Active Damper System Acura MDX II

Scheme 1

System Indicator

This system has an active damper system indicator (A).

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When the active damper system is working correctly, the active damper system indicator comes on after turning the ignition switch ON (II), and it goes off when the engine is started.

The system detects a problem, the indicator comes on, then the indicator will stay on until the ignition switch is turned to LOCK (0), or until the problem goes away (system returns to normal), the indicator will then go off.

Note. The damper system mode is controlled by the active damper system switch and is indicated on the MID (multi-information display) (B).

Diagnostic Trouble Code (DTC)

1. The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the most recent DTC is written over the earlier one. Therefore, when the same problem is detected repeatedly, it is memorized as a single DTC.
2. The DTCs are indicated in ascending numerical order, not in the order they occur.
3. The DTCs are memorized in the EEPROM. Therefore, the memorized DTCs cannot be cancelled by disconnecting the battery. Do the specified procedures to clear the DTCs.

Self-diagnosis

1. Self-diagnosis can be classified into two categories: Initial diagnosis: Done right after the ignition switch is turned to ON (II) and until the active damper system indicator goes off. Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to LOCK (0).
2. When the system detects a problem, it will go into fail safe mode which turns off the active damper function. When in this mode,, handling characteristics are limited, and the vehicle speed should be reduced to 60 mph (96 km/h) or less, and driven no more than 200 miles (321 km).

Mode Select Switch

The system has two damping modes. Comfort and sport mode. Modes are changed using the mode selector switch.

The active damper system has four individual damper units, one on each suspension corner. These dampers function the same as conventional dampers, but they should only be replaced as a single unit when indicated by a DTC. Do not replace the dampers units as a set.

How to Troubleshoot DTCs

DTC troubleshooting procedures assume that the cause of the problem is still present and the active damper system indicator is still on. Following a troubleshooting procedure for a code that has been cleared and does not reset can result in incorrect diagnosis.

1. Question the client about the conditions that were present when the problem occurred, such as speed, turning, road conditions, and which mode the active damper system was selected. Try to duplicated the DTC by test-driving the vehicle under the same conditions.
2. Check for DTCs in the PGM-FI, A/T, and VSA system related to F-CAN stored at the same time. Troubleshoot these codes first, before troubleshooting the active damper system.
3. After troubleshooting, or repairs are done, clear the DTCs, and test-drive the vehicle under the same conditions that originally set the DTCs. Make sure the active damper system indicator does not come on.

Intermittent Failures

The term "Intermittent failure" means a system may have had a failure, but it checks OK now. If the active damper system indicator does not come on, check for poor connections or loose terminals at all connectors related to the circuit that you are troubleshooting. If the indicator was on but then went out, the original problem may have been intermittent.

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1. If the active damper system indicator stays on, turn the ignition switch to LOCK (0), and connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the active damper system 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) ).
4. Check for and note any stored DTCs. Also check the on-board snapshot data, and download any data found. Then refer to the indicated DTCs troubleshooting, and begin the appropriate troubleshooting procedure. NOTE: The HDS can read the DTC, freeze data, snapshot, current data, and other system data. For specific operations, refer to the Help menu on the HDS.

How to Clear DTCs

1. With the ignition switch at LOCK (0), connect the HDS to the data link connector (DLC) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the active damper system 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) ).
4. Clear the DTC(s) by following the screen prompts on the HDS.
5. Turn the ignition switch to LOCK (0).

Memorizing Rear Suspension Full Rebound Position

Do the rear suspension full rebound position memorizing whenever you do any of these actions

1. Replace the active damper control unit.
2. Replace the rear damper unit.
3. Remove and install the rear suspension stroke sensor.
4. In the specific DTC troubleshooting.

Scheme 4

1. With the ignition switch at LOCK (0), connect the HDS to the data link connector (DLC) (A) under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the active damper 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) ).
4. Check for DTCs and make sure no DTC is indicated. NOTE: For specific operations, refer to the Help menu that came with the HDS.
5. Turn the ignition switch to LOCK (0).
6. Raise the rear of the vehicle, and support it with safety stands in the proper locations (see «LIFT AND SUPPORT POINTS»(/acura/mdx/ii-2006-2010/remont/paintcoatings/#general-information__lift-and-support-points) ). NOTE: Verify the rear tires are suspended off the ground.
7. Make sure the rear suspension stroke sensors are installed correctly, and the linkages are properly connected (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).
8. Turn the ignition switch to ON (II).
9. Follow the screen prompts on the HDS to memorize the rear suspension full rebound position. NOTE: For specific operations, refer to the Help menu that came with the HDS.
10. Turn the ignition switch to LOCK (0).

DTC Troubleshooting Index

DTC TROUBLESHOOTING CHART

Symptom Troubleshooting Index

When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

SYMPTOM TROUBLESHOOTING CHART

Scheme 5

ACTIVE DAMPER CONTROL UNIT CONNECTOR TERMINAL REFERENCE A (20P)

Scheme 6

ACTIVE DAMPER CONTROL UNIT CONNECTOR TERMINAL REFERENCE B (14P)

The active damper control unit continuously monitors inputs from various sensors and the mode select switch. The control unit will adjust each damper's force by controlling current to them.

The active damper system requires a special damper that is capable of quick response and action. This allows them to respond quickly for changes in conditions.

Scheme 7

System Communication

The active damper system has an active damper control unit, four quick-reacting damper units with internal damper coil, three vertical acceleration sensors, four suspension stroke sensors, an active damper system switch, and an active damper system indicator. In addition, the active damper system receives signals from the VSA system, the PCM, and relates information with the headlight leveling control system.

The active damper control unit performs an arithmetical operation from various vehicle conditions pitching, roll, bump, vehicle speed, and driver's mode selection, then selects the most suitable damping characteristics or setting.

Scheme 8

MRF (Magneto Rheological Fluid) in the Damper Unit

Variable suspension damping force is achieved by controlling the intensity of magnetic flux in the damper piston. The orientation of iron particles suspended in the damper oil is changed as the fluid flows through the magnetic field, thereby changing the effective viscosity of the fluid. The amount of change in the fluid's behavior is proportional to the amount of electrical current supplied to the windings in the piston.

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 1-1, 1-2, or 1-3 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the vertical acceleration sensor and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect active damper control unit connector B (14P).
8. Turn the ignition switch to ON (II).
9. Measure voltage between body ground and the appropriate active damper control unit connector B (14P) terminal (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector B Terminal 1-1 No. 14 1-2 No. 12 1-3 No. 10 Is there more than 0.5 V? YES - Repair short to power in the wire between the appropriate vertical acceleration sensor and the active damper control unit, then go to step 14 . NO - Go to step 10.
10. Turn the ignition switch to LOCK (0).
11. Disconnect the appropriate vertical acceleration sensor 3P connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-1 Front 1-2 Right-rear 1-3 Left-rear
12. Check for continuity between appropriate vertical acceleration sensor terminals No. 1 and No. 3. DTC 1-1 DTC 1-2 DTC 1-3 Is there continuity? YES - Repair short in the wires between the appropriate vertical acceleration sensor and the active damper control unit. NO - Go to step 13.
13. Check for continuity between active damper control unit connector B (14P) terminal No. 11 and appropriate vertical acceleration sensor 3P connector terminal No.2 (see table). CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-1 Front 1-2 Right-rear 1-3 Left-rear Is there continuity? YES - Go to step 15 . NO - Repair open in the wire between the appropriate vertical acceleration sensor and the active damper control unit.
14. Turn the ignition switch to LOCK (0).
15. Reconnect all connectors.
16. Do the appropriate vertical acceleration sensor inspection (see «VERTICAL ACCELERATION SENSOR INSPECTION»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-1 Front 1-2 Right-rear 1-3 Left-rear Does the vertical acceleration sensor indicate OK? YES - Go to step 17. NO - Replace the appropriate vertical acceleration sensor (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ).
17. Clear the DTC with the HDS.
18. Turn the ignition switch to LOCK (0).
19. Start the engine, and wait 5 seconds.
20. Check for DTCs with the HDS. Is DTC 1-1, 1-2, or 1-3 indicated? YES - Substitute a known-good active damper control unit and retest. If the DTC goes away, replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Troubleshooting is complete.

