Adaptive Damping Components
ADCM/ Component RelationshipThree accelerometers sense vehicle body movement and generate an analog voltage (+5V max.) output, which is proportional to the vehicle body movement. These voltages are supplied to the Adaptive Damping Control Module (ADCM).
At 0g. (no movement of the body) each vertical accelerometer outputs approximately 2.5V steady voltage. The lateral accelerometer outputs approximately 1.5V. The voltage output due to body movement is proportional to acceleration in the acceleration axis, up to approximately 4.5V and down to approximately 0.5V.
The ADCM is hardwired to the Instrument Cluster. Should a fault occur, the ADCM grounds the System Error line which switches on the amber warning lamp and displays the message SUSPENSION FAILURE on the message center.
Refer to PDU User Guide
Refer to the PDU User Guide for details of diagnosing and testing the Adaptive Damping System. The PDU interrogates the ADCM directly via the K and L lines to the diagnostic socket.
The PDU will give an indication of the integrity of each electronic and electrical component. It will indicate, for example, that the accelerometers are not broken, but not that they functioning correctly when the vehicle is in motion. However, it is exceptional for an accelerometer to function incorrectly in its dynamic mode if it is proved to be functioning when static.
Basic Checks
Before changing any component, refer to the circuit diagrams and check the continuity of relevant harness circuits; in some instances, the PDU will not differentiate between a faulty component and a damaged connection or wiring.
Check the System Error line from the ADCM to the Instrument Cluster - Fascia Harness pin FC025/006.
Check the Road Speed Output from the Instrument Cluster to the ADCM - Fascia Harness pin FC026/007.
Check any relevant connections to confirm that the connection is electrically sound and that a terminal pin has not been pushed back into the connector shell, i.e. not making a connection to its mating pin / socket.
Check the following fuses in the luggage compartment fuse box: Fuse No. 2 (20A) and Fuse No. 4 (5A).
Connector Pin Identity Chart for BT069
Refer to PDU User Guide
Refer to the PDU User Guide for details of diagnosing and testing the Adaptive Damping System. The PDU interrogates the ADCM directly via the K and L lines to the diagnostic socket.
The PDU will give an indication of the integrity of each electronic and electrical component. It will indicate, for example, that the accelerometers are not broken, but not that they functioning correctly when the vehicle is in motion. However, it is exceptional for an accelerometer to function incorrectly in its dynamic mode if it is proved to be functioning when static.
Basic Checks
Before changing any component, refer to the circuit diagrams and check the continuity of relevant harness circuits; in some instances, the PDU will not differentiate between a faulty component and a damaged connection or wiring.
Check the System Error line from the ADCM to the Instrument Cluster - Fascia Harness pin FC025/006.
Check the Road Speed Output from the Instrument Cluster to the ADCM - Fascia Harness pin FC026/007.
Check any relevant connections to confirm that the connection is electrically sound and that a terminal pin has not been pushed back into the connector shell, i.e. not making a connection to its mating pin/socket.
Check the following fuses in the luggage compartment fuse box: Fuse No. 2 (20A) and Fuse No. 4 (5A).
Connector Pin Identity Chart for BT069