The numbers below refer to the step numbers on the diagnostic table.
The DTCs listed may set, if there is a concern with the actuator, when a calibration of the actuators is performed.
This action ensures that the internal fan of the inside air temperature sensor assembly is providing air flow across the internal sensor.
Step | Action | Values | Yes | No | ||||||||||||
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Schematic Reference: HVAC Schematics DEFINITION: Temperature can not be adjusted or heating insufficient. | ||||||||||||||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |||||||||||||
Important:: If during this diagnostic procedure the HVAC control module is disconnected a recalibration of actuators must be performed to avoid misdiagnosis.
Does the scan tool display DTC B0229, B0414, B0434, B3761 or B3764? | -- | Go to Step 3 | ||||||||||||||
3 | Place the blower motor switch in each speed position. Does the blower motor operate in any of the speed positions? | -- | Go to Step 4 | Go to Blower Motor Inoperative | ||||||||||||
4 | Does the blower motor operate at the desired speed in each speed position? | -- | Go to Step 5 | Go to Blower Motor Malfunction | ||||||||||||
5 | Does the Too Cold in Vehicle concern occur when heating or defrosting is desired? | -- | Go to Step 6 | Go to Step 9 | ||||||||||||
6 |
Does the A/C compressor operate? | -- | Go to Step 7 | |||||||||||||
7 | Perform the Heating Performance Diagnostic. Refer to Heating Performance Diagnostic in Heating, Ventilation and Air Conditioning. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 8 | ||||||||||||
8 | Inspect the heating and cooling system for the following:
Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 9 | ||||||||||||
9 | Inspect the air temperature sensors for the following conditions:
Refer to the following procedures: Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 10 | ||||||||||||
Does the paper stay in place? | -- | Go to Step 11 | Go to Step 15 | |||||||||||||
11 |
Does the scan tool indicate that the Solar Sensor data parameter is greater than the specified value? | 230 Counts | Go to Step 12 | Go to Step 20 | ||||||||||||
12 |
Do the counts change? | -- | Go to Step 13 | Go to Step 20 | ||||||||||||
13 |
Does the scan tool indicate sensor temperatures are within 3°C (5°F) of the thermometer temperatures? | -- | Go to Step 14 | Go to Step 17 | ||||||||||||
14 |
Does the resistance measure near the sensor resistance table value? | -- | System OK | Go to Step 19 | ||||||||||||
15 | Test the ignition 1 voltage circuit of the inside air temperature sensor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 16 | ||||||||||||
16 | Test the ground circuit of the inside air temperature sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 17 | ||||||||||||
17 | Inspect for poor connections at the harness connector of the inside 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 26 | Go to Step 18 | ||||||||||||
18 | Test the inside air temperature sensor resistance. Refer to the Sensor Resistance Table . Does the resistance measure near the Sensor Resistance Table value? | -- | Go to Step 21 | Go to Step 22 | ||||||||||||
19 | Inspect for poor connections at the harness connector of the upper and lower air temperature sensors. 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 26 | Go to Step 23 | ||||||||||||
20 | Inspect for poor connections at the harness connector of the sunload 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 26 | Go to Step 24 | ||||||||||||
21 | 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 26 | Go to Step 25 | ||||||||||||
22 | Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 26 | -- | ||||||||||||
23 | Replace the inside air temperature sensor. Refer to one of the following procedures: Did you complete the replacement? | -- | Go to Step 26 | -- | ||||||||||||
24 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Did you complete the replacement? | -- | Go to Step 26 | -- | ||||||||||||
25 |
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 26 | -- | ||||||||||||
26 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |