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Suspension - Electronic Cv Road-Sensing Cadillac DeVille Concours I final

Electronic Suspension 9 illustrations ~10625 words

DESCRIPTION & OPERATION

Note. All models are also equipped with Electronic Level Control (ELC). For information on ELC system, see ELECTRONIC - LEVEL CONTROL - CADILLAC WITH CVRSS article.

Continuously Variable Road-Sensing Suspension (CVRSS) system performs 2 functions

  1. Controls firmness of vehicle ride (this part of the system is called CVRSS, although the term CVRSS is also applied to the entire system.
  2. Adjusts vehicle riding height (this part of the system is called Electronic Level Control, or ELC).

CVRSS control module monitors system for faults. If a fault occurs, codes are stored in memory. See SELF-DIAGNOSTICS under DIAGNOSIS & TESTING. Self-diagnostics also allows technician to monitor CVRSS system data, inputs and outputs.

CONTINUOUSLY VARIABLE ROAD-SENSING SUSPENSION (CVRSS)

Continuously Variable Road-Sensing Suspension (CVRSS) system can change firmness of vehicle ride in 10 milliseconds. Vehicle ride firmness is determined by how easily the strut or shock absorber can be compressed (damping characteristics). In each strut and shock absorber, damper oil flows through a damper that has 2 different sized orifices, one for firm mode and the other for soft mode. A damper actuator rotates the damper between positions (modes). Damper actuator is an integral part of strut and is not serviceable separately from strut. Damper actuators respond to command signals from CVRSS control module. CVRSS control module command signals are based on the following inputs.

CVRSS Position Sensors

These sensors (one mounted between body and each control arm) sense position of wheel in relation to body. CVRSS control module utilizes these inputs to control position of CVRSS damper actuators. If body or wheel motions are detected, CVRSS control module will command damper actuators to a soft or firm position.

CVRSS Damper Actuators

CVRSS shock absorbers/struts provide dampening by forcing fluid through internal orifices to resist suspension movement. Two levels of operation are achieved by redirecting oil flow using an actuator. Soft mode is accomplished by switching actuator on causing oil to bypass main damper. Firm mode is accomplished by switching actuator off causing oil to flow through main damper.

Vehicle Speed Sensor Signal

Powertrain Control Module (PCM) transmits vehicle speed signal to CVRSS control module. A second signal is transmitted via the class 2 serial data line. CVRSS control module utilizes these signals to determine amount of damper control and steering assist.

RTD BODY Relay

RTD BODY relay switches battery voltage to damper actuators. High-side of relay coil is connected to battery voltage through a fuse. Low-side of relay coil is connected to CVRSS control module through enable circuit.

Steering Wheel Position Sensor

Steering wheel position sensor sends steering wheel position data (angular) to CVRSS control module. Data is used to estimate vehicle lateral acceleration.

Lift/Dive Signal

Lift and dive occur when the vehicle accelerates and decelerates. When CVRSS control module receives an active lift/dive signal from PCM, all 4 damper actuators are commanded to a firm position. PCM calculates lift signal based on inputs from throttle position, transmission gear, vehicle speed and brake switch status. Dive signal is based on rate of change of vehicle speed.

ELECTRONIC LEVEL CONTROL (ELC)

Note. Only electrical testing and diagnosis of ELC system is covered in this article. For trouble shooting, component removal and installation, and system testing, see appropriate ELECTRONIC - LEVEL CONTROL article.

ELC system automatically raises and lowers vehicle to compensates for changes in riding height (trim height) that occur because of varying vehicle loads. To raise and lower vehicle, ELC system controls air pressure in adjustable rear shock absorbers. When riding height changes, a delay of about 7-27 seconds occurs before ELC system begins to operate.

Air pressure is supplied by a compressor that is powered by an electric motor. An exhaust solenoid on compressor vents system pressure when vehicle needs to be lowered. CVRSS control module controls the compressor and the exhaust solenoid based on inputs from position sensors. Position sensors sense position of wheel in relation to body.

ELECTRICAL COMPONENT LOCATIONS

ComponentLocation
CVRSS Control ModuleRight Front Corner Of Trunk
CVRSS Position SensorOn Control Arm Of Respective Wheel
Damper ActuatorIntegral Part Of Each Shock Absorber/Strut
Data Link Connector (DLC)Behind Left Side Of Dash
ELC CompressorOn Rear Suspension Support
ELC Compressor RelayIn Trunk, In Micro Relay Center
ELC Exhaust SolenoidPart Of ELC Compressor
Powertrain Control Module (PCM)Under Air Cleaner
RTD BODY RelayIn Trunk, In Micro Relay Center
Steering Wheel Position SensorAt Base of Steering Column

ELECTRICAL COMPONENT LOCATIONS

ELC TRIM HEIGHT

Note. This procedure requires a Tech 1 scan tool. DO NOT sit in vehicle during adjustment.

  1. Connect Tech 1 scan tool to Data Link Connector (DLC) located under left side of instrument panel. Park vehicle on level surface. Close doors. Ensure vehicle is unloaded. If any codes related to rear position sensors or dampers are set, repair cause of codes before continuing. Enter diagnostics. See «SELF-DIAGNOSTICS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) under DIAGNOSIS & TESTING.
  2. Turn ignition on, with engine off. Using scan tool, monitor RSS DATA RS D13 and RS D14. If voltages are not within normal range, check for bent or disconnected rear position sensors and repair as necessary. To adjust ELC trim height, follow instructions on Tech 1 scan tool.

STEERING AUTOCENTER

Note. This procedure requires a Tech 1 scan tool.

  1. Connect Tech 1 scan tool to Data Link Connector (DLC) located under left side of instrument panel. Enter diagnostics. See «SELF-DIAGNOSTICS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) under DIAGNOSIS & TESTING. Check for CVRSS steering sensor Code C1780. If code is set, diagnose and repair before continuing. Ensure wheels are in straight-ahead position and steering wheel is centered.
  2. Turn ignition on, engine off. Using scan tool, monitor RSS DATA RS D15. If voltage is not 2-3 volts, realign steering sensor. To adjust steering autocenter, follow instructions on Tech 1 scan tool.

CALIBRATING CVRSS CONTROL MODULE

Note. To ensure NEW CVRSS control module is calibrated for specific vehicle, Code C1658 is stored in memory. After replacing CVRSS control module, it must be calibrated. If NEW CVRSS control module is not calibrated, code cannot be cleared.

Ensure Tech 1 scan tool is equipped with latest version of chassis application program. Turn ignition off. Connect Tech 1 scan tool to Data Link Connector (DLC). Turn ignition on, engine off. To calibrate CVRSS control module, follow instructions on Tech 1 scan tool. Perform ELC trim height and steering autocenter adjustments. See ELC TRIM HEIGHT and STEERING AUTOCENTER .

