Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This test resets HVAC control module (IPM) and checks for current air temperature DTC.
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This checks for proper operation of coolant system to insure heater output.
Step | Action | Values | Yes | No | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: Heating Insufficient Auxiliary. | ||||||||||||||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |||||||||||||
Does the scan tool display DTC B1340 or B1341? | -- | Go to Step 3 | ||||||||||||||
3 | Does the Too Cold in Vehicle occur to the front seating areas also? | -- | Go to Too Cold in Vehicle | Go to Step 4 | ||||||||||||
4 | Place the auxiliary blower motor switch in each speed position. Does the auxiliary blower motor operate in each speed position? | -- | Go to Step 5 | |||||||||||||
5 | Does the blower motor provide sufficient air flow? | -- | Go to Step 6 | |||||||||||||
6 | Does the Too Cold in Vehicle concern occur when heating or defrosting is desired? | -- | Go to Step 7 | Go to Step 9 | ||||||||||||
7 |
Does the A/C compressor operate? | -- | Go to Step 8 | |||||||||||||
Inspect the cooling system for the following conditions:
Refer to Heating Performance Diagnostic in Heating, Ventilation and Air Conditioning Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 9 | |||||||||||||
9 |
Do the counts change when actuator is commanded? | -- | Go to Step 10 | Go to Step 15 | ||||||||||||
10 | Inspect the right air temperature door and the right air temperature actuator for the following conditions:
Refer to Air Temperature Actuator Replacement - Right Side Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 11 | ||||||||||||
11 | Check the upper left, upper right, lower left and lower right air temperature sensors for proper installation. Refer to Air Temperature Sensor Replacement - Upper Left Side , Air Temperature Sensor Replacement - Upper Right Side , Air Temperature Sensor Replacement - Lower Left Side and Air Temperature Sensor Replacement - Lower Right Side . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 12 | ||||||||||||
12 | Inspect for airflow through the inside air temperature assembly by placing a 5-cm (2-in) square piece of paper over the sensor air inlet. Does the paper stay in place? | -- | Go to Step 13 | Go to Step 18 | ||||||||||||
13 |
Does the scan tool indicate that the sensor temperatures are within the specifications at the thermometer temperatures? | -3 to +3°C (-5 to +5°F) | Go to Step 25 | Go to Step 14 | ||||||||||||
14 | Test the suspect air temperature sensor resistance. Refer to Sensor Resistance Table . Does the resistance measure near the Sensor Resistance Table? | -- | Go to Step 20 | Go to Step 17 | ||||||||||||
15 | Test the right air temperature actuator door control circuit for a short to voltage, short to ground, open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 16 | ||||||||||||
16 | Test the right air temperature actuator ignition 3 voltage circuit for a short to ground, open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 19 | ||||||||||||
17 | Inspect for poor connections at the harness connector of the suspect air temperature sensor. 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 25 | Go to Step 21 | ||||||||||||
18 | Inspect for poor connections at the harness connector of the inside air temperature 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 25 | Go to Step 22 | ||||||||||||
19 | Inspect for poor connections at the harness connector of the right 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 25 | Go to Step 23 | ||||||||||||
20 | Inspect for poor connections at the harness connector of the IPM. 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 25 | Go to Step 24 | ||||||||||||
21 | Replace suspect the temperature sensor. Refer to the following procedures: Did you complete the replacement? | -- | Go to Step 25 | -- | ||||||||||||
22 | Replace the inside air temperature assembly. Refer to Inside Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 25 | -- | ||||||||||||
23 |
Important: Perform the recalibration procedure for the right air temperature actuator. Replace the right air temperature actuator. Refer to Air Temperature Actuator Replacement - Right Side . Did you complete the replacement? | -- | Go to Step 25 | -- | ||||||||||||
24 |
Important: Perform the recalibration procedure for the IPM. Replace the IPM. Refer to HVAC Control Module Replacement . Did you complete the replacement? | -- | Go to Step 25 | -- | ||||||||||||
25 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 | ||||||||||||