DTC 1-4: Front Vertical Acceleration Sensor Range/Performance Problem; DTC 1-5: Right-rear Vertical Acceleration Sensor Range/Performance Problem; DTC 1-6: Left-rear Vertical Acceleration Sensor Range/Performance Problem

1. Turn the ignition switch to LOCK (0).
2. Do the appropriate vertical acceleration sensor inspection (see «VERTICAL ACCELERATION SENSOR INSPECTION»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-4 Front 1-5 Right-rear 1-6 Left-rear Does the vertical acceleration sensor indicate OK? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Replace the appropriate vertical acceleration sensor (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ).

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 1-7, 1-8, or 1-9 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the vertical acceleration sensor and the active damper control unit.
6. Do the appropriate vertical acceleration sensor inspection (see «VERTICAL ACCELERATION SENSOR INSPECTION»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-7 Front 1-8 Right-rear 1-9 Left-rear Does the vertical acceleration sensor indicate OK? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Disconnect active damper control unit connector B (HP).
9. Disconnect the appropriate vertical acceleration sensor 3P connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-7 Front 1-8 Right-rear 1-9 Left-rear
10. Check for continuity between body ground and the appropriate active damper control unit connector B (14P) terminal (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector B Terminal 1-7 No. 14 1-8 No. 12 1-9 No. 10 Is there continuity? YES - Repair short to body ground in the wire between the appropriate vertical acceleration sensor and the active damper control unit. NO - Go to step 11.
11. Check for continuity between appropriate vertical acceleration sensor terminals No. 2 and No. 3. DTC 1-7 DTC 1-8 DTC 1-9 Is there continuity? YES - Repair short in the wires between the appropriate vertical acceleration sensor and the active damper control unit. NO - Go to step 12.
12. Check for continuity between the appropriate active damper control unit connector B (14P) terminal and appropriate vertical acceleration sensor 3P connector terminal No. 3 (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector B Terminal Appropriate Vertical Acceleration Sensor 1-7 No. 14 Front 1-8 No. 12 Right-rear 1-9 No. 10 Left-rear Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the appropriate vertical acceleration sensor and the active damper control unit.
13. Check for continuity between active damper control unit connector B (14P) terminal No. 4 and appropriate vertical acceleration sensor 3P connector terminal No. 1 (see table). CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-7 Front 1-8 Right-rear 1-9 Left-rear Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the appropriate vertical acceleration sensor and the active damper control unit.
14. Reconnect active damper control unit connector B (14P).
15. Start the engine, and wait 5 seconds.
16. Measure voltage between body ground and appropriate vertical acceleration sensor 3P connector terminal No. 1. CONNECTOR TERMINAL REFERENCE DTC Appropriate Vertical Acceleration Sensor 1-7 Front 1-8 Right-rear 1-9 Left-rear Is there about 5 V? YES - Replace the appropriate vertical acceleration sensor (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ). NO - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 2-1, or 2-3 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the suspension stroke sensor and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect active damper control unit connector A (20P).
8. Turn the ignition switch to ON (II).
9. Measure voltage between body ground and the appropriate active damper control unit connector A (20P) terminal (see table). CONNECTOR TERMINAL REFERENCE DTC Active pamper Control Unit Connector A Terminal 2-1 No. 17 2-3 No. 13 Is there more than 0.5 V? YES - Repair short to power in the wire between the appropriate suspension stroke sensor and the active damper control unit, then go to step 15 . NO - Go to step 10.
10. Turn the ignition switch to LOCK (0).
11. Disconnect active damper control unit connector B (14P).
12. Disconnect the appropriate suspension stroke sensor 3P connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Suspension Stroke Sensor 2-1 Right-front 2-3 Right-rear
13. Check for continuity between appropriate suspension stroke sensor 3P connector terminals No. 1 and No. 2. Is there continuity? YES - Repair short in the wires between the appropriate suspension stroke sensor and the active damper control unit. NO - Go to step 14.
14. Check for continuity between active damper control unit connector B (14P) terminal No. 11 and appropriate suspension stroke sensor 3P connector terminal No. 3 (see table). CONNECTOR TERMINAL REFERENCE DTC Appropriate Suspension Stroke Sensor 2-1 Right-front 2-3 Right-rear Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the appropriate suspension stroke sensor and the active damper control unit.
15. Turn the ignition switch to LOCK (0).
16. Reconnect all connectors.
17. Remove the appropriate suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). Do not disconnect the sensor connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Suspension Stroke Sensor 2-1 Right-front 2-3 Right-rear
18. Start the engine, and wait 5 seconds.
19. Check the SUS STROKE_S VOLTAGE (RF), or (RR) in the ACTIVE DAMPER SYSTEM DATA LIST with the HDS while moving the suspension stroke sensor arm through a complete stroke. Compare the voltage/rotation angle between the chart and the measurements. NOTE: The voltage should increase (decrease) within 90 degrees of the sensor arm rotation from the first voltage change point. Is the voltage as specified? YES - Go to step 20. NO - Replace the appropriate suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).
20. Clear the DTC with the HDS.
21. Turn the ignition switch to LOCK (0).
22. Start the engine, and wait 5 seconds.
23. Check for DTCs with the HDS. Is DTC 2-1, or 2-3 indicated? YES - Substitute a known-good active damper control unit and retest. If the DTC goes away, replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Troubleshooting is complete.

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 2-2 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the suspension stroke sensor and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect active damper control unit connector A (20P).
8. Disconnect the headlight leveling control unit 16P connector.
9. Turn the ignition switch to ON (II).
10. Measure voltage between body ground and active damper control unit connector A (20P) terminal No. 15. Is there more than 0.5 V? YES - Repair short to power in the wire between the left-front suspension stroke sensor, the headlight leveling control unit, and the active damper control unit, then go to step 17 . NO - Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Disconnect active damper control unit connector B (14P).
13. Disconnect the left-front suspension stroke sensor 3P connector.
14. Check for continuity between left-front suspension stroke sensor 3P connector terminals No. 1 and No. 2. Is there continuity? YES - Repair short in the wires between the left-front suspension stroke sensor and the active damper control unit. NO - Go to step 15.
15. Check for continuity between headlight leveling control unit 16P connector terminal No. 12 and left-front suspension stroke sensor 3P connector terminal No. 3. Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the left-front suspension stroke sensor and the headlight leveling control unit.
16. Check for continuity between body ground and headlight leveling control unit 16P connector terminal No. 9. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the headlight leveling control unit and body ground (G401).
17. Turn the ignition switch to LOCK (0).
18. Reconnect all connectors.
19. Remove the left-front suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). Do not disconnect the sensor connector.
20. Start the engine, and wait 5 seconds.
21. Check the SUS STROKE_S VOLTAGE (LF) in the ACTIVE DAMPER SYSTEM DATA LIST with the HDS while moving the suspension stroke sensor arm through a complete stroke. Compare the voltage/rotation angle between the chart and the measurements. NOTE: The voltage should increase (decrease) within 90 degrees of the sensor arm rotation from the first voltage change point. Is the voltage as specified? YES - Go to step 22. NO -Replace the appropriate suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).
22. Clear the DTC with the HDS.
23. Turn the ignition switch to LOCK (0).
24. Start the engine, and wait 5 seconds.
25. Check for DTCs with the HDS. Is DTC 2-2 indicated? YES - Substitute a known-good active damper control unit and retest. If the DTC goes away, replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Troubleshooting is complete.