CVRSS SYSTEM CHECK

  1. If this is the first time performing CVRSS system check for code, go to next step. If this is not the first time performing CVRSS system check for code, go to step 6 .
  2. Using Instrument Panel Cluster (IPC) on-board diagnostics, display and record all CVRSS codes and their status (current or history). If IPC displays NO RSS DATA, go to NO RSS DATA, LOSS OF SERIAL COMMUNICATION OR POWER for diagnosis. If IPC does not display NO RSS DATA, go to next step.
  3. If any current CVRSS codes are set, go to applicable code for diagnosis. See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table. If no current CVRSS codes are set, go to next step.
  4. Clear CVRSS codes. Road test vehicle driving faster than 50 MPH for 20 seconds and avoiding smooth road surfaces. DO NOT turn ignition off. After road test, using scan tool, cycle all CVRSS outputs. Wait 90 seconds. Using Instrument Panel Cluster (IPC) on-board diagnostics, display and record all CVRSS codes and their status (current or history). If any current CVRSS codes are set, go to applicable code for diagnosis. See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table. If no current CVRSS codes are set, go to next step.
  5. If any history CVRSS codes are set, problem is intermittent. See «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) . If no history CVRSS codes are set, problem is not electrical. Check for a mechanical or hydraulic problem, or for air in system.
  6. Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear CVRSS codes. Road test vehicle driving faster than 50 MPH for 20 seconds and avoiding smooth road surfaces. After road test, using scan tool, cycle all CVRSS outputs. Wait 90 seconds. Using Instrument Panel Cluster (IPC) on-board diagnostics, display and record all CVRSS codes and their status (current or history). If any current CVRSS codes are set, go to applicable code for diagnosis. See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table. If no current CVRSS codes are set, system is okay.

NO RSS DATA, LOSS OF SERIAL COMMUNICATION OR POWER

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Check 10-amp RSS fuse (ignition fuse) in trunk compartment fuse block. If fuse is blown, go to step 12 . If fuse is okay, go to next step.
  3. Check 10-amp RSS fuse (battery fuse) in trunk compartment fuse block. If fuse is blown, go to step 13 . If fuse is okay, go to next step.
  4. Check for open in CVRSS control module ground circuit (Black wire). Repair as necessary. After repairs, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . If circuit is okay, go to next step.
  5. Install fuses if removed. Turn ignition on, with engine off. Using DVOM, backprobe measuring voltage between battery positive voltage circuit (Orange wire) of CVRSS control module connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 7 . If voltage is less than 10 volts, go to next step.
  6. Repair open in battery positive voltage circuit (Orange wire).
  7. Using DVOM, measure voltage between ignition positive voltage circuit (Light Green wire) of CVRSS control module connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 9 . If voltage is less than 10 volts, go to next step.
  8. Repair open in ignition positive voltage circuit (Light Green wire). After repairs, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) .
  9. Check for open, short to ground or short to voltage in class 2 serial data line circuit (Purple wire). Repair as necessary. If circuit is okay, go to next step.
  10. Check for open, short to ground or short to voltage in other class 2 serial data line circuit (Purple wire). Repair as necessary. After repairs, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . If circuit is okay, go to next step.
  11. If Code P1611 is set, go to step 16 . If Code P1611 is not set, go to appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT for diagnosis.
  12. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Check continuity between ignition positive voltage circuit (Light Green wire) of CVRSS control module harness connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. After repairs, go to step 15 . If circuit is okay, go to step 14 .
  13. Turn ignition off. Check continuity between battery positive voltage circuit (Orange wire) of CVRSS control module harness connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. After repairs, go to step 15 . If circuit is okay, go to next step.
  14. Check for intermittent short to ground in affected circuit. After repairs, go to step 16 .
  15. Replace affected fuse. After repairs, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) .
  16. Check all electrical connections of affected circuit for proper seating and crimps. Reinstall/reconnect all components and connectors. Turn ignition on, with engine off. Clear codes. Display CVRSS codes. If IPC displays NO RSS DATA, go to next step. If IPC does not display NO RSS DATA, see NOTES ON INTERMITTENTS under DIAGNOSIS & TESTING.
  17. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components and connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS. Perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) .

Using Self-Diagnostics

Note. Checking system in self-diagnostics mode for more than 30 minutes with engine not running will discharge battery, possibly resulting in false diagnostic information being related or causing a no-start condition. If necessary, connect battery charger (turn ignition off before connecting).

Note. To exit diagnostics at any time, press RESET button on A/C-heater control panel, or turn ignition off.

Entering Diagnostics

Turn ignition on. Simultaneously push OFF and WARMER buttons on A/C-heater control panel.

Segment Check

A segment check of all LEDs on the Instrument Panel Cluster (IPC) should begin. During this check, all segments except the turn signal indicators should illuminate. If all segments do not illuminate, repair or replace IPC. After segment check, diagnostic code display will automatically begin. (Scheme 14)

Diagnostic Code Display

  1. System will begin displaying codes (if any are stored). See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table. The first character of code is a letter that indicates which system code applies to.
  2. The fifth character of code is the letter "C" or "H". "C" stands for current code. Current means the fault currently exists (like a hard code), and fault was present the last time the diagnostic test was run. "H" stands for history code. History means fault does not currently exist, but existed before (like an intermittent code), and was not present the last time the diagnostic test was run.
  3. If no codes are present for road-sensing suspension system, a NO RSS CODES message will be displayed. If the communication line for road-sensing suspension system is not operating, a NO RSS DATA message will be displayed, indicating that the IPC could not communicate with system.
CodeDescription
C1326Battery Out of Range Fault
C1650CVRSS Control Module Fault
C1658CVRSS Control Module Calibration Fault
C1710Left Front Damper Actuator Short Circuit To Battery/Short Across Load
C1711Left Front Damper Actuator Short Circuit To Ground
C1712Left Front Damper Actuator Open Circuit
C1715Right Front Damper Actuator Short Circuit To Battery/Short Across Load
C1716Right Front Damper Actuator Short Circuit To Ground
C1717Right Front Damper Actuator Open Circuit
C1720Left Rear Damper Actuator Short Circuit To Battery/Short Across Load
C1721Left Rear Damper Actuator Short Circuit To Ground
C1722Left Rear Damper Actuator Open Circuit
C1725Right Rear Damper Actuator Short Circuit To Battery/Short Across Load
C1726Right Rear Damper Actuator Short Circuit To Ground
C1727Right Rear Damper Actuator Open Circuit
C1735ELC Compressor Relay Short Circuit To Battery/Short Across Load
C1736ELC Compressor Relay Short To Ground Or Open Circuit
C1737ELC Exhaust Solenoid Valve Short To Battery/Short Across Load
C1738ELC Exhaust Solenoid Valve Short To Ground Or Open Circuit
C1743Speed Signal Fault
C1744Lift/Dive Signal Fault
C1760Left Front Position Sensor Input Fault
C1761Right Front Position Sensor Input Fault
C1762Left Rear Position Sensor Input Fault
C1763Right Rear Position Sensor Input Fault
C1768Position Sensor Supply Fault
C1780Steering Sensor Input Fault
C1782ICCS2 Datalink Left Output Short Circuit To Battery
C1783ICCS2 Datalink Left Output Short Circuit To Ground/Open Circuit
C1784ICCS2 Datalink Right Output Short Circuit To Battery
C1785ICCS2 Datalink Right Output Short Circuit To Ground/Open Circuit
C1786RTD BODY Relay Fault
C1787RTD BODY Relay Short To Ground/Open Circuit
C1788RTD BODY Relay Short To Battery/Short Across Load

