B2419
Diagnostic Chart (Part 1 Of 2):
Diagnostic Chart (Part 2 Of 2):
Schematic:
CIRCUIT DESCRIPTION
The Instrument Panel Integration Module (IPM) receives an input from the ambient light sensor. The IPM supplies the ground for the sensor through the sensor return. The resistance of the ambient light sensor varies as the outside light changes. When the resistance of the ambient light sensor is less than 23 k Ohms for bright light. It is greater than 31 k Ohms for complete darkness. As the resistance of the ambient light sensor varies, the voltage input to the IPM changes. The IPM determines whether it is light or dark outside. The IPM then sends a message via the class 2 serial data line to the Dash Integration Module (DIM) and the Rear Integration Module (RIM) indicating whether it is light or dark outside.
CONDITIONS FOR SETTING THE DTC
The IPM will set the DTC B2419 any time it detects that the ambient sensor input voltage is out of range.
SPECIFICATION
Normal sensor input voltage: 0.33-4.70 V
ACTION TAKEN WHEN THE DTC SETS
The IPM will assume that the ambient light level indicates darkness for all functions needing the outside light status.
CONDITIONS FOR CLEARING THE DTC
The IPM sees that the ambient light sensor input voltage is within the valid range.
^ Use the On-Boards clearing DTCs feature.
^ Use a scan tool.
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
1. Perform the Lighting Systems Diagnostic System Check before continuing with the diagnosis of this DTC.
2. Checks if the value that the Instrument Panel Integration Module (IPM) is reading from the ambient light sensor is too high.
3. Checks if the value that the Instrument Panel Integration Module (IPM) is reading from the ambient light sensor is too low.
4. Checks if the DTC is still set.
6. Checks if the resistance of the ambient light sensor is too high.
9. Checks if the resistance of the ambient light sensor is too low.
14. Clear all DTCs after the repair procedure is complete.