Circuit Description
The solar sensor is a photo-electric cell that provides sunload input to the HVAC Control Assembly. The input for the sunload is at terminal C2 of the HVAC Control Assembly. This is used by the HVAC Control Assembly for temperature control compensation based on additional heat from the sun (sunload).
Conditions for Setting the DTC
The HVAC Control Assembly continuously monitors CKT 590. DTC B0348 will set when CKT 590 stays at 4.5 volts or higher.
Action Taken When the DTC Sets
| • | Stores a DTC B0348 in the HVAC Control Assembly memory. |
| • | The system will default and assume no solar load is present. |
Conditions for Clearing the DTC
| • | Use the IPC clearing feature. |
| • | Using a scan tool. |
| • | A history DTC will clear after 50 consecutive ignition cycles if the condition for the fault is no longer present. |
Diagnostic Aids
| • | If the DTC is a history or intermittent. Try performing the tests shown while moving the wiring harnesses and connectors, this can often cause the malfunction to appear. |
| • | Visually inspect sensor connector and harness for damage, corrosion or water intrusion. |
| • | Check for adequate terminal tension, mis-routed harness, rubbed through wire insulation, and broken wire(s) inside the insulation. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Tests for the proper operation of the circuit in the high voltage range.
-
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.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the HVAC (CJ2) Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Does the scan tool indicate that the Sunload Air Temp Sensor parameter is within the specified range? | 0.1-4.9 Volts | Go to Diagnostic Aids | Go to Step 3 |
Does the scan tool indicate that the Sunload Air Temp Sensor parameter is greater than the specified value? | 4.9 Volts | Go to Step 4 | Go to Step 5 | |
Does the scan tool indicate that the Sunload Air Temp Sensor parameter is less than the specified value? | 0.1 Volts | Go to Step 8 | Go to Step 6 | |
5 | Test the signal circuit of the Sunload Air Temp Sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 |
6 | Test the signal circuit of the Sunload Air Temp Sensor 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 12 | Go to Step 7 |
7 | Test the ground circuit of the Sunload Air Temp 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 12 | Go to Step 9 |
8 | Inspect for poor connections at the harness connector of the Sunload Air Temp 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 12 | Go to Step 10 |
9 | Inspect for poor connections at the harness connector of the HVAC Control 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 12 | Go to Step 11 |
10 | Replace the Sunload Air Temp Sensor. Refer to Sun Load Sensor Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
11 | Replace the HVAC Control Assembly. Refer to Control Assembly Replacement . Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