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 2-4 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the suspension stroke sensor and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect active damper control unit connector B (14P).
8. Disconnect the headlight leveling control unit 16P connector.
9. Turn the ignition switch to ON (II).
10. Measure voltage between body ground and active damper control unit connector B (14P) terminal No. 7. Is there more than 0.5 V? YES - Repair short to power in the wire between the left-rear suspension stroke sensor, the headlight leveling control unit, and the active damper control unit, then go to step 17 . NO - Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Disconnect active damper control unit connector B (14P).
13. Disconnect the left-rear suspension stroke sensor 3P connector.
14. Check for continuity between left-rear suspension stroke sensor 3P connector terminals No. 1 and No. 2. Is there continuity? YES - Repair short in the wires between the left-rear suspension stroke sensor and the active damper control unit. NO - Go to step 15.
15. Check for continuity between headlight leveling control unit 16P connector terminal No. 4 and left-rear suspension stroke sensor 3P connector terminal No. 3. Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the left-rear suspension stroke sensor and the headlight leveling control unit.
16. Check for continuity between the body ground and the headlight leveling control unit 16P connector terminal No. 9. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the headlight leveling control unit and body ground (G401).
17. Turn the ignition switch to LOCK (0).
18. Reconnect all connectors.
19. Remove the left-rear suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). Do not disconnect the sensor connector.
20. Start the engine, and wait 5 seconds.
21. Check the SUS STROKE_S VOLTAGE (LR) in the ACTIVE DAMPER SYSTEM DATA LIST with the HDS while moving the suspension stroke sensor arm through a complete stroke. Compare the voltage/rotation angle between the chart and the measurements. NOTE: The voltage should increase (decrease) within 90 degrees of the sensor arm rotation from the first voltage change point. Is the voltage as specified? YES - Go to step 22. NO - Replace the appropriate suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).
22. Clear the DTC with the HDS.
23. Turn the ignition switch to LOCK (0).
24. Start the engine, and wait 5 seconds.
25. Check for DTCs with the HDS. Is DTC 2-4 indicated? YES - Substitute a known-good active damper control unit and retest. If the DTC goes away, replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Troubleshooting is complete.

Scheme 42

1. Turn the ignition switch to LOCK (0).
2. Remove the appropriate suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). Do not disconnect the sensor connector. NOTE: After troubleshooting for the left side suspension stroke sensor, do the headlight initial position learning procedure (see «HEADLIGHT INITIAL POSITION LEARNING PROCEDURE»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__headlight-initial-position-learning-procedure) ). CONNECTOR TERMINAL REFERENCE DTC Appropriate Suspension Stroke Sensor 2-5 Right-front and Right-rear 2-6 Left-front and Left-rear
3. Start the engine, and wait 5 seconds.
4. Check the SUS STROKE_S VOLTAGE (RF), (LF), (RR), or (LR) in the ACTIVE DAMPER SYSTEM DATA LIST with the HDS while moving the suspension stroke sensor arm through a complete stroke. Compare the voltage/rotation angle between the chart and the measurements. NOTE: The voltage should increase (decrease.) within 90 degrees of the sensor arm rotation from the first voltage change point. Is the voltage as specified? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Replace the appropriate suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).

DTC 2-8: Right-front Suspension Stroke Sensor Signal Circuit Low Voltage; DTC 2-A: Right-rear Suspension Stroke Sensor Signal Circuit Low Voltage

Note. If DTC 8-2 is stored at the same time as DTC 2-8 or DTC 2-A, troubleshoot DTC 8-2 first, then recheck for DTC 2-8 and DTC 2-A.

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1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 2-8, or 2-A indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the suspension stroke sensor and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the appropriate suspension stroke sensor 3P connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Suspension Stroke Sensor 2-8 Right-front 2-A Right-rear
8. Disconnect active damper control unit connector A (20P).
9. Check for continuity between body ground and the appropriate active damper control unit connector A (20P) terminal (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal 2-8 No. 17 2-A No. 13 Is there continuity? YES - Repair short to body ground in the wire between the appropriate suspension stroke sensor and the active damper control unit. NO - Go to step 10.
10. Disconnect active damper control unit connector B (14P).
11. Check for continuity between appropriate suspension stroke sensor 3P connector terminals No. 2 and No. 3. Is there continuity? YES - Repair short in the wires between the appropriate suspension stroke sensor and the active damper control unit. NO - Go to step 12.
12. Check for continuity between the appropriate active damper control unit connector A (20P) terminal and appropriate suspension stroke sensor 3P connector terminal No. 2 (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal Appropriate Suspension Stroke Sensor 2-8 No. 17 Right-front 2-A No. 13 Right-rear Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the appropriate suspension stroke sensor and the active damper control unit.
13. Check for continuity between active damper control unit connector B (14P) terminal No. 4 and appropriate suspension stroke sensor 3P connector terminal No. 1 (see table). CONNECTOR TERMINAL REFERENCE DTC Appropriate Suspension Stroke Sensor 2-8 Right-front 2-A Right-rear Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the appropriate suspension stroke sensor and the active damper control unit.
14. Reconnect active damper control unit connector A (20P) and connector B (14P).
15. Start the engine, and wait 5 seconds.
16. Measure voltage between body ground and appropriate suspension stroke sensor 3P connector terminal No. 1. CONNECTOR TERMINAL REFERENCE DTC Appropriate Suspension Stroke Sensor 2-8 Right-front 2-A Right-rear Is there about 5 V? YES - Replace the suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). NO - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

DTC 2-9: Left-front Suspension Stroke Sensor Signal Circuit Low Voltage

Note. If DTC 8-3 is stored at the same time as DTC 2-9, troubleshoot DTC 8-3 first, then recheck for DTC 2-9.

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 2-9 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the suspension stroke sensor and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the left-front suspension stroke sensor 3P connector.
8. Disconnect active damper control unit connector A (20P).
9. Disconnect the headlight leveling control unit 16P connector.
10. Check for continuity between body ground and active damper control unit connector A (20P) terminal No. 15. Is there continuity? YES - Repair short to body in the wire between the left-front suspension stroke sensor, the headlight leveling control unit, and the active damper control unit. NO - Go to step 11.
11. Check for continuity between left-front suspension stroke sensor 3P connector terminals No. 2 and No. 3. Is there continuity? YES - Repair short in the wires between the left-front suspension stroke sensor and the active damper control unit. NO - Go to step 12.
12. Check for continuity between active damper control unit connector A (20P) terminal No. 15 and left-front suspension stroke sensor 3P connector terminal No. 2. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the left-front suspension stroke sensor and the active damper control unit.
13. Check for continuity between headlight leveling control unit 16P connector terminal No. 13 and left-front suspension stroke sensor 3P connector terminal No. 1. Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the left-front suspension stroke sensor and the headlight leveling control unit.
14. Reconnect the headlight leveling control unit 16P connector.
15. Reconnect the active damper control unit connector A(20P)
16. Start the engine, and wait 5 seconds.
17. Measure voltage between body ground and left-front suspension stroke sensor 3P connector terminal No. 1. Is there about 5 V? YES - Replace the suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). NO - Check the headlight leveling control system. If necessary, substitute a known-good headlight leveling control unit.

DTC 2-B: Left-rear Suspension Stroke Sensor Signal Circuit Low Voltage

Note. If DTC 8-3 is stored at the same time as DTC 2-B, troubleshoot DTC 8-3 first, then recheck for DTC 2-B.

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 2-B indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the suspension stroke sensor and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the left-rear suspension stroke sensor 3P connector.
8. Disconnect active damper control unit connector B (14P).
9. Disconnect the headlight leveling control unit 16P connector.
10. Check for continuity between body ground and active damper control unit connector B (14P) terminal No. 7. Is there continuity? YES - Go to step 11. NO - Repair short to body ground in the wire between the left-rear suspension stroke sensor, the headlight leveling control unit, and the active damper control unit.
11. Check for continuity between left-rear suspension stroke sensor 3P connector terminals No. 2 and No. 3. Is there continuity? YES - Repair short in the wires between the left-rear suspension stroke sensor and the active damper control unit. NO - Go to step 12.
12. Check for continuity between active damper control unit connector B (14P) terminal No. 7 and left-rear suspension stroke sensor 3P connector terminal No. 2. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the left-rear suspension stroke sensor and the active damper control unit.
13. Check for continuity between headlight leveling control unit 16P connector terminal No. 5 and left-rear suspension stroke sensor 3P connector terminal No. 1. Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the left-rear suspension stroke sensor and the headlight leveling control unit.
14. Reconnect the headlight leveling control unit 16P connector.
15. Reconnect the active damper control unit connector B (14P).
16. Start the engine, and wait 5 seconds.
17. Measure voltage between body ground and left-rear suspension stroke sensor 3P connector terminal No. 1. Is there about 5 V? YES - Replace the suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). NO - Check the headlight leveling control system. If necessary, substitute a known-good headlight leveling control unit.

Scheme 58

1. Turn the ignition switch to LOCK (0).
2. Check that the right-rear and left-rear suspension stroke sensors are properly mounted (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ), and check for bent to damaged sensor links. NOTE: After troubleshooting for the left side suspension stroke sensor, do the headlight initial position learning procedure (see «HEADLIGHT INITIAL POSITION LEARNING PROCEDURE»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__headlight-initial-position-learning-procedure) ). Are they OK? YES - Go to step 3. NO - Reinstall or replace the appropriate suspension stroke sensor, or linkage (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).
3. Remove the right-rear and left-rear suspension stroke sensors (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ). Do not disconnect the sensor connector. NOTE: After troubleshooting for the left side suspension stroke sensor, do the headlight initial position learning procedure (see «HEADLIGHT INITIAL POSITION LEARNING PROCEDURE»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__headlight-initial-position-learning-procedure) ).
4. Start the engine, and wait 5 seconds.
5. Check the SUS STROKE_S VOLTAGE (RR), or (LR) in the ACTIVE DAMPER SYSTEM DATA LIST with the HDS while moving the suspension stroke sensor arm through a complete stroke. Compare the voltage/rotation angle between the chart and the measurements. NOTE: The voltage should increase (decrease) within 90 degrees of the sensor arm rotation from the first voltage change point. Is the voltage as specified? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Replace the appropriate suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).

DTC 3-1: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Range/Performance Problem (Yaw Rate Signal-Lateral Acceleration Signal Incorrect Correlation); DTC 3-3: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Malfunction (Lateral Acceleration Sensor); DTC 3-6: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Malfunction (Yaw Rate Sensor); DTC 3-7: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Range/Performance Problem (Wheel Speed Signal-Longitudinal Acceleration Signal Incorrect Correlation); DTC 3-9: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Malfunction (Longitudinal Acceleration Sensor); DTC 3-A: Yaw Rate-Lateral/Longitudinal Acceleration Sensor Malfunction

Note. If DTC 8-6 is stored at the same time as DTC 3-1, DTC 3-3, DTC 3-6, DTC 3-7, DTC 3-9, or DTC 3-A, troubleshoot DTC 8-6 first, then recheck for DTC 3-1, DTC 3-3, DTC 3-6, DTC 3-7, DTC 3-9, or DTC 3-A.

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Test-drive the vehicle around a corner for 2 seconds or more.
5. Check for DTCs with the HDS. Is DTC 3-1, 3-3, 3-6, 3-7, 3-9, or 3-A indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the yaw rate-lateral/longitudinal acceleration sensor and the active damper control unit.
6. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). Is any DTC indicated? YES - Go to the indicated VSA system DTCs troubleshooting. NO - Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Substitute a known-good yaw rate-lateral/ longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
9. Turn the ignition switch to ON (II).
10. Clear the DTC with the HDS.
11. Turn the ignition switch to LOCK (0).
12. Test-drive the vehicle around a corner for 2 seconds or more.
13. Check for DTCs with the HDS. Is DTC 3-1, 3-3, 3-6, 3-7, 3-9, or 3-A indicated? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Replace the original yaw rate-lateral/ longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).

DTC 3-4: Wheel Speed Signal Malfunction (From VSA Modulator-control Unit by F-CAN)

Note. If DTC 8-6 is stored at the same time as DTC 3-4, troubleshoot DTC 8-6 first, then recheck for DTC 3-4.

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Test-drive the vehicle around corners at 10 mph (15 km/h) or more.
5. Check for DTCs with the HDS. Is DTC 3-4 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the VSA modulator-control unit and the active damper control unit.
6. Check for VSA system DTCs with the DTS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). Is any DTC indicated? YES - Go to the indicated VSA system DTCs troubleshooting. NO - Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Substitute a known-good active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
9. Turn the ignition switch to ON (II).
10. Clear the DTC with the HDS.
11. Turn the ignition switch to LOCK (0).
12. Test-drive the vehicle around corners at 10 mph (15 km/h) or more.
13. Check for DTCs with the HDS. Is DTC 3-4 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

DTC 5-1: Active Damper Control Unit Internal Right-front Damper Coil Drive Circuit Stuck ON; DTC 5-2: Active Damper Control Unit Internal Left-front Damper Coil Drive Circuit Stuck ON; DTC 5-3: Active Damper Control Unit Internal Right-rear Damper Coil Drive Circuit Stuck ON; DTC 5-4: Active Damper Control Unit Internal Left-rear Damper Coil Drive Circuit Stuck ON; DTC 7-1: Active Damper Control Unit Internal Circuit Malfunction; DTC 7-2: Active Damper Control Unit Internal Circuit Malfunction; DTC 7-3: Active Damper Control Unit Internal Circuit Malfunction; DTC 7-4: Active Damper Control Unit Internal Circuit Malfunction; DTC 7-5: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-1: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-2: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-5: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-6: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-7: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-8: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-A: Active Damper Control Unit Internal Circuit Malfunction; DTC 14-C: Active Damper Control Unit Internal Circuit Malfunction

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 5-1, 5-2, 5-3, 5-4, 7-1, 7-2, 7-3, 7-4, 7-5, 14-1, 14-2, 14-5, 14-6, 14-7, 14-8, 14-A, or 14-C indicated? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections at the active damper control unit.