CODE DESCRIPTION

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13

Select System Mode

After trouble codes have been displayed, PCM? will be displayed. (At this point, to return to diagnostic code display, press OFF button, otherwise, continue procedure.) Cycle through systems by pressing LO button until desired system is displayed, and then press HI button. (Scheme 14)

Select Test Type Mode

RSS DATA will be displayed. (At this point, to return to SELECT SYSTEM MODE, press OFF button, otherwise, continue procedure.) Press LO button to cycle through tests until desired test is displayed. To enter desired test, press HI button. (Scheme 14)

Select Test Mode

Press HI button to advance to next test or LO button to return to previous test. (At this point, to return to SELECT TEST TYPE MODE, press OFF button, otherwise, continue procedure.) (Scheme 15) A description of available tests follows.

  1. RSS Data - Actual analog values (as seen/used by the system) are displayed.
  2. RSS Inputs - Displays state of lift/dive signal. HI state indicates PCM is not grounding the signal circuit (vehicle is NOT lifting or diving). LO signal indicates PCM is grounding the signal circuit (vehicle is lifting or diving).
  3. RSS Outputs (Output Cycling) - Output cycling can be used to determine if the output tests can be actuated regardless of the inputs and normal program instructions. After selecting an output test, HI and LO will be displayed for 3 seconds in each state to indicate command and output terminal voltage.
  4. RSS Clear Codes - To clear codes, press HI button. RSS CODES CLEAR message will be displayed for 3 seconds, and then system will automatically return to SELECT TEST TYPE MODE.

Exiting Diagnostics

Press RESET button on A/C-heater control panel, or turn ignition off. This will NOT cause codes to be erased.

Scheme 14

Scheme 14: Exiting Diagnostics
Scheme 14: Exiting Diagnostics

Scheme 15

Scheme 15
Scheme 15

NOTES ON INTERMITTENTS

Because CVRSS control module performs a test for different failures under different driving conditions, it is often necessary to test drive vehicle to cause the failure to occur again and allow a code to set. If failure does not occur again during test drive, a good description of vehicle behavior may be helpful in determining which component or circuit is faulty.

Most intermittent problems are caused by faulty electrical connections or wiring. Check for the following conditions

  1. Poor mating of connector halves.
  2. Terminals not fully seated in connector body.
  3. Improperly formed or damaged terminals (carefully reform all connector terminals in a problem circuit to increase contact tension).
  4. Poor terminal-to-wire connection (requires removing terminal from connector body to inspect).

Most of the time, if CVRSS system detects a fault but the fault clears before the ignition is turned off, CVRSS function will not be disabled. Some failures will disable CVRSS function for the entire ignition cycle, even if the fault clears before the ignition is turned off.

When a fault occurs, SERVICE RIDE CONTROL message should come on and remain on until the ignition is turned off and then on again. The following conditions may cause SERVICE RIDE CONTROL message to be displayed intermittently

  1. An interruption of power to CVRSS control module (check wiring and fuses).
  2. Incorrect voltage of power supply circuits (battery or ignition) to CVRSS control module. Voltage must be more than 10 volts or less than 16.0 volts. This condition prevents CVRSS control module from logging codes and displaying SERVICE RIDE CONTROL message. If this condition occurs while driving, system will not operate normally. When normal voltage is restored, system will operate normally (check charging system).

DIAGNOSTIC TESTS

Note. For terminal and circuit identification, see WIRING DIAGRAMS. Use illustrations for identification of CVRSS control module connector terminals. (Scheme 12)and (Scheme 13). After completing each repair, recheck system operation to verify problem has been fixed. See CVRSS SYSTEM CHECK under DIAGNOSIS & TESTING.

CODE C1650: CVRSS CONTROL MODULE FAULT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) under DIAGNOSIS & TESTING. After performing CVRSS system check, go to next step.
  2. If Code C1650 is displayed as current, go to step 5 . If Code C1650 is not displayed as current, go to next step.
  3. Clear codes. Wait 30 seconds, and then display CVRSS codes. If Code C1650 is set, go to step 5 . If Code C1650 is not set, go to next step.
  4. If vehicle has been previously serviced for Code C1650, go to next step. If vehicle has not been previously serviced for Code C1650, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) .
  5. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1658: CVRSS CONTROL MODULE CALIBRATION FAULT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) under DIAGNOSIS & TESTING. After performing CVRSS system check, go to next step.
  2. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS. Clear codes. Wait 30 seconds, and then display CVRSS codes. If Code C1658 is set, go to next step. If Code C1658 is not set, see NOTES ON INTERMITTENTS under DIAGNOSIS & TESTING.
  3. Calibrate NEW CVRSS control module. See CALIBRATING CVRSS CONTROL MODULE under ADJUSTMENTS. Clear codes. Wait 30 seconds, and then display CVRSS codes. If Code C1658 is set, go to next step. If Code C1658 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  4. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1710, C1715, C1720 & C1725: DAMPER ACTUATOR SHORT CIRCUIT TO BATTERY/SHORT ACROSS LOAD

  1. CODE C1710: Left Front Damper Actuator Short Circuit To Battery/Short Across Load
  2. CODE C1715: Right Front Damper Actuator Short Circuit To Battery/Short Across Load
  3. CODE C1720: Left Rear Damper Actuator Short Circuit To Battery/Short Across Load
  4. CODE C1725: Right Rear Damper Actuator Short Circuit To Battery/Short Across Load
  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Disconnect damper actuator connector. Using DVOM, measure resistance between terminals of damper actuator connector (component side). If resistance is 9.5-15.5 ohms, go to next step. If resistance is not 9.5-15.5 ohms, go to step 7 .
  3. Turn ignition on, with engine off. Using DVOM, measure voltage at damper ground circuit (LF=LT GRN, RF=BRN, LR=RED/BLK, RR=PPL) of damper actuator connector (component side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is 10 volts, go to step 7 . If voltage is not 10 volts, go to next step.
  4. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Turn ignition on, with engine off. Using DVOM, measure voltage at damper control circuit (LF=RED, RF=WHT/BLK, LR=RED, RR=YEL) of CVRSS control module harness connector C1. If voltage is 10 volts, go to step 8 . If voltage is not 10 volts, go to next step.
  5. Check continuity between damper control circuit (LF=RED, RF=WHT/BLK, LR=RED, RR=YEL) and damper ground circuit (LF=LT GRN, RF=BRN, LR=RED/BLK, RR=PPL) of CVRSS control module harness connector C1. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. If circuits are okay, go to next step.
  6. Check for intermittents in damper actuator circuits. Turn ignition off. Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear codes, and then wait 90 seconds. Display codes. If Code C1710, C1715, C1720 or C1725 is set, go to step 9 . If Code C1710, C1715, C1720 or C1725 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  7. Replace damper actuator.
  8. Repair short to voltage in damper control circuit (LF=RED, RF=WHT/BLK, LR=RED, RR=YEL).
  9. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1711, C1716, C1721 & C1726: DAMPER ACTUATOR SHORT CIRCUIT TO GROUND

