Circuit Description
The twilight delay switch is a potentiometer. The climate control panel (CCP) module determines the control setting based on the voltage from the twilight delay switch. The CCP module controls the head lamp automatic, on/off, and delayed off functions.
Conditions for Running the DTC
The CCP is powered.
Conditions for Setting the DTC
The feedback voltage is greater than 4.8V for more than 2 seconds.
Action Taken When the DTC Sets
The CCP sets the twilight status to ON.
Conditions for Clearing the DTC
The CCP does not detect a voltage above the predetermined value during the diagnostic self test.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Lighting System Diagnostic System Check? | -- | ||
Does the scan tool indicate the voltage is less than specified value? | 4.8 V | |||
3 |
Does the voltage measure near the specified value? | 5 V | ||
4 | Measure the voltage from the 5 volt reference circuit to the sensor return circuit at the fog lamp switch connector. Does the voltage measure near the specified value? | 5 V | ||
5 | Measure the voltage from the twilight delay signal circuit to the sensor return circuit at the fog lamp switch connector. Does the voltage measure near the specified value? | 5 V | ||
6 | Test the 5 volt reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
7 | Test the sensor return circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
8 | Test the twilight delay signal circuit for a short or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
9 | Inspect for poor connections at the fog light switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
10 | Inspect for poor connections at the CCP harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
11 | Replace the fog light switch. Refer to Fog Lamp Switch Replacement . Did you complete the replacement? | -- | -- | |
12 | Replace the CCP. Refer to Control Assembly Replacement in HVAC Systems - Manual. Did you complete the replacement? | -- | -- | |
13 | Operate the system in order to verify the repair. Did you find and correct the condition? | -- | System OK |
