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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1527 (HVAC Systems - Automatic) >> Diagnostic Information and Procedures >> DTC B0361, B0363, B0365, or B0367 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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:  Tests for a default setting viewed by the scan tool.
  2. 4:  Tests for the proper operation of the circuit in the high voltage range.
  3. 5:  Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
  4. 6:  Tests for a short to ground in the 5 volt reference circuit.
DTC B0361, B0363, B0365, or B0367

Step Action Values Yes No
Schematic Reference: HVAC Schematics 
Connector End View Reference: HVAC Connector End Views 
1 Did you perform the HVAC Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - HVAC Systems - Automatic 
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the appropriate Mix Mtr Position Feedback parameter in the Heating and Air Conditioning data list.
Does the scan tool indicate that the appropriate Mix Mtr Position Feedback parameter is within the specified range?		 5-250 counts Go to Step 3  Go to Step 4 
3  Place the appropriate air temperature switch from the warmest position to the coldest position.
Does the scan tool indicate that the value of the appropriate Mix Mtr Position Feedback parameter remains near the specified value?		 127 counts Go to Step 4  Go to Diagnostic Aids
4 
  1. Turn OFF the ignition.
  2. Disconnect the appropriate air temperature actuator.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the signal circuit of the air temperature actuator to a good ground.
Is the voltage more than the specified value?		 4.90 V Go to Step 5  Go to Step 9 
5 
  1. Turn OFF the ignition.
  2. Connect a 3 amp fused jumper wire between the signal circuit of the air temperature actuator and the low reference circuit of the air temperature actuator.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the jumper wire to a good ground.
Is the voltage less than the specified value?		 0.09 V Go to Step 6  Go to Step 10 
6 
  1. Turn OFF the ignition.
  2. Disconnect the fused jumper wire.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the 5 volt reference circuit at the air temperature actuator connector to a good ground.
Is the voltage more than the specified value?		 4.90 V Go to Step 8  Go to Step 7 
7 Test the 5 volt reference circuit of the air temperature actuator for a short to ground, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
8 Test the 5 volt reference circuit of the air temperature actuator for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 12 
9 Test the signal circuit of the air temperature actuator for a short to ground, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
10 Test the signal circuit of the air temperature actuator for a short to voltage, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 11 
11 Test the low reference circuit of the air temperature actuator for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
12 Inspect for poor connections at the harness connector of the air temperature 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 16  Go to Step 14 
13 Inspect for poor connections at the harness connector of the HVAC control module. 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 16  Go to Step 15 
14
IMPORTANT: Perform the recalibration procedure for the air temperature actuator.
Replace the appropriate air temperature actuator. Refer to Air Temperature Actuator Replacement - Left  or Air Temperature Actuator Replacement - Right .Did you complete the replacement?		 - Go to Step 16  -
15
IMPORTANT: Perform the recalibration procedure for the HVAC control module.
Replace the HVAC control module. Refer to HVAC Control Module Replacement .Did you complete the replacement?		 - Go to Step 16  -
16
  1. Use the scan tool in order to clear the DTCs.
  2. 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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