DTC B2590 or B2595
Diagnostic Instructions
DTC Descriptors
| DTC B2590 02: Left Cornering Lamp Circuit
Short to Ground |
| DTC B2590 04: Left Cornering Lamp Circuit
Open |
| DTC B2595 02: Right Cornering Lamp Circuit
Short to Ground |
| DTC B2595 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
|
B2590 02
|
B2590 04
|
3
|
-
|
Right Headlamp Control
|
B2595 02
|
B2595 04
|
4
|
-
|
Headlamp Ground
|
-
|
1, 2
|
-
|
-
|
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
Component Connector End Views
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
| 1. |
Ignition OFF, disconnect the
harness connector at the appropriate headlamp assembly.
|
| 2. |
Disconnect the negative
terminal of the C1 Battery. |
| 3. |
Test for less than 5 Ω
between the ground circuit terminal 1 and ground. |
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
| 4. |
Reconnect the negative
terminal to the C1 Battery. |
| 5. |
Disconnect the harness
connector X2 at the K28 Headlamp Leveling Control Module.
|
| 6. |
Ignition ON, verify that a
test lamp illuminates between the ignition 1 circuit terminal 1 and
ground |
| ⇒ |
If the test lamp does not illuminate, test the
ignition 1 circuit for open/high resistance or short to
ground. |
| 7. |
Verify that a test lamp
illuminates between the ignition 2 circuit terminal 2 and
ground |
| ⇒ |
If the test lamp does not illuminate, test the
ignition 2 circuit for open/high resistance or short to
ground. |
| 8. |
Ignition OFF, reconnect the
harness connector at the K28 Headlamp Leveling Control
Module. |
| 9. |
Ignition ON, connect a test
lamp between the control circuit terminal 9 at the appropriate
headlamp assembly and ground. Command the appropriate Cornering
Lamp test ON and OFF with the scan tool, verify that the test lamp
turns ON and OFF. |
| ⇒ |
If the test lamp is always ON, test the control
circuit for a short to voltage. If the circuit tests normal,
replace the K28 Headlamp Leveling 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 K28 Headlamp Leveling Control
Module. |
| 10. |
If all circuits test normal,
replace the appropriate headlamp assembly or bulb. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
