http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on suspension ,then under subsystem suspension controls will pop in there on their own . Click the search button then the blue link. Looking at the diagrams i don't think there is much you'll be able to do. Computer in charge , testing for diagnostic trouble code's should be first step in diagnostic procedure . Be carefull you don't short out the control module .
Control Module Power and Ground
The vehicle dynamics control module (5A919) is located above the upper luggage compartment trim panel and lower module tray. Module power is provided by Circuit 418 (DG/Y) at Pins 36, 37, 56, 57, 58 and is powered through Fuse 7 (30A) in power distribution box. Module ground is provided through control module wire harness Pins 6, 39, 40 and 60.
The data link connector (14489) (DLC) is located in the passenger compartment under the instrument panel, 300 mm (12 inches) right of the steering column. This connector allows communications between the vehicle dynamics control module and either Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent or Rotunda Service Bay Diagnostics System (SBDS)® 001-00001 or equivalent.
When the CHECK RIDE CONTROL message is displayed in the message center indicator (10D898), a system error has been detected by the vehicle dynamics control module and is stored in the control module. This diagnostic trouble code (DTC) will be retained for the next 80 ignition switch cycles. If there is no repeat of the same error during these 80 ignition switch cycles, the control module will erase the DTC.
Because of this self-erasing memory, a customer may have had a concern "just a few days ago" that is not retrieved from memory when Diagnostic Test Mode (DTC) "Retrieve/Clear Continuous DTCs" is executed. This must be kept in mind if you must tell customer that no current concern has been found.
When the vehicle dynamics control module detects a concern, the air suspension system is disabled for the current ignition cycle. If the condition causing the concern clears up during the current ignition switch cycle, the system will not reactivate.
For example, if the customer has severely overloaded the luggage compartment, the system will not be able to trim the vehicle without exceeding the compressor run time. This will generate a DTC that disables the computer controlled suspension system. If the customer then drives the vehicle and unloads the luggage compartment without turning the ignition switch OFF, the system will not adjust for the new load. The customer will experience poor ride quality and the vehicle will not adjust trim.
Do you know what DTC'S - diagnostic trouble code's are ?
Vehicle Dynamics Module (VDM) Diagnostic Trouble Code (DTC) Index
DTC
Description
ACTION TO TAKE Only if Data Communication Link Test Passes and Customer Symptom Remains
B1317
VEHICLE DYNAMICS MODULE DETECTS HIGH BATTERY
GO to Pinpoint Test P .
B1318
VEHICLE DYNAMICS MODULE DETECTS LOW BATTERY
GO to Pinpoint Test N .
B1342
ECU DEFECTIVE
GO to Pinpoint Test M .
C1722
HEIGHT SENSOR PWR-SHORT TO B+
GO to Pinpoint Test B .
C1723
HEIGHT SENSOR PWR-SHORT TO GND
GO to Pinpoint Test A .
C1735
AIR SUSPENSION LR CORNER UP TIMEOUT
GO to Pinpoint Test V .
C1736
AIR SUSPENSION LR CORNER DOWN TIMEOUT
GO to Pinpoint Test U .
C1737
AIR SUSPENSION RR CORNER UP TIMEOUT
GO to Pinpoint Test V .
C1738
AIR SUSPENSION RR CORNER DOWN TIMEOUT
GO to Pinpoint Test U .
C1770
VENT SOLENOID-CKT FAILURE
GO to Pinpoint Test J .
C1773
VENT SOLENOID-SHORT TO GND
GO to Pinpoint Test H .
C1790
LR AIR SPRING SOLENOID-CKT FAILURE
GO to Pinpoint Test G .
C1793
LR AIR SPRING SOLENOID-SHORT TO GND
GO to Pinpoint Test F .
C1795
RR AIR SPRING SOLENOID-CKT SOLENOID
GO to Pinpoint Test G .
C1798
RR AIR SPRING SOLENOID-SHORT TO GND
GO to Pinpoint Test F .
C1820
COMPRESSOR THERMAL TIMEOUT EXCEEDED
GO to Pinpoint Test T .
C1840
DISABLE SWITCH-CKT FAILURE
GO to Pinpoint Test A .
C1842
DISABLE SWITCH-SHORT TO B+
GO to Pinpoint Test B .
C1882
RF HEIGHT SENSOR-OPEN CKT
GO to Pinpoint Test D .
C1883
RF HEIGHT SENSOR-SHORT TO B+
GO to Pinpoint Test C .
C1884
RF HEIGHT SENSOR-SHORT TO GND
GO to Pinpoint Test E .
C1886
RR HEIGHT SENSOR-OPEN CKT
GO to Pinpoint Test D .
C1887
RR HEIGHT SENSOR-SHORT TO B+
GO to Pinpoint Test C .
C1888
RR HEIGHT SENSOR-SHORT TO GND
GO to Pinpoint Test E .
C1890
LF HEIGHT SENSOR-OPEN CKT
GO to Pinpoint Test D .
C1891
LF HEIGHT SENSOR-SHORT TO B+
GO to Pinpoint Test C .
C1892
LF HEIGHT SENSOR SIGNAL-SHORT TO GND
GO to Pinpoint Test E .
C1894
LR HEIGHT SENSOR-OPEN CKT
GO to Pinpoint Test D .
C1895
LR HEIGHT SENSOR-SHORT TO B+
GO to Pinpoint Test C .
C1896
LR HEIGHT SENSOR-SHORT TO GND
GO to Pinpoint Test E .
C1898
VAPSII-CKT LOOP OPEN FAULT
GO to Pinpoint Test S .
C1901
RR SHOCK ACTUATOR-CKT FAILURE
GO to Pinpoint Test L .
C1904
RR SHOCK ACTUATOR-SHORT TO GND
GO to Pinpoint Test K .
C1905
LR SHOCK ACTUATOR-CKT FAILURE
GO to Pinpoint Test L .
C1908
LR SHOCK ACTUATOR-SHORT TO GND
GO to Pinpoint Test K .
C1909
RF SHOCK ACTUATOR-CKT FAILURE
GO to Pinpoint Test L .
C1912
RF SHOCK ACTUATOR-SHORT TO GND
GO to Pinpoint Test K .
C1913
LF SHOCK ACTUATOR-CKT FAILURE
GO to Pinpoint Test L .
C1916
LF SHOCK ACTUATOR-SHORT TO GND
GO to Pinpoint Test K .
C1929
FRONT COMP RELAY-CKT FAILURE
GO to Pinpoint Test R .
C1931
FRONT COMP RELAY-SHORT TO B+
GO to Pinpoint Test Q .
Your best bet , take your vehicle to a qualified repair shop !
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