ground: There should be 1 V or less. Poor ground (G502) An open in the wire B13 LTGRN/BLK Under all conditions Check for voltage to ground: There should be 1 V or less. Poor ground (G502) An open in the wire B14 BRN Under all conditions Check for voltage to ground: There should be 1 V or less. Poor ground (G502) An open in the wire B1 WHT Ignition switch in ACC (I) and ON (II) Check for voltage to ground: There should be about 4 V. Short in wire (0V)/ open in wire (8 V) Faulty OnStar button/ microphone assembly Faulty OnStar control unit Ignition switch in ACC (I) or ON (II), speak to the microphone at various volumes Check for voltage to B9: There should be about 0.1 to 0.9 V (A.C.) as you speak. Open or short in the wire Faulty OnStar button/ microphone assembly B9 BLU/RED Under all conditions Check for voltage to ground: There should be 1 V or less. Poor ground (G502) An open in the wire Unplug the OnStar button and microphone assembly Check for continuity to ground: There should be continuity. Poor ground (G502) An open in the wire
5. Disconnect the 22P and 16P connectors from the OnStar control unit, and make these input tests at the connectors. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, substitute a known-good control unit, then recheck the system. If problem is gone, replace the control unit. ONSTAR CONTROL UNIT INPUT TEST (22P AND 16P DISCONNECTED) Cavity Wire Test condition Test; Desired result Possible cause if result is not obtained A3 RED/WHT Under all conditions NOTE: Disconnect the HandsFreeLink control unit 22P connector and audio unit connector F (14P) (2) or connector B{16P) (1) Check for continuity between the A3 terminal and HandsFreeLink control unit 22P connector No. 14 terminal: There should be continuity. An open in the wire Check for continuity to A12: There should be no continuity. A short to ground B4 RED/BLU Check for continuity between the B4 terminal and HandsFreeLink control unit 22P connector No. 7 terminal and audio unit connector F(14P) No. 3 terminal (2) or connector B (16P) No. 4 terminal (1) : There should be continuity. An open in the wire Check for continuity to A12: There should be no continuity. A short to ground B12 YEL Check for continuity between the B12 terminal and HandsFreeLink control unit 22P connector No. 19 terminal: There should be continuity. An open in the wire A10 RED/YEL Combination light switch in PARK position Check for voltage to ground: There should be battery voltage. Faulty combination light switch Faulty taillight relay An open in the wire A11 LTGRN/BLU Under all conditions Attach to ground: The horn should sound. Faulty horn Faulty horn relay An open in the wire A14 RED/GRN Under all conditions NOTE: Disconnect the SRS unit connector A (28P). Check for continuity between the A14 terminal and SRS unit 28P connector No. 21 terminal: There should be continuity. An open in the wire Check for continuity to A12: There should be no continuity. A short to ground A21 BLK/BLU Under all conditions NOTE: Disconnect the passenger's under-dash fuse/ relay box connector E (20P). Check for continuity between the A21 terminal and passenger's under-dash fuse/ relay box connector E (20P) No. 3 terminal: There should be continuity. An open in the wire Check for continuity to A12: There should be no continuity. A short to ground A22 ORN Check for continuity between the A21 terminal and passenger's under-dash fuse/ relay box connector E (20P) No. 7 terminal: There should be continuity. An open in the wire Check for continuity to A12: There should be no continuity. A short to ground B6 YEL/GRN Under all conditions Measure resistance between the B6 and B14 terminals: There should be about 4 k ohm. Faulty roof console An open in the wire B14 BRN B16 LTGRN Under all conditions NOTE: Disconnect the audio unit connector E (5P). Check for continuity between the B18 terminal and audio unit connector E (5P) No. 1 terminal: There should be continuity. An open in the wire Check for continuity to A12: There should be no continuity. A short to ground (1) Without Rear Entertainment System (2) With Rear Entertainment System

Scheme 163

1. Remove the roof console (see «FRONT INDIVIDUAL MAP LIGHT TEST»(/acura/mdx/i-2000-2006/remont/interiorillumination-lights/#interior-lights__front-individual-map-light-test) ).
2. Disconnect the 20P connector (A) from the roof console (B).
3. Measure the resistance between the roof console 20P connector No. 13 and No. 14 terminals. There should be about 4 k ohm. If the resistance is not as specified, replace the roof console. If OK, go to step 4.
4. Measure the resistance between roof console 20P connector No. 13 and No. 2 terminals, and No. 14 and No. 2 terminals individually. If there is continuity, replace the roof console. If there is no continuity, go to step 5.
5. Measure resistance between the roof console 20P connector No. 13 and No. 14 terminals with each button pressed according to «ROOF CONSOLE 20P CONNECTOR NO. 13 AND NO. 14»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system) . ROOF CONSOLE 20P CONNECTOR NO. 13 AND NO. 14 Button pressed Resistance ONSTAR EMERGENCY About 201 ohm ONSTAR SERVICE About 402 ohm CALL ANSWER/CALL END About 804 ohm VOICE ACTIVATED KEYPAD About 1554 ohm
6. If the resistance is not as specified, replace the roof console.