  1. CODE C1711: Left Front Damper Actuator Short Circuit To Ground
  2. CODE C1716: Right Front Damper Actuator Short Circuit To Ground
  3. CODE C1721: Left Rear Damper Actuator Short Circuit To Ground
  4. CODE C1726: Right Rear Damper Actuator Short Circuit To Ground
  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. If Code C1786, C1787 or C1788 is set, go to applicable code for diagnosis. See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table under SELF-DIAGNOSTICS under DIAGNOSIS & TESTING. If Code C1786, C1787 or C1788 is not set, go to next step.
  3. Turn ignition off. Disconnect damper actuator connector. Using DVOM, measure resistance between terminals of damper actuator connector (component side). If resistance is 9.5-15.5 ohms, go to next step. If resistance is not 9.5-15.5 ohms, go to step 7 .
  4. Check continuity between damper control circuit (LF=RED, RF=WHT/BLK, LR=RED, RR=YEL) of damper actuator connector (component side) and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If continuity exists, go to step 7 . If continuity does not exist, go to next step.
  5. Disconnect 32-pin CVRSS control module connector C1. Check continuity between damper control circuit (LF=RED, RF=WHT/BLK, LR=RED, RR=YEL) of CVRSS control module harness connector C1 and ground. Repair as necessary. If circuit is okay, go to next step.
  6. Check for intermittent shorts or chafed wires. Turn ignition off. Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear codes, and then wait 90 seconds. Display codes. If Code C1711, C1716, C1721 or C1726 is set, go to step 8 . If Code C1711, C1716, C1721 or C1726 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  7. Replace damper actuator.
  8. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1712, C1717, C1722 & C1727: DAMPER ACTUATOR OPEN CIRCUIT

  1. CODE C1712: Left Front Damper Actuator Open Circuit
  2. CODE C1717: Right Front Damper Actuator Open Circuit
  3. CODE C1722: Left Rear Damper Actuator Open Circuit
  4. CODE C1727: Right Rear Damper Actuator Open Circuit
  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Disconnect damper actuator connector. Using DVOM, measure resistance between terminals of damper actuator connector (component side). If resistance is 9.5-15.5 ohms, go to next step. If resistance is not 9.5-15.5 ohms, go to step 6 .
  3. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Check for open in damper ground circuit (LF=LT GRN, RF=BRN, LR=RED/BLK, RR=PPL). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. If circuit is okay, go to next step.
  4. Check for open in damper control circuit (LF=RED, RF=WHT/BLK, LR=RED, RR=YEL). Repair as necessary. If circuit is okay, go to next step.
  5. Check CVRSS control module connector and damper actuator connector for debris and corrosion. Check for intermittent poor electrical connections. Turn ignition off. Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear codes, and then wait 90 seconds. Display codes. If Code C1712, C1717, C1722 or C1727 is set, go to step 7 . If Code C1712, C1717, C1722 or C1727 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  6. Replace damper actuator.
  7. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1735: ELC COMPRESSOR RELAY SHORT CIRCUIT TO BATTERY/SHORT ACROSS LOAD

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Remove ELC compressor relay. Using DVOM, measure resistance between coil terminals of ELC compressor relay (component side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If resistance is 45-49 ohms, go to next step. If resistance is not 45-49 ohms, go to step 7 .
  3. Turn ignition on, with engine off. Using DVOM, measure voltage at ELC compressor relay output circuit (Yellow wire) of ELC compressor relay connector (socket of trunk compartment relay center). See WIRING DIAGRAMS. If voltage is more than 10 volts, go to step 5 . If voltage is less than 10 volts, go to next step.
  4. Check CVRSS control module connector and ELC compressor relay and connector (socket) for debris and corrosion. Install ELC compressor relay. Reinstall/reconnect all components/connectors. Clear codes, and then wait 60 seconds. Display codes. If Code C1735 is set, go to step 8 . If Code C1735 is not set, go to step 6 .
  5. Repair short to voltage in ELC compressor relay output circuit (Yellow wire).
  6. Check for intermittent short to voltage in ELC compressor relay output circuit (Yellow wire).
  7. Replace ELC compressor relay.
  8. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1736: ELC COMPRESSOR RELAY SHORT TO GROUND OR OPEN CIRCUIT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Check 10-amp IGN-0 BODY fuse in trunk compartment fuse block. If fuse is blown, go to step 7 . If fuse is okay, go to next step.
  3. Disconnect 32-pin CVRSS control module connector C1. Turn ignition on, with engine off. Using DVOM, measure voltage at ELC compressor relay output circuit (Yellow wire) of CVRSS control module harness connector. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 8 . If voltage is less than 10 volts, go to next step.
  4. Turn ignition off. Check for open or short to ground in ELC compressor relay output circuit (Yellow wire). Repair as necessary. If circuit is okay, go to next step.
  5. Using DVOM, measure resistance between coil terminals of ELC compressor relay (component side). If resistance is 45-49 ohms, go to next step. If resistance is not 45-49 ohms, go to step 10 .
  6. Check for open in IGN-0 BODY fuse circuit (Light Green wire). Repair as necessary. If circuit is okay, go to step 8 .
  7. Check continuity between IGN-0 BODY fuse circuit (Light Green wire) of ELC compressor relay connector (socket of trunk compartment relay center) and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. After repairs, go to step 9 . If circuit is okay, go to next step.
  8. Check ELC compressor relay and connector (socket) for debris, corrosion, and/or intermittent opens. Check for intermittent short to ground in ELC compressor relay output circuit (Yellow wire). Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear CVRSS codes. Wait 60 seconds. Display CVRSS codes. If Code C1736 is set, go to step 11 . If Code C1736 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  9. Replace 10-amp IGN-0 BODY fuse.
  10. Replace ELC compressor relay.
  11. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1737: ELC EXHAUST SOLENOID VALVE SHORT TO BATTERY/SHORT ACROSS LOAD

