Circuit Description
The following DTCs are for the left and right sunload sensors monitored by the instrument panel module (IPM):
The IPM monitors ambient light with the left and right sunload sensors. The sunload sensors are an infrared light sensitive photodiode. The IPM supplies 5 volts to the sunload sensors signal circuit and provides a low reference circuit. As the light shining upon the sensor gets brighter, the sensor conductance increases. The sensor signal decreases as the conductance increases. The IPM uses this information to compensate for the effect of the sun on the inside air temperature of the vehicle. The IPM converts the voltage values to count values where 1 volt is approximately equal to 51 counts.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B0184 Solar Load Sensor 1 left Circuit Range/Performance |
| • | DTC B0189 Solar Load Sensor 2 right Circuit Range/Performance |
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The IPM detects the sunload sensor signal circuit is less than 0.09 volt (5 counts) or more than 4.9 volts (250 counts).
Action Taken When the DTC Sets
A default value of 0 counts will be substituted for the sensor data by the IPM.
| • | Left sunload sensor |
| - | The Left Solar displayed on the scan tool in the HVAC Sensors data list will be the default value. |
| - | The Left Solar Sensor displayed on the scan tool in the Open/Short data list will be the actual value. |
| • | Right sunload sensor |
| - | The Right Solar displayed on the scan tool in the HVAC Sensor data list will be the default value. |
| - | The Right Solar Sensor displayed on the scan tool in the Open/Short data list will be the actual value. |
Conditions for Clearing the DTC
| • | The DTC will become history if the IPM no longer detects a failure. |
| • | The history DTC will clear after 50 fault-free ignition cycles. |
| • | The DTC can be cleared by using a scan tool. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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The operating range of the sensor is between 0.09-4.9 volts. If the scan tool displays a value between 0-0.08 volts or 4.91-5 volts, then the sensor is performing outside of its designed limits.
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This step tests for the proper operation of the circuit in the high voltage range.
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This step 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.
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This step tests the sensor signal circuit for a short to ground.
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This step tests the sensor signal circuit for a short to voltage, a high resistance, or an open.
-
This step tests the low reference circuit for a high resistance or an open.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool indicate that the Solar Sensor parameter is within the specified range? | 0.09-4.9 V | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |
Does the scan tool indicate that the Solar Sensor parameter is more than the specified value? | 4.9 V | Go to Step 4 | Go to Step 5 | |
Does the scan tool indicate that the Solar Sensor parameter is less than the specified value? | 0.09 V | Go to Step 8 | Go to Step 6 | |
Test the appropriate solar sensor signal circuit of the sunload sensor assembly 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 | |
Test the appropriate solar sensor signal circuit of the sunload sensor assembly 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 | |
Test the low reference circuit of the sunload sensor assembly 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 sensor 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 10 |
9 | Inspect for poor connections at the harness connector of the instrument panel module (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 12 | Go to Step 11 |
10 | Replace the sunload sensor assembly. Refer to Sunload and Twilight Sentinel Sensor Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | -- | Go to Step 12 | -- |
11 |
Important: : Perform the recalibration procedure for the IPM. Replace the instrument panel integration module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
