B2575

DTC B2575

Circuit Description

The high intensity discharge (HID) controller monitors the arc tube and ballast performance by checking the current and voltage levels on the arc tube voltage supply circuit. If the HID controller detects 5 faults in the same key cycle the DTC B2575 will be set as a current DTC. When the key is cycled the DTC is then stored in memory. When the DTC is current the controller will disable the headlamp until the key is cycled to the OFF position.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2575 Headlamp Control Circuit

Conditions for Running the DTC

The following conditions must be present before the DTC can set:

* The ignition is in the ON position.
* The headlamps are turned ON.

Conditions for Setting the DTC

The DTC will set immediately if the headlamp fails to strike an arc. The code will also set if the HID controller detects 5 failures during the same key cycle of any of the following faults.

* The voltage at the ballast is less than 8.6 volts.
* Auto test fails at power up.
* The voltage at the HID arc tube is greater than 115 volts.
* The voltage at the HID arc tube is less than 55 volts.
* The current at the HID arc tube is greater than 2 amps.

Action Taken When the DTC Sets

The headlamp will be commanded OFF by the HID controller.

Conditions for Clearing the DTC

The DTC will be stored in memory after one key cycle and the DTC will have to be present again before the headlamp is commanded OFF.

Test Description

Step 1 - Step 10:

The numbers below refer to the step numbers on the diagnostic table.
3. This step test allows time for the HID controller to monitor the headlamp operation.
4. This step tests for battery voltage at the appropriate headlamp.