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Disconnect ELC compressor assembly connector. Using DVOM, measure resistance between exhaust solenoid output circuit (White wire) and exhaust solenoid input circuit (RED wire) of ELC compressor assembly connector (component side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If resistance is 25-35 ohms, go to next step. If resistance is not 25-35 ohms, go to step 7 .
  3. Disconnect 32-pin CVRSS control module connector C1. Turn ignition on, with engine off. Using DVOM, measure resistance between exhaust solenoid output circuit (White wire, TERM C-14) of CVRSS control module harness connector ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 5 . If voltage is less than 10 volts, go to next step.
  4. Check CVRSS control module connector and ELC compressor assembly connector for debris and corrosion. Reinstall/reconnect all components/connectors. Clear CVRSS codes. Wait 60 seconds. Display CVRSS codes. If Code C1737 is set as current, go to step 8 . If Code C1737 is not set as current, go to step 6 .
  5. Repair short to voltage in exhaust solenoid output circuit (White wire).
  6. Check for intermittent short to voltage in exhaust solenoid output circuit (White wire). Repair as necessary.
  7. Replace ELC compressor assembly and all related air lines.
  8. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1738: ELC EXHAUST SOLENOID VALVE SHORT TO GROUND OR OPEN CIRCUIT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Check output voltage of 30-amp ELC MAXI fuse in trunk compartment. Maxifuse is hot at all times. If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 7 .
  3. Disconnect ELC compressor assembly connector. Using DVOM, measure voltage between exhaust solenoid input circuit (RED wire) of ELC compressor assembly harness connector and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 12 .
  4. Using DVOM, measure resistance between exhaust solenoid output circuit (White wire) and exhaust solenoid input circuit (RED wire) of ELC compressor assembly connector (component side). If resistance is 25-35 ohms, go to next step. If resistance is not 25-35 ohms, go to step 13 .
  5. Disconnect 32-pin CVRSS control module connector C1. Check continuity between exhaust solenoid output circuit (White wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. After repairs, go to step 14 . If circuit is okay, go to next step.
  6. Check for open or poor connection in exhaust solenoid output circuit (White wire). Repair as necessary. If circuit is okay, go to step 10 .
  7. Turn ignition off. Disconnect ELC compressor assembly connector. Using DVOM, measure resistance between exhaust solenoid output circuit (White wire) and exhaust solenoid input circuit (RED wire) of ELC compressor assembly connector (component side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If resistance is 25-35 ohms, go to next step. If resistance is not 25-35 ohms, go to step 13 .
  8. Check continuity between exhaust solenoid input circuit (RED wire) of ELC compressor assembly harness connector and ground. See WIRING DIAGRAMS. Also, check continuity between ELC compressor motor power supply circuit (Dark Green wire) of ELC compressor assembly harness connector. Repair as necessary. After repairs, go to step 14 . If circuits are okay, go to next step.
  9. Using DVOM, measure resistance between specified circuits of ELC compressor assembly connector (component side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Compressor motor power supply circuit (Dark Green wire) and ground. Compressor motor power supply circuit (Dark Green wire) and compressor motor ground circuit (Black wire). Exhaust solenoid input circuit (Red wire) and ground. Exhaust solenoid input circuit (Red wire) and compressor motor ground circuit (Black wire). If resistance is less than 5 ohms, go to step 13 . If resistance is more than 5 ohms, go to step 11 .
  10. Check exhaust solenoid output circuit (White wire), exhaust solenoid input circuit (Red wire), and 30-amp ELC MAXI fuse power supply circuit (Red wire) for debris, corrosion and/or intermittent opens. Check for intermittent short to ground in exhaust solenoid output circuit (White wire). Reinstall/reconnect all components/connectors. Clear codes, and then wait 60 seconds. Display codes. If Code C1738 is set, go to step 15 . If Code C1738 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  11. Check for intermittent short to ground in compressor motor power supply circuit (Dark Green wire), exhaust solenoid input circuit (Red wire) and within ELC compressor assembly pigtail. Repair as necessary. After repairs, go to step 14 .
  12. Repair open in exhaust solenoid input circuit (Red wire).
  13. Replace ELC compressor assembly and all related air lines. After repairs, go to next step.
  14. Check 30-amp ELC MAXI fuse in trunk compartment for proper operation. Repair as necessary.
  15. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1743: SPEED SIGNAL FAULT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. If Code P1642 is set, go to Code P1642 for diagnosis. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If Code P1642 is not set, go to next step.
  3. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Disconnect 23-pin splice C205 connector located behind right side of instrument panel, near kick panel. Check continuity between vehicle speed input circuit (Dark Green/White wire) of splice C205 connector (PCM side) and CVRSS control module harness connector C1. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If continuity exists, go to next step. If continuity does not exist, go to step 6 .
  4. Check for intermittent open in vehicle speed input circuit (Dark Green/White wire). If circuit is okay, go to next step.
  5. Reinstall/reconnect all components/connectors. Turn ignition on. Clear codes. Drive vehicle faster than 20 MPH for more than 10 seconds. Display codes. If Code C1743 is set, go to step 7 . If Code C1743 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  6. Repair open in vehicle speed input circuit (Dark Green/White wire).
  7. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1744: LIFT/DIVE SIGNAL FAULT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. If Code P1642 is set, go to Code P1642 for diagnosis. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If Code P1642 is not set, go to next step.
  3. Turn ignition on. Using DVOM, backprobe measuring voltage between lift/dive signal input circuit (Purple wire) of CVRSS control module connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to step 8 .
  4. Install scan tool. Continue backprobing lift/dive signal input circuit (Purple wire) of CVRSS control module connector C1. Using scan tool, select MISC TESTS, and then MORE. Select RIDE CONTROL and command ride control to FIRM. Within 5 seconds, measure voltage between lift/dive signal input circuit (Purple wire) of CVRSS control module connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is less than one volt, go to step 7 . If voltage is more than one volt, go to next step.
  5. Store fluid life. Turn ignition off. Wait 30 seconds. Disconnect Powertrain Control Module (PCM) connector C1. Check for proper seating of lift/dive signal output circuit (Purple wire) at PCM connector. Disconnect 32-pin CVRSS control module connector C1. Check for open in lift/dive signal circuit (Purple wire). Repair as necessary. After repairs, go to next step. If circuit is okay, replace PCM.
  6. Repair open in lift/dive signal circuit (Purple wire). Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear all CVRSS codes.
  7. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.
  8. Store fluid life. Turn ignition off. Wait 30 seconds. Disconnect Powertrain Control Module (PCM) connector C1. Disconnect 32-pin CVRSS control module connector C1. Check for proper seating of lift/dive signal input circuit (Purple wire) at CVRSS control module connector. Check continuity between lift/dive signal input circuit (Purple wire) of CVRSS control module harness connector C1 to ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If a short to ground is present in circuit, go to next step. If a short to ground is not present in circuit, go to step 10 .
  9. Repair short to ground in lift/dive signal circuit (Purple wire). Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear CVRSS and PCM codes.
  10. Turn ignition on, with engine off. Using DVOM, measure voltage on lift/dive signal circuit (Purple wire). If voltage is less than 6 volts, go to step 7 . If voltage is more than 6 volts, go to next step.
  11. Repair short to voltage in lift/dive signal circuit (Purple wire). Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear CVRSS and PCM codes.