Scheme 164

Scheme 165

1. Remove the roof console (see «FRONT INDIVIDUAL MAP LIGHT TEST»(/acura/mdx/i-2000-2006/remont/interiorillumination-lights/#interior-lights__front-individual-map-light-test) ).
2. Disconnect the 20P connector (A) from the roof console (B).
3. Check for continuity of the LED between the roof console 20P connector No. 15 (+) and No. 14 (-) terminals, and No. 16 (+) and No. 14 (-) terminals according to (Scheme 165).
4. If there is no continuity, replace the roof console.

Scheme 166

1. Remove the center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/mdx/i-2000-2006/remont/gauges-instrument-panels/#consoles__center-console-removalinstallation) ).
2. Remove the rear blower motor (see «REAR BLOWER MOTOR REPLACEMENT»(/acura/mdx/i-2000-2006/remont/manual-hvac-system/#rear-air-conditioning) )
3. Loosen the bolts that secure the OnStar control unit and bracket (E) to the shift lever base assembly, then slide the control unit and bracket forward to remove it.
4. Disconnect the 22P and 16P connector (A), the antenna lead 2P connector (B), and the antenna lead 1P connector (C) from the OnStar control unit (D).
5. Remove the bracket from the control unit.
6. Install the control unit in the reverse order of removal. NOTE: Replacement units are in the Shipping Mode and will need to be switched to Market Mode (see «TRANSITIONING THE ONSTAR CONTROL UNIT TO MARKET MODE»(/acura/mdx/i-2000-2006/remont/entertainment-systems/#onstar-system__transitioning-the-onstar-control-unit-to) ).

Transitioning the OnStar Control Unit to Market Mode

1. Turn the ignition switch ON (II).
2. Press and release the OnStar emergency button.
3. Press and release the OnStar services button.
4. Press and release the call answer/call end button.
5. Press and release the voice activated keypad button.
6. The system should respond by saying "Pardon". You can let the system timeout to the ready mode (it will say "Goodbye"), or press the call answer/ call end button to return the system to the ready mode.

Control Unit Replacement

The dealer troubleshooting process for OnStar consists of these items

1. Check fuses for OnStar system.
2. Check continuity of wiring.
3. OnStar diagnostic check.
4. Vehicle interface functionality check.

If the OnStar hardware in a vehicle has been replaced, the dealer must contact OnStar technical support to register the new OnStar control unit's STID and ESN (see REGISTERING A REPLACEMENT ONSTAR UNIT ).

The dealer will do the MIN programming and confirmation process if a new MIN is provided by OnStar technical support.

Once the dealer has notified OnStar of the new ESN and MIN, and done the MIN programming process if necessary, the dealer will press the blue OnStar services button and request a configuration for the vehicle.

DES44: 3.4 MIN programming process

DES45

Scheme 167

Scheme 168

See also:
• PRECAUTIONS AND PROCEDURES
• HEADLINER REMOVAL/INSTALLATION
• CENTER CONSOLE REMOVAL/INSTALLATION
• FRONT INDIVIDUAL MAP LIGHT TEST
• REAR BLOWER MOTOR REPLACEMENT
• TRANSITIONING THE ONSTAR CONTROL UNIT TO MARKET MODE
• ONSTAR PANEL BUTTONS AND LIGHTS
• DTC 1-1: ONSTAR CONTROL UNIT INTERNAL ERROR (DSP COMMUNICATE ERROR, CPU OR DSP MEMORY ERROR)
• DTC 1-2: ONSTAR CONTROL UNIT INTERNAL ERROR (EEPROM ERROR)
• DTC 1-3: GPS RECEIVER ERROR
• DTC 1-4: TELEPHONE MODULE ERROR
• DTC 2-1: ONSTAR CONTROL UNIT LOST COMMUNICATION WITH SRS UNIT (COLLISION DETECTION SIGNAL ERROR)
• DTC 2-3: GPS ANTENNA CIRCUIT MALFUNCTION
• CONTROL UNIT REPLACEMENT
• HOW TO DELETE THE DTC
• REGISTERING A REPLACEMENT ONSTAR UNIT