Scheme 59

Scheme 60

Scheme 61

Scheme 62

1. Turn the ignition switch OFF.
2. Disconnect the appropriate damper coil 2P connector, then reconnect the connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Damper Coil 5-5 Right-front 5-6 Left-front 5-7 Right-rear 5-8 Left-rear
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Turn the ignition switch to LOCK (0).
6. Start the engine.
7. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
8. Check for DTCs with the HDS. Is DTC 5-5, 5-6, 5-7, or 5-8 indicated? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the damper coil and the active damper control unit.
9. Turn the ignition switch to LOCK (0).
10. Disconnect active damper control unit connector A (20P).
11. Turn the ignition switch to ON (II).
12. Measure voltage between body ground and the appropriate active damper control unit connector A (20P) terminal. CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal 5-5 No. 6 5-6 No. 4 5-7 No. 2 5-8 No. 1 Is there battery voltage? YES - Repair short to power in the wire between the appropriate damper coil and the active damper control unit, then go to step 18 . NO - Go to step 13.
13. Turn the ignition switch to LOCK (0).
14. Measure resistance between the appropriate active damper control unit connector A (20P) terminals (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal 5-5 No. 6 No. 16 5-6 No. 4 No. 14 5-7 No. 2 No. 12 5-8 No. 1 No. 11 Is the resistance between 0.6-2.0 ohms ? YES - Check for loose terminals in the active damper control unit connector A (20P). If the terminals are OK, replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ), then go to step 19 . NO - Go to step 15.
15. Disconnect the appropriate damper coil 2P connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Damper Coil 5-5 Right-front 5-6 Left-front 5-7 Right-rear 5-8 Left-rear
16. Check for continuity between the appropriate active damper control unit connector A (20P) terminal and appropriate damper coil 2P connector terminal No. 1 (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal Appropriate Damper Coil 5-5 No. 6 Right-front 5-6 No. 4 Left-front 5-7 No. 2 Right-rear 5-8 No. 1 Left-rear Is there continuity? YES - Go to step 17. NO - Repair open in the wire between the appropriate damper coil and the active damper control unit, then go to step 19 .
17. Check for continuity between the appropriate active damper control unit connector A (20P) terminal and appropriate damper coil 2P connector terminal No. 2 (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal Appropriate Damper Coil 5-5 No. 16 Right-front 5-6 No. 14 Left-front 5-7 No. 12 Right-rear 5-8 No. 11 Left-rear Is there continuity? YES - Replace the appropriate damper unit: Front (see «DAMPER/SPRING REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension__damperspring-removal-and-installation) ), rear (see «DAMPER REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ) then go to step 19 . NO - Repair open in the wire between the appropriate damper coil and the active damper control unit, then go to step 19 .
18. Turn the ignition switch to LOCK (0).
19. Reconnect all connectors.
20. Turn the ignition switch to ON (II).
21. Clear the DTC with the HDS.
22. Turn the ignition switch to LOCK (0).
23. Start the engine.
24. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
25. Check for DTCs with the HDS. Is any DTC indicated? YES - Go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

Scheme 63

1. Turn the ignition switch to LOCK (0).
2. Disconnect the appropriate damper coil 2P connector, then reconnect the connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Damper Coil 6-1 Right-front 6-2 Left-front 6-3 Right-rear 6-4 Left-rear
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Turn the ignition switch to LOCK (0).
6. Start the engine.
7. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
8. Check for DTCs with the HDS. Is DTC 6-1, 6-2, 6-3, or 6-4 indicated? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time. Check for poor or lose connections between the damper coil and the active damper control unit.
9. Turn the ignition switch to LOCK (0).
10. Disconnect the appropriate damper coil 2P connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Damper Coil 6-1 Right-front 6-2 Left-front 6-3 Right-rear 6-4 Left-rear
11. On the damper, measure resistance between appropriate damper coil terminals No. 1 and No. 2. Is the resistance between 0.4-1.5 ohms ? YES - Repair open or high resistance in the wires between the damper coil and the active damper control unit, then go to step 12. NO - Replace the appropriate damper unit: Front (see «DAMPER/SPRING REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension__damperspring-removal-and-installation) ), rear (see «DAMPER REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ) then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II).
14. Clear the DTC with the HDS.
15. Turn the ignition switch to LOCK (0).
16. Start the engine.
17. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
18. Check for DTCs with the HDS. Is any DTC indicated? YES - Go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

Scheme 64

Scheme 65

Scheme 66

Scheme 67

1. Turn the ignition switch OFF.
2. Disconnect the appropriate damper coil 2P connector, then reconnect the connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Damper Coil 6-5 Right-front 6-6 Left-front 6-7 Right-rear 6-8 Left-rear
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Turn the ignition switch to LOCK (0).
6. Start the engine.
7. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
8. Check for DTCs with the HDS. Is DTC 6-5, 6-6, 6-7, or 6-8 indicated? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the damper coil and the active damper control unit.
9. Turn the ignition switch to LOCK (0).
10. Disconnect active damper control unit connector A (20P).
11. Measure resistance between the appropriate active damper control unit connector A (20P) terminals (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal 6-5 No.6 No.16 6-6 No.4 No.14 6-7 No.2 No.12 6-8 No.1 No.11 Is the resistance between 0.6-2.0 ohms ? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ), then go to step 16 . NO - Go to step 12.
12. Disconnect the appropriate damper coil 2P connector. CONNECTOR TERMINAL REFERENCE DTC Appropriate Damper Coil 6-5 Right-front 6-6 Left-front 6-7 Right-rear 6-8 Left-rear
13. Check for continuity between body ground and appropriate damper coil 2P connector terminals No. 1 and No. 2 individually (see table). CONNECTOR TERMINAL REFERENCE DTC Damper Coil Sign/Terminal Sign/Terminal 6-5 CFRH/No.1 CFRL/No.2 6-6 CFLH/No.1 CFLL/No.2 6-7 CRRH/No.1 CRRL/No.2 6-8 CRLH/No.1 CRLL/No.2 Is there continuity? YES - Repair short to body ground in the wire between the appropriate damper coil and active damper control unit, then go to step 16 . NO - Go to step 14.
14. Check for continuity between the appropriate active damper control unit connector A (20P) terminal and appropriate damper coil 2P connector terminal No. 1 (see table). CONNECTOR TERMINAL REFERENCE DTC Active Damper Control Unit Connector A Terminal Appropriate Damper Coil 6-5 No. 6 Right-front 6-6 No. 4 Left-front 6-7 No. 2 Right-rear 6-8 No. 1 Left-rear Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the appropriate damper coil and the active damper control unit, then go to step 16 .
15. Check for continuity between appropriate damper coil 2P connector terminals No. 1 and No. 2 (see table). CONNECTOR TERMINAL REFERENCE DTC Damper Coil Sign/Terminal Sign/Terminal 6-5 CFRH/No.1 CFRL/No.2 6-6 CFLH/No.1 CFLL/No.2 6-7 CRRH/No.1 CRRL/No.2 6-8 CRLH/No.1 CRLL/No.2 Is there continuity? YES - Repair short in the wires between the appropriate damper coil and the active damper control unit, then go to step 16. NO - Replace the appropriate damper unit: Front (see «DAMPER/SPRING REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension__damperspring-removal-and-installation) ), rear (see «DAMPER REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ), then go to step 16.
16. Reconnect all connectors.
17. Turn the ignition switch to ON (II).
18. Clear the DTC with the HDS.
19. Turn the ignition switch to LOCK (0).
20. Start the engine.
21. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
22. Check for DTCs with the HDS. Is any DTC indicated? YES - Go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