CODE C1760, C1761, C1762 & C1763: POSITION SENSOR INPUT FAULT

  1. CODE C1760: Left Front Position Sensor Input Fault
  2. CODE C1761: Right Front Position Sensor Input Fault
  3. CODE C1762: Left Rear Position Sensor Input Fault
  4. CODE C1763: Right Rear Position Sensor Input Fault
  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. If Code C1768 is set, go to applicable code for diagnosis. See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table under SELF-DIAGNOSTICS. If Code C1768 is not set, go to next step.
  3. Check for mechanical problems at position sensor (i.e. disconnected sensor link). Repair as necessary. If no mechanical problems are present, go to next step.
  4. Using DVOM, backprobe measuring voltage between position sensor input circuit (Tan/White wire on front; Light Green/White wire on rear) and sensor ground circuit (Light Blue/Black on front, Light green/Black on rear) of CVRSS control module connector C2. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is less than .5 volt, go to next step. If voltage is more than .5 volt, go to step 7 .
  5. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Check CVRSS control module connector C2 for proper seating of circuits and for debris or corrosion. Disconnect position sensor connector. Check position sensor connector for proper seating of circuits and for debris or corrosion. Check for open in sensor 8-volt reference circuit (Purple/White on front, Red/Black on rear) and in position sensor input circuit (Tan/White wire on front; Light Green/Whit wire on rear). Repair as necessary. If circuits and connections are okay, go to next step.
  6. Check continuity between position sensor input circuit (Tan/White wire on front; Light Green/White wire on rear) and sensor ground circuit (Black wire). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Also, check continuity between position sensor input circuit (Tan/White wire on front; Light Green/White wire on rear) and ground. Repair as necessary. If circuits are okay, go to step 12 .
  7. If voltage is more than 4.5 volts, go to next step. If voltage is less than 4.5 volts, go to step 14 .
  8. If voltage is more than 10 volts, go to step 13 . If voltage is less than 10 volts, go to next step.
  9. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Disconnect position sensor connector. Check continuity between sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and position sensor input circuit (Tan/White wire on front; Light Green/White wire on rear). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. If circuit is okay, go to next step.
  10. Check for open in sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear). Repair as necessary. If circuit is okay, go to next step.
  11. Reconnect CVRSS control module connector. Backprobe checking continuity between sensor ground circuit (Light Blue on front; Light Green/Black on rear) of CVRSS control module connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If continuity exists, go to next step. If continuity does not exist, go to step 14 .
  12. Replace position sensor. After repairs, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) .
  13. Repair short to voltage in position sensor input circuit (Tan/White wire on front; Light Green/White wire on rear).
  14. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1768: POSITION SENSOR SUPPLY FAULT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition on, with engine off. Using DVOM, backprobe measuring voltage at left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module connector C2. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is less than 6 volts, go to step 4 . If voltage is more than 6 volts, go to next step.
  3. If voltage is more than 9 volts, go to step 12 . If voltage is less than 9 volts, go to step 20 .
  4. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Check continuity between left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. Repair as necessary. If circuit is okay, go to next step.
  5. Check continuity between right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. If circuit is okay, go to next step.
  6. Check continuity between left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. Repair as necessary. If circuit is okay, go to next step.
  7. Check continuity between right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. Repair as necessary. If circuit is okay, go to next step.
  8. Check continuity between left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and left rear position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. If circuit is okay, go to next step.
  9. Check continuity between right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and right rear position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. Repair as necessary. If circuit is okay, go to next step.
  10. Check continuity between left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and left front position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. Repair as necessary. If circuit is okay, go to next step.
  11. Check continuity between right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) and right front position sensor ground circuit (Light Blue/Black on front; Light Green/Black on rear) of CVRSS control module harness connector C2. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Repair as necessary. If circuit is okay, go to next step.
  12. Turn ignition off. Disconnect 24-pin CVRSS control module connector C2. Turn ignition on, with engine off. Using DVOM, measure voltage between left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. If voltage is more than 10 volts, go to step 16 . If voltage is less than 10 volts, go to step 20 .
  13. Using DVOM, measure voltage between right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. If voltage is more than 10 volts, go to step 17 . If voltage is less than 10 volts, go to next step.
  14. Using DVOM, measure voltage between left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 18 . If voltage is less than 10 volts, go to next step.
  15. Using DVOM, measure voltage between right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear) of CVRSS control module harness connector C2 and ground. If voltage is more than 10 volts, go to step 19 . If voltage is less than 10 volts, go to step 20 .
  16. Repair short to voltage in left rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  17. Repair short to voltage in right rear position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  18. Repair short to voltage in left front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  19. Repair short to voltage in right front position sensor 8-volt reference circuit (Purple/White on front; Red/Black on rear). Repair as necessary.
  20. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

Scheme 16

Scheme 16: CODE C1780: STEERING SENSOR INPUT FAULT
Scheme 16: CODE C1780: STEERING SENSOR INPUT FAULT
  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check). After performing CVRSS system check, go to next step.
  2. If Code C1781 is set, go to applicable code for diagnosis. See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table under SELF-DIAGNOSTICS under DIAGNOSIS & TESTING. If Code C1781 is not set, go to next step.
  3. Turn ignition on, with engine. Center steering wheel and verify front wheels are straight. Using scan tool, monitor RSS DATA RS D15. If voltage is 2-3 volts, go to step 14. If voltage is less than 2 volts or more than 3 volts, go to next step.
  4. Turn ignition off. Center steering wheel and verify front wheels are straight. Disconnect steering sensor connector. Using DVOM, measure resistance between 5-volt reference circuit (Gray wire) and ground circuit (Orange/Black wire) of steering sensor connector (component side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing). If resistance is 8000-12,000 ohms, go to next step. If resistance is less than 8000 or more than 12,000 ohms, go to step 17.
  5. Using DVOM, measure resistance between steering signal circuit (Light Blue wire) and ground circuit (Orange/Black wire) of steering sensor connector (component side). If resistance is 4000-6000 ohms, go to next step. If resistance is less than 4000 or more than 6000 ohms, go to step 17.
  6. Check for steering sensor misalignment. If steering sensor is misaligned, go to step 15. If steering sensor is not misaligned, go to next step.
  7. Disconnect 24-pin CVRSS control module connector C2. Check continuity between the following circuits of CVRSS control module harness connector C2 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing). 5-volt reference circuit (Gray wire). Steering signal circuit (Light Blue wire). Ground circuit (Orange/Black wire). If continuity does not exist on all circuits, go to next step. If continuity exists on any circuit, go to step 11.
  8. Check for opens in 5-volt reference circuit (Gray wire), steering signal circuit (Light Blue wire), and ground circuit (Orange/Black wire). If open is present on any circuit, go to step 10. If all circuits are okay, go to next step.
  9. Turn ignition on, with engine off. Check for short to voltage in 5-volt reference circuit (Gray wire), steering signal circuit (Light Blue wire), and ground circuit (Orange/Black wire). If voltage is present on any circuit, go to step 12. If voltage is not present on any circuit, go to step 13.
  10. Repair open in affected circuit.
  11. Repair short to ground in affected circuit.
  12. Repair short to voltage in affected circuit.
  13. Turn ignition off. Reinstall/reconnect all components/connectors. Clear codes. Drive vehicle faster than 50 MPH for more than 15 seconds. Display CVRSS codes. If Code C1780 is set, go to step 18. If Code C1780 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  14. Using scan tool, monitor RSS DATA RS D15 while rotating steering wheel. (Scheme 16) If steering sensor output voltage is as specified, go to step 16. If steering sensor output voltage is not as specified, go to step 18.
  15. Realign steering sensor. See «STEERING AUTOCENTER»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__steering-autocenter) under ADJUSTMENTS.
  16. Check for intermittent short to ground, short to voltage or open in 5-volt reference circuit (Gray wire), steering signal circuit (Light Blue wire), and ground circuit (Orange/Black wire). Repair as necessary.
  17. Turn ignition off. Replace steering sensor. Perform steering autocenter adjustment. See «STEERING AUTOCENTER»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__steering-autocenter) under ADJUSTMENTS.
  18. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1782: ICCS2 DATALINK LEFT OUTPUT SHORT CIRCUIT TO BATTERY

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Disconnect Electronic Brake Traction Control Module (EBTCM) connector C2. Turn ignition on, with engine off. Using DVOM, measure voltage between ICCS2 data link output left circuit (White wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 4 .
  3. Repair short to voltage in ICCS2 data link output left circuit (White wire).
  4. Reconnect CVRSS control module connector C1. Clear CVRSS codes. Wait 90 seconds. Display CVRSS codes. If Code C1782 is set, go to next step. If Code C1782 is not set, go to step 6 .
  5. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.
  6. Turn ignition off. Replace EBTCM.

CODE C1783: ICCS2 DATALINK LEFT OUTPUT SHORT CIRCUIT TO GROUND/OPEN CIRCUIT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Turn ignition on, with engine off. Using DVOM, measure voltage between ICCS2 data link output left circuit (White wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 8 . If voltage is less than 10 volts, go to next step.
  3. Check continuity between ICCS2 data link output left circuit (White wire) of CVRSS control module harness connector C1 and ground. If a short to ground is present, go to step 5 . If a short to ground is not present, go to next step.
  4. Disconnect Electronic Brake Traction Control Module (EBTCM) connector C2. Check continuity between ICCS2 data link output left circuit (White wire) of CVRSS control module harness connector C1 and ICCS2 data link input left circuit (Brown wire) of EBTCM harness connector C2. If continuity exists, go to step 10 . If continuity does not exist, go to step 6 .
  5. Disconnect Electronic Brake Traction Control Module (EBTCM) connector C2. Check continuity between ICCS2 data link output left circuit (White wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If continuity exists, go to step 7 . If continuity does not exist, go to step 10 .
  6. Repair open in ICCS2 data link output left circuit (White wire) or ICCS2 data link input left circuit (Brown wire).
  7. Repair short to ground in ICCS2 data link output left circuit (White wire).
  8. Check appropriate terminal/connection for corrosion or improper seating. Repair as necessary. If terminal/connection is okay, go to next step.
  9. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.
  10. Turn ignition off. Replace EBTCM.

CODE C1784: ICCS2 DATALINK RIGHT OUTPUT SHORT CIRCUIT TO BATTERY

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Disconnect Electronic Brake Traction Control Module (EBTCM) connector C2. Turn ignition on, with engine off. Using DVOM, measure voltage between ICCS2 data link output right circuit (Gray wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 4 .
  3. Repair short to voltage in ICCS2 data link output right circuit (Gray wire).
  4. Reconnect CVRSS control module connector C1. Clear CVRSS codes. Wait 90 seconds. Display CVRSS codes. If Code C1784 is set, go to next step. If Code C1784 is not set, go to step 6 .
  5. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.
  6. Turn ignition off. Replace EBTCM.

CODE C1785: ICCS2 DATALINK RIGHT OUTPUT SHORT CIRCUIT TO GROUND/OPEN CIRCUIT

  1. Perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Turn ignition on, with engine off. Using DVOM, measure voltage between ICCS2 data link output right circuit (Gray wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 8 . If voltage is less than 10 volts, go to next step.
  3. Check continuity between ICCS2 data link output right circuit (Gray wire) of CVRSS control module harness connector C1 and ground. If a short to ground is present, go to step 5 . If a short to ground is not present, go to next step.
  4. Disconnect Electronic Brake Traction Control Module (EBTCM) connector C2. Check continuity between ICCS2 data link output right circuit (Gray wire) of CVRSS control module harness connector C1 and ICCS2 data link input right circuit (Gray wire) of EBTCM harness connector C2. If continuity exists, go to step 10 . If continuity does not exist, go to step 6 .
  5. Disconnect Electronic Brake Traction Control Module (EBTCM) connector C2. Check continuity between ICCS2 data link output right circuit (Gray wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If continuity exists, go to step 7 . If continuity does not exist, go to step 10 .
  6. Repair open in ICCS2 data link output right circuit (Gray wire) or ICCS2 data link input right circuit (Gray wire). After repairs, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) .
  7. Repair short to ground in ICCS2 data link output right circuit (Gray wire).
  8. Check appropriate terminal/connection for corrosion or improper seating. Repair as necessary. If terminal/connection is okay, go to next step.
  9. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.
  10. Turn ignition off. Replace EBTCM. After repairs, perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) .

CODE C1786: RTD BODY RELAY FAULT

  1. Perform «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. If Code C1787 or C1788 is set, go to applicable code for diagnosis. See «CODE DESCRIPTION»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) table under SELF-DIAGNOSTICS under DIAGNOSIS & TESTING. If Code C1787 or C1788 is not set, go to next step.
  3. Turn ignition on, with engine off. Using DVOM, backprobe measuring voltage at RTD BODY relay output circuit (Dark Blue wire) of CVRSS control module connector C1. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 10 . If voltage is less than 10 volts, go to next step.
  4. Turn ignition off. Remove RTD BODY relay. Using DVOM, measure voltage at RTD BODY relay input circuit (Orange wire) of RTD BODY relay connector (socket of trunk compartment relay center). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 6 .
  5. Disconnect 32-pin CVRSS control module connector C1. Check continuity between RTD BODY relay output circuit (Dark Blue wire) of RTD BODY relay connector (socket of trunk compartment relay center) and CVRSS control module harness connector. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If continuity exists, go to step 8 . If continuity does not exist, go to step 7 .
  6. Repair open in RTD BODY relay input circuit (Orange wire) or check for a blown 10-amp RSS fuse (battery fuse) in trunk compartment fuse block. Repair as necessary. After repairs, go to step 9 .
  7. Repair open in RTD BODY relay output circuit (Dark Blue wire). Repair as necessary. After repairs, go to step 9 .
  8. Replace RTD BODY relay. Repair as necessary. After repairs, go to next step.
  9. Reinstall/reconnect all components/connectors.
  10. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1787: RTD BODY RELAY SHORT TO GROUND/OPEN CIRCUIT

