DTC B018A, B048C, B048F, or B1395 |
Diagnostic Instructions |
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
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Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
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Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors |
Diagnostic Fault Information |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Windshield Temperature and Inside Moisture Sensor 5V Reference |
B1395 03 |
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B1395 07 |
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Humidity Signal |
B048C 02 |
B048C 05 |
B048C 05 |
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Humidity Temperature Signal |
B048F 02 |
B048F 05 |
B048F 05 |
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Windshield Temperature Signal |
B018A 02 |
B018A 05 |
B018A 05 |
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Windshield Temperature and Inside Moisture Sensor Ground |
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B018A 05, B048C 05, B048F 05, |
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Circuit/System Description |
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Relative humidity level at windshield inside |
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Temperature of the windshield inside |
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Temperature of the humidity sensor element |
Conditions for Running the DTC |
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Ignition ON. |
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The HVAC control module is ON. |
Conditions for Setting the DTC |
Action Taken When the DTC Sets |
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The system will use the last valid values as default. |
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If no value is read at the time of fault, the HVAC control module uses 60% for humidity. |
Conditions for Clearing the DTC |
Reference Information |
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Circuit/System Verification |
1. |
Verify that DTC B1395 03 or B1395 07 is not present. |
2. |
If DTC is present, refer to Windshield Temperature And Inside Moisture Sensor Power Supply Malfunction. |
3. |
Verify that DTC B048C 02 or B048C 05 is not present. |
4. |
If DTC is present, refer to Humidity Sensor Humidity Circuit Malfunction. |
5. |
Verify that DTC B048F 02 or B048F 05 is not present. |
6. |
If DTC is present, refer to Humidity Sensor Temperature Circuit Malfunction. |
7. |
Verify that DTC B018A 02 or B018A 05 is not present. |
8. |
If DTC is present, refer to Windshield Temperature Sensor Circuit Malfunction. |
9. |
Measure actual temperature using a thermometer at the windshield temperature and inside moisture sensor. Compare this value to the scan tool Passenger Compartment Humidity Sensor Temperature parameter. The measured temperature should be within 5°C (9°F) difference of parameter value. |
10. |
If not within the specified range, replace the B160 Windshield Temperature and Inside Moisture Sensor. |
11. |
Measure actual temperature using a thermometer at the windshield temperature and inside moisture sensor. Compare this value to the scan tool Windshield Temperature parameter. The measured temperature should be within 5°C (9°F) difference of parameter value. |
12. |
If not within the specified range, replace the B160 Windshield Temperature and Inside Moisture Sensor. |
Circuit/System Testing |
1. |
Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor. |
2. |
Test for less than 5 Ω between the ground circuit terminal 3 and ground. |
3. |
If greater than the specified range, test the ground circuit for an open/high resistance. |
4. |
Ignition ON, test for 4.8-5.2 V between the ground circuit terminal 3 and the reference voltage circuit terminal 1. |
5. |
If less than the specified range, test the reference voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module. |
6. |
If greater than the specified range, test the reference voltage circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control Module. |
7. |
If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor. |
1. |
Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor. |
2. |
Test for less than 5 Ω between the ground circuit terminal 3 and ground. |
3. |
If greater than the specified range, test the ground circuit for an open/high resistance. |
4. |
Ignition ON, test for 4.8-5.2 V between the ground circuit terminal 3 and the reference voltage circuit terminal 1. |
5. |
If less than the specified range, test the reference voltage circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module. |
6. |
Test for 4.8-5.2 V between the signal circuit terminal 2 and ground. |
7. |
If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module. |
8. |
If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module. |
9. |
If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset. |
10. |
If the DTC resets, replace the K33 HVAC Control Module. |
1. |
Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor. |
2. |
Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 5 and ground. |
3. |
If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module. |
4. |
If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module. |
5. |
If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset. |
6. |
If the DTC resets, replace the K33 HVAC Control Module. |
1. |
Ignition OFF, disconnect the harness connector at the B160 Windshield Temperature and Inside Moisture Sensor. |
2. |
Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 4 and ground. |
3. |
If less than the specified range, test the signal circuit terminal for a short to ground or open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module. |
4. |
If greater than the specified range, test the signal circuit terminal for a short to battery. If the circuit tests normal, replace the K33 HVAC Control Module. |
5. |
If all circuits test normal, replace the B160 Windshield Temperature and Inside Moisture Sensor and verify the DTC does not reset. |
6. |
If the DTC resets, replace the K33 HVAC Control Module. |
Repair Instructions |
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Inside Air Moisture and Windshield Temperature Sensor Replacement
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Control Module References for HVAC control module replacement, setup, and programming |