Scheme 68

Scheme 69

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 6-9 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the main under-hood fuse box and the active damper control unit. Check for a loose or poor ground at G302 and G401.
6. Turn the ignition switch to LOCK (0).
7. Check the No. 7 (30 A) fuse in the main under-hood fuse box. Is the fuse blown? YES - With removing the fuse, then go to step 8. NO - Reinstall the fuse, then go to step 11 .
8. Disconnect active damper system control unit connector A (20P).
9. Check for continuity between body ground and active damper system control unit connector A (20P) terminal No. 10. Is there continuity? YES - Repair short to body ground in the wire between the No. 7 (30 A) fuse in the main under-hood fuse box and the active damper system control unit. NO - Install a new No. 7 (30 A) fuse in the main under-hood fuse box, then go to step 10.
10. Reconnect active damper system control unit connector A (20P).
11. Measure voltage between active damper control unit connector A (20P) terminals No. 10 and No. 18. Is there battery voltage? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ), then go to step 12. NO - Repair open in the wire between the active damper control unit and the No. 7 (30 A) fuse in the main under-hood fuse box, or an open or poor connection between active damper control unit and body ground (G401), then go to step 12.
12. Turn the ignition switch to ON (II).
13. Clear the DTC with the HDS.
14. Turn the ignition switch to LOCK (0).
15. Start the engine.
16. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
17. Check for DTCs with the HDS. Is any DTC indicated? YES - Go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

DTC 7-6: Active Damper Control Unit Internal Circuit Malfunction (Fail Safe Relay Stuck On)

Note. The fail safe relay is built into the active damper control unit.

Scheme 70

1. Turn the ignition switch to LOCK (0).
2. Check that the all four damper coil 2P connectors are properly connected. Are the connectors OK? YES - Go to step 3. NO - Reconnect and check the connectors, then go to step 12 .
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Turn the ignition switch to LOCK (0).
6. Start the engine, and wait 5 seconds.
7. Check for DTCs with the HDS. Is DTC 7-6 indicated? YES - Go to step 8. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the damper coil and the active damper control unit.
8. Turn the ignition switch to LOCK (0).
9. Disconnect active damper control unit connector A (20P).
10. Check for continuity between the active damper control unit connector A (20P) terminals individually (see table). CONNECTOR TERMINAL REFERENCE Appropriate Damper Coil Active Damper Control Unit Connector A Terminal Right-front No. 6 No. 16 Left-front No. 4 No. 14 Right-rear No. 2 No. 12 Left-rear No. 1 No. 11 Is there continuity? YES - Check for poor or loose connections in the active damper control unit, clean body ground terminals G302 and G401. If the connections and the terminal are OK, replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ), then go to step 11. NO - Repair open in the wires between the damper coil and active damper control unit, then go to step 11.
11. Reconnect all connectors.
12. Turn the ignition switch to ON (II).
13. Clear the DTC with the HDS.
14. Turn the ignition switch to LOCK (0).
15. Start the engine.
16. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
17. Check for DTC's with the HDS. Is any DTC indicated? YES - Go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.

DTC 7-9: Active Damper Control Unit Internal Circuit Malfunction

Note. If DTC 5-5, DTC 5-6, DTC 5-7, or DTC 5-8 stored at the same time as DTC 7-9, troubleshoot DTC 5-5, DTC 5-6, DTC 5-7, or DTC 5-8 first, then recheck for DTC 7-9.

Scheme 71

Scheme 72

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 7-9 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the damper coil and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect active damper control unit connector A (20P).
8. Check for continuity between the active damper control unit connector A (20P) terminals individually (see table). CONNECTOR TERMINAL REFERENCE Appropriate Damper Coil Active Damper Control Unit Connector A Terminal Right-front No. 6 No. 16 Left-front No. 4 No. 14 Right-rear No. 2 No. 12 Left-rear No. 1 No. 11 Is there continuity? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ), then go to step 11 . NO - Go to step 9.
9. Disconnect the appropriate damper coil 2P connectors.
10. On the damper, check for continuity between damper coil 2P connector terminals No. 1 and No. 2 for all four dampers. Is there continuity? YES - Repair open in the wire between the damper coil and active damper control unit, then go to step 11. NO - Replace the damper unit: Front (see «DAMPER/SPRING REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#front-suspension__damperspring-removal-and-installation) ), rear (see «DAMPER REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-hubs/#rear-suspension) ), then go to step 11.
11. Reconnect all connectors.
12. Turn the ignition switch to ON (II).
13. Clear the DTC with the HDS.
14. Turn the ignition switch to LOCK (0).
15. Start the engine.
16. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
17. Check for DTCs with the HDS. Is any DTC indicated? YES - Go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

Scheme 73

Scheme 74

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 8-2 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the vertical acceleration sensor, the suspension stroke sensor, and the active damper control unit.
6. Clear the DTC with the HDS.
7. Turn the ignition switch to LOCK (0).
8. Disconnect the right-front suspension stroke sensor 3P connector.
9. Start the engine, and wait 5 seconds.
10. Check for DTCs with the HDS. Is DTC 8-2 indicated? YES - Go to step 11. NO - Replace the right-front suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).
11. Clear the DTC with the HDS.
12. Turn the ignition switch to LOCK (0).
13. Disconnect the right-rear suspension stroke sensor 3P connector.
14. Start the engine, and wait 5 seconds.
15. Check for DTCs with the HDS. Is DTC 8-2 indicated? YES - Go to step 16. NO - Replace the right-rear suspension stroke sensor (see «SUSPENSION STROKE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/headlights/#headlight-leveling-system__suspension-stroke-sensor-replacement) ).
16. Clear the DTC with the HDS.
17. Turn the ignition switch to LOCK (0).
18. Disconnect the front vertical acceleration sensor 3P connector.
19. Start the engine, and wait 5 seconds.
20. Check for DTCs with the HDS. Is DTC 8-2 indicated? YES - Go to step 21. NO - Replace the front vertical acceleration sensor (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ).
21. Clear the DTC with the HDS.
22. Turn the ignition switch to LOCK (0).
23. Disconnect the right-rear vertical acceleration sensor 3P connector.
24. Start the engine, and wait 5 seconds.
25. Check for DTCs with the HDS. Is DTC 8-2 indicated? YES - Go to step 26. NO - Replace the right-rear vertical acceleration sensor (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ).
26. Clear the DTC with the HDS.
27. Turn the ignition switch to LOCK (0).
28. Disconnect the left-rear vertical acceleration sensor 3P connector.
29. Start the engine, and wait 5 seconds.
30. Check for DTCs with the HDS. Is DTC 8-2 indicated? YES - Go to step 31. NO - Replace the left-rear vertical acceleration sensor (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ).
31. Turn the ignition switch to LOCK (0).
32. Disconnect active damper control unit connector B (14P).
33. Check for continuity between body ground and active damper control unit connector B (14P) terminal No. 4. Is there continuity? YES - Repair short to body ground in the wire between the right-front/right-rear suspension stroke sensors, the front/right-rear/left-rear vertical acceleration sensors, and the active damper control unit. NO - Go to step 34.
34. Check for continuity between active damper control unit connector B (14P) terminals No. 4 and No. 11. Is there continuity? YES - Repair short between the wires (SVCC line and SG line). NO - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

