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

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

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.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Start the engine, and wait 5 seconds.
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. Refer to intermittent failures troubleshooting (see INTERMITTENT FAILURES ).
Turn the ignition switch to LOCK (0).
Disconnect active damper control unit connector A (20P) (see ACTIVE DAMPER CONTROL UNIT REPLACEMENT ).

Measure resistance between the appropriate active damper control unit connector A (20P) terminals (see table).

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

Fig 1: Measuring Resistance Between Active Damper Control Unit Connector A (20P) Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance between 0.6-2.0 Ω?

YES -Replace the active damper control unit (see ACTIVE DAMPER CONTROL UNIT REPLACEMENT ), then go to step 11.

NO -Go to step 9.

Disconnect the appropriate damper coil 2P connectors: Front (see step 3 under DAMPER/SPRING REMOVAL AND INSTALLATION ), rear (see step 3 under DAMPER REPLACEMENT )
On the damper, measure resistance between damper coil 2P connector terminals No. 1 and No. 2 for all four dampers.

Fig 2: Measuring Resistance Between Damper Coil 2P Connector Terminals No. 1 And No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the resistance between 0.4-1.5 Ω?

YES -Repair an 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 ), rear (see DAMPER REPLACEMENT ), then go to step 11.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Start the engine.
Do the DAMPER FORCE OPERATION TEST in the FUNCTIONAL TESTS MENU with the HDS.
Check for DTCs with the HDS.
Is any DTC indicated?

YES -Go to the indicated DTC'S TROUBLESHOOTING .

NO -Troubleshooting is complete.