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Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
DTC B0233

Step Action Value(s) Yes No
Schematic Reference:  HVAC Schematics  
Connector End View Reference:  HVAC Connector End Views  
1 Did you review the HVAC operation and perform the necessary inspections? - Go to Step 2  Go to Diagnostic System Check - HVAC Systems - Automatic 
2
  1. Observe the mode actuator drive shaft.
  2. Place the mode control in each mode position.
Does the mode actuator drive shaft rotate for each selected position?		 - Go to Step 3  Go to Step 4 
3 Inspect the mode door and the mode actuator for the following:
  • Incorrectly installed mode actuator
  • Broken or binding linkages or mode door
  • Obstruction that prevents the mode door from operating within its full range of motion

Did you find and correct the condition?		 - Go to Step 15  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
4 Test the ignition 3 voltage circuit of the mode actuator for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 5 
5 Test the ground circuit of the mode actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 6 
6 Test the 5 volt reference circuit of the mode actuator for an open, a high resistance, short to ground, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 7 
7 Test the mode door position signal circuit of the mode actuator for an open, a high resistance, short to ground, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 8 
8 Test the mode door control circuit of the mode actuator for an open, a high resistance, short to ground, or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 9 
09
IMPORTANT: The mode actuator connector and the HVAC controller connector must be connected to correctly perform the test.
  1. Turn ON the ignition, with the engine OFF.
  2. Backprobe and monitor the voltage from the mode door position signal circuit of the mode actuator to a good ground.
  3. Connect a 3 amp fused jumper wire between the mode door control circuit and the 5 volt reference circuit of the mode actuator, this drives the motor to FLR.
  4. Remove and reconnect the jumper wire between the mode door control circuit and the ground circuit of the mode actuator, this drives the motor to DEF.
Does the mode actuator drive shaft rotate and does the voltage change?		 - Go to Step 10  Go to Step 11 
10
  1. Backprobe the mode actuator connector terminal in order to measure the voltage from the mode door control circuit to a good ground.
  2. Place the mode control in each mode position.
Does the voltage measure near the specified value when airflow moves toward DEF, near the specified value when airflow moves toward FLR, and near the specified value when stationary?		 0 V toward DEF
5 V toward FLR
2.5 V stationary		 Go to Step 11  Go to Step 12 
11 Inspect for poor connections at the harness connector of the mode actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 13 
12 Inspect for poor connections at the harness connector of the HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13 Replace the mode actuator. Refer to Mode Actuator Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14 Replace the HVAC control assembly. Refer to HVAC Module Assembly Replacement .
Did you complete the replacement?		 - Go to Step 15  -
15 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
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