Circuit Description
The dash integration module (DIM) monitors the refrigerant temperature through an A/C refrigerant low temperature sensor. When the refrigerant is cold, the sensor resistance and signal voltage are high. When the refrigerant is warm, the sensor resistance and signal voltage are low. The DIM will not request A/C compressor clutch engagement when the A/C refrigerant low temperature sensor is out of range.
Conditions for Running the DTC
The ignition is turned ON.
Conditions for Setting the DTC
The DIM detects the signal circuit is less than 0.09 V or greater than 4.90 V.
Action Taken When the DTC Sets
| • | A default value of 5°C (41°F) will be used for the sensor data by the DIM to allow operation of the A/C system. |
| • | The driver information center will display SERVICE A/C SYSTEM. |
Conditions for Clearing the DTC
| • | The DTC will become history if the DIM no longer detects a failure. |
| • | The history DTC will clear after 40 fault free ignition cycles. |
| • | The DTC can be cleared with a scan tool. |
Diagnostic Aids
If the condition is not present, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Tests for the proper operation of the circuit in the high voltage range.
-
Perform the recalibration procedure for the dash integration module.
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 | |
2 |
Does the scan tool indicate that B1321 is a current DTC? | -- | Go to Step 3 | Go to Diagnostic Aids |
Does the voltage measure near the specified value? | 5.0 V | Go to Step 6 | Go to Step 4 | |
4 | Test the signal circuit of the A/C refrigerant low temperature sensor for a an open, a short to voltage, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 5 |
5 | Test the low reference circuit of the A/C refrigerant low temperature sensor 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 10 | Go to Step 7 |
6 | Inspect for poor connections at the harness connector of the A/C refrigerant low 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 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the dash integration 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 10 | Go to Step 9 |
8 | Replace the A/C refrigerant low temperature sensor. Refer to Air Conditioning (A/C) Refrigerant Low Temperature Sensor Replacement in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? | -- | Go to Step 10 | -- |
|
Important: Perform the recalibration procedure for the dash integration module. Replace the dash integration module. Refer to Dash Integration Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 10 | -- | |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
