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Makes 🢒 Cadillac 🢒 1999 🢒 Eldorado 🢒 Suspension 🢒 Road Sensing Suspension (RSS) 🢒 DTC C1784 ICCS2 DL Right Output Short CKT to Bat

Object Number: 258352 Size: SF

Circuit Description

The CVRSS control module estimates the road surface and communicates that information to the Electronic Brake and Traction Control Module (EBTCM) using the ICCS2 Datalink Left and Right Outputs. The EBTCM uses this information to provide improved rough-road braking performance.

Conditions for Setting the DTC

The DTC is set when the CVRSS control module measures a feedback voltage greater than a preset threshold during an ICCS2 Datalink Right Output ON state.

The DTC turns HISTORY when the CVRSS control module no longer senses a high feedback voltage during five (5) consecutive ICCS2 Datalink Right Output ON states.

Action Taken When the DTC Sets
    • Both of the ICCS2 Datalink Outputs are set to default output states.
    • The SERVICE RIDE CONTROL message will be displayed.

Conditions for Clearing the MIL/DTC
    • Use the scan tool.
    • Use the On-Board diagnostic CLEAR RSS CODES feature.

Test Description

Important: 

   • Do not backprobe the sensors, actuators, or any sealed connectors.
   • When all the diagnostics and repairs are complete, clear the DTCs and verify the operation.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This step checks for a short circuit to battery condition in CKT 791.

Step

Action

Value(s)

Yes

No

1

Was the System Check performed?

--

Go to Step 2

Go to Road Sensing Suspension Diagnostic System Check

2

  1. Turn the ignition OFF.
  2. Disconnect CVRSS control module connector C1.
  3. Disconnect EBTCM connector C2.
  4. Turn the ignition ON with the engine off.
  5. Measure the voltage between pin D14 of CVRSS control module connector C1 and ground.

Is the measurement greater than the specified value?

10 V

Go to Step 3

Go to Step 4

3

Repair the short circuit to voltage condition in CKT 791.

Is the repair complete?

--

Go to Road Sensing Suspension Diagnostic System Check

--

4
  1. Connect CVRSS control module connector C1.
  2. Clear the CVRSS DTCs.
  3. Wait 90 seconds, and then check the CVRSS DTCs.

Is DTC C1784 set?

--

Go to Step 5

Go to Step 6

5
  1. Turn the ignition OFF.
  2. Replace the CVRSS control module. Refer to Electronic Suspension Control Module Replacement .
  3. Install all of the connectors and components that were removed.
  4. Install the scan tool.
  5. Turn the ignition ON with the engine off.

    6. Important: The controller must be calibrated.

  6. Calibrate the CVRSS service controller using the scan tool. Refer to Electronic Suspension Control Module Calibration .

Is the CVRSS control module calibrated?

--

Go to Road Sensing Suspension Diagnostic System Check

--

6
  1. Turn the ignition OFF.
  2. Replace the EBTCM. Refer to Electronic Brake Control Module Replacement in Antilock Brake System.

Is the replacement complete?

--

Go to Road Sensing Suspension Diagnostic System Check

--