Scheme 75

Scheme 76

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 8-3 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the suspension stroke sensor, the headlight leveling control unit, and the active damper control unit.
6. Turn the ignition switch to LOCK (0).
7. Disconnect the headlight leveling control unit 16P connector.
8. Disconnect the left-front suspension stroke sensor 3P connector.
9. Disconnect active damper control unit connector B (14P) connector.
10. Check for continuity between body ground and active damper control unit connector B (14P) terminal No. 6. Is there continuity? YES - Repair short to body ground in the wire between the left-front suspension stroke sensor, the headlight leveling control unit, and the active damper control unit. NO - Go to step 11.
11. Check for continuity between headlight leveling control unit 16P connector terminals No. 4 and No. 13, and terminals No. 12 and No. 13 individually. Is there continuity? YES - Repair short between the wires (SVCC line and SG line). NO - Go to step 12.
12. Reconnect all connectors.
13. Start the engine, and wait 5 seconds.
14. Check the HVCC VOLTAGE in the ACTIVE DAMPER SYSTEM DATA LIST with the HDS. Is there 4.36 V or more indicated? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Go to step 15.
15. Turn the ignition switch to LOCK (0).
16. Substitute a known-good headlight leveling control unit.
17. Turn the ignition switch to ON (II).
18. Clear the DTC with the HDS.
19. Turn the ignition switch to LOCK (0).
20. Start the engine, and wait 5 seconds.
21. Check for DTCs with the HDS. Is DTC 8-3 indicated? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Replace the original headlight leveling control unit.

Scheme 77

1. Turn the ignition switch to ON (II).
2. Clear the active damper system DTC and VSA system DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 8-5 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the yaw rate-lateral/longitudinal acceleration sensor and the active damper control unit.
6. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). Are any DTC indicated? YES - Go to the indicated VSA system DTCs troubleshooting. NO - Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Wait 30 seconds or more.
9. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
10. Disconnect active damper control unit connector B (14P) connector.
11. Check for continuity between the active damper control unit connector B (14P) terminals and the yaw rate-lateral/longitudinal acceleration sensor 4P connector terminals individually (see table). CONNECTOR TERMINAL REFERENCE Sign Active Damper Control Unit Connector B Terminal Yaw Rate-lateral /Longitudinal Acceleration Sensor Connector Terminal CANL No. 8 No. 2 CANH No. 1 No. 3 Is there continuity? YES - Go to step 12. NO - Repair open in the wire between the yaw rate-lateral/longitudinal acceleration sensor and the active damper control unit.
12. Substitute a known-good active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Clear the DTC with the HDS.
16. Turn the ignition switch to LOCK (0).
17. Start the engine, and wait 5 seconds.
18. Check for DTCs with the HDS. Is DTC 8-5 indicated? YES - Replace the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ). NO - Replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

Scheme 78

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and wait 5 seconds.
5. Check for DTCs with the HDS. Is DTC 8-6 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor or loose connections between the VSA modulator-control unit and the active damper control unit.
6. Check for VSA system DTCs with the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). Are any DTC indicated? YES - Go to the indicated VSA system DTCs troubleshooting, then go to step 14 . NO - Go to step 7.
7. Turn the ignition switch to LOCK (0).
8. Wait 30 seconds or more.
9. Disconnect the VSA modulator-control unit 46P connector.
10. Disconnect active damper control unit connector B (14P) connector.
11. Check for continuity between the active damper control unit connector B (14P) terminals and the VSA modulator-control unit 46P connector terminals individually (see table). CONNECTOR TERMINAL REFERENCE Sign Active Damper Control Unit Connector B Terminal VSA Modulator-Control Unit Connector Terminal CANL No. 8 No. 38 CANH No. 1 No. 39 Is there continuity? YES - Go to step 12 NO - Repair open in the wire between the VSA modulator-control unit and the active damper control unit.
12. Substitute a known-good active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Clear the DTC with the HDS.
16. Turn the ignition switch to LOCK (0).
17. Start the engine, and wait 5 seconds.
18. Check for DTCs with the HDS. Is DTC 8-6 indicated? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

Scheme 79

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine, and raise the engine speed to 2,000 rpm.
5. Check and note IG1 VOLTAGE in the ACTIVE DAMPER SYSTEM DATA LIST with the HDS within 40 seconds after starting the engine. Was there within 9.3-17.5 V for 30 seconds continuously? YES - Go to step 12 . NO - Go to step 6.
6. With engine idle speed, wait 40 seconds.
7. Raise the engine speed to 2,000 rpm.
8. Measure voltage between active damper control unit connector A (20P) terminals No. 8 and No. 18. Is there any voltage? YES - If the voltage is above 17.5 V, check the battery (see «BATTERY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#battery) ), and troubleshoot the alternator and regulator circuit (see «ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ), then go to step 9. If voltage is normal, replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Repair poor connection between under-dash fuse/relay box connector F (14P) terminal No. 8, and active damper control unit connector A (20P) terminal No. 8, or poor ground at G302 and G401, then go to step 9.
9. Clear the DTC with the HDS.
10. Turn the ignition switch to LOCK (0).
11. Start the engine.
12. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS.
13. Check for DTCs with the HDS. Is any DTC indicated? YES - Go to the indicated DTCs troubleshooting. NO - Troubleshooting is complete.

Note. Check for gauge DTCs with the HDS (see GENERAL TROUBLESHOOTING INFORMATION ). If gauge DTCs are stored, troubleshoot those DTCs first.

Scheme 80

Scheme 81

Scheme 82

1. Check for the communication between the vehicle and the HDS. Is there communication with all vehicle systems? YES - Check for loose terminals in the gauge control module connector A (12P). If necessary, substitute a known-good gauge control module, then recheck. If it is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). NO - If the HDS does not communicate with all the systems of the vehicle, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ). If the HDS does not communicate with only the active damper control unit, go to step 2.
2. Turn the ignition switch to LOCK (0).
3. Check the No. 20 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse blown? YES - Install the No.20 (7.5 A) fuse, and recheck. If the fuse continues to blow, check for short to body ground in the wire between the No. 20 (7.5 A) fuse and the active damper control unit. NO - Reinstall the fuse, then go to step 4.
4. Turn the ignition switch to ON (II).
5. Measure voltage between body ground and active damper control unit connector A (20P) terminal No. 8. Is there battery voltage? YES - Go to step 6. NO - Repair open in the wire between the active damper control unit and the No. 20 (7.5 A) fuse in the under-dash fuse/relay box.
6. Measure voltage between body ground and active damper control unit connector A (20P) terminals No. 18 and No. 19 individually. Is there less than 0.5 V? YES - Go to step 7. NO - Repair open in the wire between the active damper control unit and body ground (G401 or G302).
7. Turn the ignition switch to LOCK (0).
8. Disconnect gauge control module connector A (12P).
9. Disconnect active damper control unit connector B (14P).
10. Check for continuity between the active damper control unit connector B (14P) terminals and the gauge control module connector A (12P) terminals individually (see table). CONNECTOR TERMINAL REFERENCE Sign Active Damper Control Unit Connector B Terminal Gauge Control Module Connector A Terminal CANL No. 8 No. 6 CANH No. 1 No. 12 Is there continuity? YES - Check for loose terminals in the active damper control unit connectors A (20P)/B (14P). If necessary, substitute a known-good active damper control unit, then recheck. If it is OK, replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Repair open in the wire between the gauge control module and the active damper control unit.

