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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Suspension Control System - Suspension Leveling) >> Diagnostic Information and Procedures >> DTC 023 >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests for battery positive voltage at the level control compressor relay. The ELC fuse supplies power to the level control compressor relay.
  2. 4:  This step verifies that the level control compressor relay contacts are working.
  3. 5:  This step tests the ground circuit for the compressor motor.
  4. 10:  This step verifies that the level control compressor relay is replaced.
DTC 023

Step Action Yes No
Schematic Reference: Automatic Level Control Suspension Schematics 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Check all air lines and exhaust valves for air leakage.
  2. Check both rear shock absorbers for air leakage.
Did you find and correct the condition?		 Go to Step 11  Go to Step 3 
3 
  1. Turn ON the ignition.
  2. Disconnect the level control compressor relay.
  3. Probe the battery positive voltage circuit of the level control compressor relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 4  Go to Step 8 
4 
  1. Connect a test lamp between the battery positive output circuit of the level control compressor relay and the compressor motor ground circuit.
  2. With the accessory inflator switch, command the accessory inflator valve ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 6  Go to Step 5 
5  Test the ground circuit of the compressor motor for a open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
6 Inspect for poor connections at the compressor motor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
7 Inspect for poor connections at the harness connector of the level control compressor relay. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 10 
8 Repair the battery positive voltage circuit of the level control compressor relay coil. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 11  -
9 Replace the compressor motor. Refer to Air Compressor Replacement .
Did you complete the replacement?		 Go to Step 11  -
10  Replace the level control compressor relay. Refer to Automatic Level Control Relay Replacement .
Did you complete the replacement?		 Go to Step 11  -
11 Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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