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Remove and check 10-amp RSS fuse (battery fuse) in trunk compartment fuse block. Fuse is hot at all times. If fuse is blown, go to step 7 . If fuse is okay, go to next step.
  3. Install 10-amp RSS fuse (battery fuse). Turn ignition off. Remove RTD BODY relay. Using DVOM, measure voltage between RSS fuse coil circuit (Orange wire) of RTD BODY relay connector (socket of trunk compartment relay center) and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 10 .
  4. Remove RTD BODY relay. Using DVOM, measure resistance between coil terminals of RTD BODY relay (component side). If resistance is 50-125 ohms, go to next step. If resistance is less than 50 ohms or more than 125 ohms, go to step 12 .
  5. Disconnect 32-pin CVRSS control module connector C1. Check for open or poor connection in damper relay enable circuit (Light Blue/White wire). If open or poor connection is present, go to step 11 . If circuit and connection are okay, go to next step.
  6. Check for short to ground in damper relay enable circuit (Light Blue/White wire). See WIRING DIAGRAMS. Repair as necessary. If circuit is okay, go to step 8 .
  7. Disconnect 32-pin CVRSS control module connector C1. Check for short to ground in the following circuits. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . RTD BODY relay input circuit (Orange wire). RSS fuse coil circuit (Orange wire). RTD BODY relay output circuit (Dark Blue wire). Left front damper actuator ground circuit (Light Green wire). Right front damper actuator ground circuit (Brown wire). Left rear damper actuator ground circuit (Red/Black wire). Right rear damper actuator ground circuit (Purple wire). If a short to ground is present on any circuit, go to step 9 . If circuits are okay, go to step 13 .
  8. Check all connections on RTD BODY relay input circuit (Orange wire), RSS fuse coil circuit (Orange wire), and damper relay enable circuit (Light Blue/White wire) for debris, corrosion and/or intermittent open. Check damper relay enable circuit (Light Blue/White wire) for intermittent short to ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . Reinstall/reconnect all components/connectors. Clear codes. Display codes. If Code C1787 is set, go to step 14 . If Code C1787 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  9. Repair short to ground in affected circuit. After repairs, go to step 13 .
  10. Repair open in RSS fuse coil circuit (Orange wire).
  11. Repair open in damper relay enable circuit (Light Blue/White wire).
  12. Replace RTD BODY relay.
  13. Replace 10-amp RSS fuse (battery fuse).
  14. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

CODE C1788: RTD BODY RELAY SHORT TO BATTERY/SHORT ACROSS LOAD

  1. Perform CVRSS system check. See «CVRSS SYSTEM CHECK»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__cvrss-system-check) . After performing CVRSS system check, go to next step.
  2. Turn ignition off. Remove RTD BODY relay. Using DVOM, measure resistance between coil terminals of RTD BODY relay (component side). See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If resistance is 50-125 ohms, go to next step. If resistance is less than 50 ohms or more than 125 ohms, go to step 7 .
  3. Disconnect 32-pin CVRSS control module connector C1. Turn ignition on, with engine off. Using DVOM, measure voltage between damper relay enable circuit (Light Blue/White wire) of CVRSS control module harness connector C1 and ground. See «WIRING DIAGRAMS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing) . If voltage is more than 10 volts, go to step 6 . If voltage is less than 10 volts, go to next step.
  4. Check for intermittent short to voltage in damper relay enable circuit (Light Blue/White wire). Repair as necessary. If circuit is okay, go to next step.
  5. Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear CVRSS codes. Display CVRSS codes. If Code C1788 is set, go to step 8 . If Code C1788 is not set, see «NOTES ON INTERMITTENTS»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__notes-on-intermittents) under DIAGNOSIS & TESTING.
  6. Repair short to voltage in damper relay enable circuit (Light Blue/White wire). Reinstall/reconnect all components/connectors.
  7. Replace RTD BODY relay.
  8. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See «CALIBRATING CVRSS CONTROL MODULE»(/cadillac/deville-concours/i-final-1999-1999/remont/electronic-suspension/#suspension-electronic-cv-road-sensing__calibrating-cvrss-control-module) under ADJUSTMENTS.

Removal & Installation (Front)

Raise and support vehicle. Remove wheel. Disconnect sensor electrical connector. Remove 2 sensor harness clips. Disconnect sensor link from ball stud. Remove screws and CVRSS position sensor. To install, reverse removal procedure. Tighten screws to 89 INCH lbs. (10 N.m).

Removal & Installation (Rear)

Raise and support vehicle. Remove wheel. Disconnect sensor electrical connector. Remove 3 sensor harness clips. Disconnect sensor link from ball stud. Remove screws and CVRSS position sensor. To install, reverse removal procedure. Tighten screws to 11 ft. lbs. (15 N.m). Adjust ELC trim height. See ELC TRIM HEIGHT under ADJUSTMENTS.

Removal & Installation

Remove front trunk trim panel. Disconnect CVRSS control module electrical connectors. Remove CVRSS control module from right electronics bay. To install, reverse removal procedure. Calibrate NEW CVRSS control module. See CALIBRATING CVRSS CONTROL MODULE under ADJUSTMENTS. Adjust ELC trim height and steering autocenter. See ELC TRIM HEIGHT and STEERING AUTOCENTER under ADJUSTMENTS.

Remove steering column. See STEERING COLUMNS - CARS - ALL OTHERS article. Remove and discard lower spring retainer. Remove seal retaining bushing and steering shaft seal. Carefully pry toothed rotational dampener past shaft bolt notch. Remove bearing retainer and steering sensor assembly. To install, reverse removal procedure. Ensure steering shaft is centered. Clip steering sensor at zero detent. Align dampener slots to ribs of retainer. Push dampener until it contacts steering sensor. Install remaining components and unclip steering sensor.

SHOCK ABSORBER/STRUT ASSEMBLY

See FRONT - "E" & "K" BODIES or appropriate REAR article.

Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (DeVille Concours & Eldorado 1998). Scheme 17

Scheme 17: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (DeVille Concours & Eldorado 1998)
Scheme 17: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (DeVille Concours & Eldorado 1998)

Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (1998 Seville). Scheme 18

Scheme 18: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (1998 Seville)
Scheme 18: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (1998 Seville)

Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (DeVille & Eldorado 1999). Scheme 19

Scheme 19: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (DeVille & Eldorado 1999)
Scheme 19: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (DeVille & Eldorado 1999)

Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (1999 Seville). Scheme 20

Scheme 20: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (1999 Seville)
Scheme 20: Continuously Variable Road-Sensing Suspension (CVRSS) System Wiring Diagram (1999 Seville)

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