Scheme 83

Scheme 84

Scheme 85

Scheme 86

1. Turn the ignition switch to LOCK (0).
2. Check the No. 21 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 3. NO - Replace the blown fuse.
3. Disconnect active damper system switch 5P connector.
4. Turn the ignition switch to ON (II).
5. Measure voltage between body ground and active damper system switch 5P connector terminal No. 2. Is there battery voltage? YES - Go to step 6. NO - Repair open in the wire between the under-dash fuse/relay box and the active damper system switch.
6. Turn the ignition switch to LOCK (0).
7. Check the active damper system switch (see «ACTIVE DAMPER SYSTEM SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). Is the active damper system switch OK? YES - Go to step 8. NO - Replace the active damper system switch (see «ACTIVE DAMPER SYSTEM SWITCH TEST»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
8. Disconnect gauge control module connector B (24P).
9. Check for continuity between gauge control module connector B (24P) terminal No. 19 and the active damper system switch 5P connector terminal No. 1. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between the gauge control module and the active damper system switch.
10. Turn the ignition switch to ON (II).
11. Measure voltage between body ground and active damper system switch 5P connector terminal No. 1. Is there more than 0.1 V? YES - Repair short to power in the wire between the gauge control module and the active damper system switch. NO - Go to step 12.
12. Turn the ignition switch to LOCK (0).
13. Disconnect gauge control module connector A (12P).
14. Check for continuity between gauge control module connector A (12P) terminal No. 3 and the active damper system switch 5P connector terminal No. 3. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the gauge control module and the active damper system switch.
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Operate the active damper system switch, and check the mode selected light. The light turns ON (OFF) to OFF (ON)? YES - Check for loose terminals in the active damper control unit connectors A (20P)/B (14P). If necessary, substitute a known-good active damper control unit, then recheck. If it is OK, replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Check for loose terminals in the gauge control module connectors A (12P)/B (24P). If necessary, substitute a known-good gauge control module, then recheck. If it is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).

Scheme 87

1. Turn the ignition switch to LOCK (0).
2. Remove the cargo rear trim panel (see «TRIM REMOVAL/INSTALLATION - CARGO AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-cargo-area) ).
3. Remove the mounting bolts, and pull out the active damper control unit (A).
4. Disconnect the active damper control unit connectors (B).
5. Install the active damper control unit in the reverse order of removal. NOTE: Do not pinch the wire harnesses between the frame and the active damper control unit.
6. Do the memorizing rear suspension full rebound position (see «MEMORIZING REAR SUSPENSION FULL REBOUND POSITION»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__memorizing-rear-suspension-full-rebound-position) ).
7. Start the engine, then make sure there are no active damper system DTCs with the HDS (see «HOW TO RETRIEVE DTCS AND FREEZE DATA WITH THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
8. Do the DAMPER FORCE OPERATION in the ACTIVE DAMPER SYSTEM INSPECTION MENU with the HDS, then make sure the all four damper units function normally.
9. Test-drive the vehicle, and check that the active damper system indicator does not come on (see «ACTIVE DAMPER SYSTEM DAMPER UNITS»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

Vertical Acceleration Sensor Replacement

Note. This vehicle has one front vertical acceleration sensor and two rear vertical acceleration sensors on both right and left sides.

Scheme 88

1. Turn the ignition switch to LOCK (0).
2. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#dashboard) ).
3. Remove the TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ).
4. Remove the sensor mounting nuts, and pull out the vertical acceleration sensor (A).
5. Disconnect the vertical acceleration sensor connector (B).
6. Install the vertical acceleration sensor in the reverse order of removal.
7. Test-drive the vehicle, and check that the active damper system indicator does not come on (see «ACTIVE DAMPER SYSTEM DAMPER UNITS»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

Scheme 89

1. Turn the ignition switch to LOCK (0).
2. Remove the appropriate side of the rear side trim panel (see «TRIM REMOVAL/INSTALLATION - REAR SIDE AREA»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#interior-trim__trim-removalinstallation-rear-side-area) ).
3. Remove the sensor mounting nuts, and pull out the vertical acceleration sensor (A). NOTE: The illustration shows the left side of the vehicle, the right side is similar.
4. Disconnect the vertical acceleration sensor connector (B).
5. Install the vertical acceleration sensor in the reverse order of removal.
6. Test-drive the vehicle, and check that the active damper system indicator does not come on (see «ACTIVE DAMPER SYSTEM DAMPER UNITS»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).

Scheme 90

1. Turn the ignition switch to LOCK (0).
2. Remove the vertical acceleration sensor (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ). Do not disconnect the sensor connector.
3. Connect the HDS to the data link connector (DLC) (see «HOW TO RETRIEVE DTCS AND FREEZE DATA WITH THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
4. Start the engine, and wait 5 seconds.
5. With the HDS, check the VERTICALS VOLTAGE (F), (RR), or (LR) in the active damper system DATA LIST at a "normal", "lay down", and "top down" each sensor positions by moving it (see table). VOLTAGE REFERENCE Sensor position Specified voltage Normal 2.2-2.8 V Lay down 1.2-1.8 V Top down 0.2-0.8 V
6. If the voltages shown on the HDS are within the specified voltage in the all positions, the sensor is OK. If the voltages are out of specification in only one position, the sensor is faulty.
7. Turn the ignition switch to LOCK (0).
8. Install the vertical acceleration sensor in the proper position (see «VERTICAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system__vertical-acceleration-sensor-replacement) ).

Scheme 91

Scheme 92

Scheme 93

1. Turn the ignition switch to LOCK (0).
2. Remove the center console (see «CENTER CONSOLE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#consoles__center-console-removalinstallation) ).
3. Remove the center console box (see «CENTER CONSOLE BOX REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/exteriorinterior-trim/#consoles__center-console-box-replacement) ).
4. Push out the active damper system switch (A) from the back of the center console.
5. Disconnect the active damper system switch connector (B).
6. Check for continuity between the active damper system switch connector terminals in each switch position according to (Scheme 93).
7. If the continuity is not as specified, replace the illumination bulb or the switch.

See also:
• DLC CIRCUIT TROUBLESHOOTING
• LIFT AND SUPPORT POINTS
• SUSPENSION STROKE SENSOR REPLACEMENT
• SELF-DIAGNOSTIC FUNCTION
• HEADLIGHT INITIAL POSITION LEARNING PROCEDURE
• GENERAL TROUBLESHOOTING INFORMATION
• YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• DAMPER/SPRING REMOVAL AND INSTALLATION
• DAMPER REPLACEMENT
• BATTERY TEST
• ALTERNATOR AND REGULATOR CIRCUIT TROUBLESHOOTING
• GENERAL TROUBLESHOOTING INFORMATION
• GAUGE CONTROL MODULE REPLACEMENT
• TRIM REMOVAL/INSTALLATION - CARGO AREA
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• TPMS CONTROL UNIT REPLACEMENT
• TRIM REMOVAL/INSTALLATION - REAR SIDE AREA
• CENTER CONSOLE REMOVAL/INSTALLATION
• CENTER CONSOLE BOX REPLACEMENT
• 1-1
• 1-4
• 2-8
• 2-9
• 2-B
• 3-1
• 3-4
• 5-1
• 7-6
• 7-9
• VERTICAL ACCELERATION SENSOR REPLACEMENT
• MEMORIZING REAR SUSPENSION FULL REBOUND POSITION