Diagnostic Instructions
| • | 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. |
DTC Descriptor
DTC B2590 02: Left Cornering Lamp Circuit Short to GroundDTC B2590 04: Left Cornering Lamp Circuit Open
DTC 2595 02: Right Cornering Lamp Circuit Short to Ground
DTC 2595 04: Right Cornering Lamp Circuit Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition 1 | 2 | 2 | -- | -- |
Ignition 2 | 1 | 1 | -- | -- |
Left Headlamp Control | B2575 00 | B2575 04 | 2 | -- |
Right Headlamp Control | B2699 00 | B2575 04 | 2 | -- |
Cornering Lamp Voltage Supply | B2575 00, B2699 00 | 1 | -- | -- |
Headlamp Ground | -- | 1 | -- | -- |
1. Left Cornering Lamp Inoperative 2. Right Cornering Lamp Inoperative 3. Left Cornering Lamp always ON 4. Right Cornering Lamp always ON | ||||
Circuit/System Description
The cornering lamp is activated automatically at vehicle speeds below 40 km/h (25 MPH) when the direction indicator is switched ON and/or when the steering angle is changed from the straight-ahead position towards the side the vehicle is going to turn and passes a programmable angle threshold. The cornering lamp is deactivated automatically when the direction indicator is switched OFF and/or the steering angle has returned in the straight-ahead position. The cornering lamps are deactivated at vehicle speeds above 40 km/h (25 MPH). If reverse gear is active, the cornering lamps go into park function. Both lamps will be switched on. They will switch off 20 s after leaving reverse gear or if the vehicle speed exceeds 7 km/h (4 MPH). The cornering lamps also provide a protection against overheating. When having been continuously switched on for 2 min, automatic headlamp leveling will deactivate the lamps for 2 min to enable cooling down.
Conditions for Running the DTC
The headlamp control module will attempt to switch ON the cornering lights.
Conditions for Setting the DTC
B2590 02 or B2595 02
The DTC will set when the headlamp control module detects low voltage on the sensor control circuit.
B2590 04 or B2595 04
The DTC will set when the headlamp control module detects no signal and high voltage on the sensor signal line.
Action Taken When the DTC Sets
| • | The headlamp control module will not attempt to switch ON the cornering lights. |
| • | Advanced front lighting system fault indication ON |
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that DTC B3415 is not present.
| ⇒ | If DTC is present, refer to DTC B3415 |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate headlamp assembly.
- Ignition OFF, test for less than 5 Ω between the ground circuit terminal 1 and ground.
- Ignition OFF, disconnect the harness connector X2 at the K26 Headlamp Control Module.
- Ignition ON, verify that a test lamp illuminates between the ignition 1 circuit terminal 1 and ground
- Ignition ON, verify that a test lamp illuminates between the ignition 2 circuit terminal 2 and ground
- Reconnect the harness connector at the K26 Headlamp Control Module.
- Ignition ON, connect a test lamp between the control circuit terminal 9 at the appropriate headlamp assembly. Command the appropriate Cornering Lamp test ON and OFF with the scan tool, verify that the test lamp changes between turn ON and OFF.
- If all circuits test normal, replace the appropriate headlamp assembly or bulb.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, test the ignition 1 circuit for open/high resistance or short to ground. |
| ⇒ | If the test lamp does not illuminate, test the ignition 2 circuit for open/high resistance or short to ground. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K26 Headlamp Control Module. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K26 Headlamp Control Module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for headlamp control module replacement, setup, and programming |
