Circuit Description
The twilight photocell sensor is a light sensitive diode. The Instrument Panel Module determines the ambient light based on the voltage from the twilight photocell sensor. The IPM sends out a class 2 message to the dash integration module (DIM).
Conditions for Running the DTC
The IPM is powered.
Conditions for Setting the DTC
The twilight photocell voltage is less than 0.09 V or greater than 4.75 V.
Action Taken When the DTC Sets
| • | The IPM sets the variable ambient light status to status set to DARK. |
| • | The IPM sets a DTC. |
Conditions for Clearing the MIL/DTC
The IPM does not detect a voltage that is less than or greater than the predetermined value during the diagnostic self test.
Test Description
The numbers below refer to the step numbers 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 Lighting Systems Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the scan tool indicate that the Twilight Photocell data parameter is within the specified range? | 0.09-4.8 V | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
Does the scan tool indicate that the Twilight Photocell data parameter is greater than the specified value? | 4.8 V | Go to Step 4 | Go to Step 5 | |
Does the scan tool indicate that the Twilight Photocell data parameter is less than the specified value? | 0.09 V | Go to Step 8 | Go to Step 6 | |
5 | Test the signal circuit of the twilight photocell 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 twilight photocell 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 sensors return circuit of the twilight photocell 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 twilight photocell 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 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 twilight photocell sensor. Refer to Sunload and Twilight Sentinel Sensor Replacement in Instrument Panel, Gauges and Console. Did you complete the replacement? | -- | Go to Step 12 | -- |
11 | Replace the IPM. Refer to Instrument Panel Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
