• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Ambient Light Sensor Signal | B2645 03 | B2645 07 | B2645 07 | -- |
Left Sun Load Sensor Signal | B0183 06 | B0183 06 | B0183 06 | -- |
Right Sun Load Sensor Signal | B0188 06 | B0188 06 | B0188 06 | -- |
Left Front Turn Signal Lamp Control | 1 | 1 | 1 | -- |
Right Front Turn Signal Lamp Control | 1 | 1 | 1 | -- |
Ambient Light Sensor Low Reference | -- | B2645 07 | B0183 06, B0188 06 | -- |
Turn Signal Lamp - LF Ground | -- | 1 | 1 | -- |
Turn Signal Lamp - RF Ground | -- | 1 | 1 | -- |
1. Turn Signal Lamps and/or Indicators Malfunction |
The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The HVAC control module provides a low reference ground and 5-volt reference signals to the ambient light sensor. The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions the BCM will command the DRLs ON. During low light conditions the BCM will command the low beam headlamps ON. Any function or condition that turns on the headlamps will cancel DRL operation. With the turn signal/multifunction switch in the OFF position, the DRLs which consists of the front turn signal lamps will either be turned ON or OFF after a 30 second delay, depending on whether daylight or low light conditions are sensed by the ambient light sensor.
Battery voltage must be between 9-16 volts.
The DTC will set when the BCM detects a short to ground in the ambient light sensor signal circuit.
The DTC will set when the BCM detects a short to voltage or an open/high resistance in the ambient light sensor signal circuit.
• | Automatic lamp control (ALC) is inoperative. |
• | The BCM defaults to low light status and commands the low beam headlamps ON. |
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. |
Headlights/Daytime Running Lights (DRL) Schematics
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC control module. |
⇒ | If less than the specified range, test the signal circuit terminal D for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM or HVAC control module replacement, setup, and programming |