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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 DTC 🢒 DTC C1735 Compressor Relay Short to Battery

Circuit Description
Object Number: 305452 Size: LF

The compressor is switched ON and OFF via an ELC compressor relay which is controlled by the CVRSS module. The control module circuitry provides a switched path to ground (low-side drive) whenever compressor activity is required. This drive circuit is also continually monitored to determine if the voltage level agrees with the commanded state.

Conditions for Setting the DTC

The DTC is set when the CVRSS module sees a high voltage condition at pin C15 during a compressor ON-state.

The DTC will turn HISTORY when the CVRSS module no longer senses a high voltage condition at pin C15 while the ELC compressor relay output drive is in an ON-state.

Action Taken When the DTC Sets

The compressor relay output drive is disabled for the remainder of the ignition cycle.

Conditions for Clearing the MIL/DTC
    • Use the scan tool.
    • Refer to the CLEAR RSS CODES feature.

Diagnostic Aids

This fault condition is detectable only when the compressor relay output is commanded to the ON-state, which occurs during the Air Replenishment Cycle (ARC) and whenever an upward correction is necessary. The control module expects to see a low voltage condition during the ON-state.

Only electrical problems with the compressor relay coil circuit are flagged. The compressor motor problems and pneumatic leakage problems do not set a DTC, but the CVRSS module shuts the compressor relay off if there is no progress, or if excessive run times occur. Recovery is not attempted until the ignition is cycled OFF, then ON.

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 an internal open circuit condition in the ELC relay.

    2.

  2. This step checks for a short to voltage condition in circuit 321.

Step

Action

Value(s)

Yes

No

1

Was the Road Sensing Suspension Diagnostic System Check performed?

--

Go to Step 2

Go to Road Sensing Suspension Diagnostic System Check

2
  1. Turn the ignition OFF.

    2. Remove the ELC Relay from the Rear Junction Block.

  2. Disconnect the CVRSS module connector C1.
  3. Turn the ignition On with the engine off.
  4. Measure the voltage from CVRSS module connector C1, terminal C15, to ground with a J 39200 DMM.

Is the voltage above the specified value?

0 V

Go to Step 4

Go to Step 3

3
  1. Turn the ignition OFF.

    2. Remove the Rear Junction Block connector C3.

  2. Turn the ignition ON with the engine off.
  3. Measure the voltage from CVRSS module connector C1, terminal C15, to ground with a DMM.

Is the voltage above the specified value?

0 V

Go to Step 7

Go to Step 6

4
  1. Turn the ignition OFF.
  2. Install the ELC relay and CVRSS module connector C1.
  3. Using the scan tool special funtions, "ELC Compressor Test",command the compressor ON.

Does the ELC compressor operate when commanded ON?

--

Go to Step 5

Go to Step 8

5
  1. Check CVRSS module connector C1 and ELC relay and socket for debris and corrosion.
  2. Install the ELC relay and all of the connectors.
  3. Clear the DTCs. Refer to Clearing DTCs
  4. Wait 60 seconds.
  5. Check the RSS DTCs. Refer to Displaying Diagnostic Trouble Codes (DTC)

Is DTC C1735 current??

--

Go to Step 9

Go to Road Sensing Suspension Diagnostic System Check

6

Repair the short to voltage condition in CKT 321.

Is the repair complete?

--

Go to Road Sensing Suspension Diagnostic System Check

--

7

Replace the Rear Junction Block.

Is the replacement complete?

--

Go to Road Sensing Suspension Diagnostic System Check

--

8

Replace the ELC relay.

Is the replacement complete?

--

Go to Road Sensing Suspension Diagnostic System Check

--

9
  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

--