DTC B2575 or B2699
Diagnostic Instructions
DTC Descriptors
| DTC B2575 00: Left Headlamp Control Circuit
Malfunction |
| DTC B2575 04: Left Headlamp Control Circuit
Open |
| DTC B2699 00: Right Headlamp Control Circuit
Malfunction |
| DTC B2699 04: Right Headlamp Control Circuit
Open |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Headlamp Voltage Supply
|
B2575 00, B2699 00
|
1
|
-
|
-
|
Left Headlamp Control
|
B2575 00
|
B2575 04
|
-
|
-
|
Right Headlamp Control
|
B2699 00
|
B2699 04
|
-
|
-
|
Headlamp Ground
|
-
|
1
|
-
|
-
|
1. Headlamp inoperative
|
|
| |
Circuit/System Description
The body control module (BCM) controls the headlamps based on
the inputs explained above. When a low beam request is received,
the BCM grounds the headlamp low beam relay control circuit. This
energizes the coil in the headlamp low beam relay, causing the
relay switch to close. This then applies B+ to both low beam high
intensity discharge (HID) headlamps through the left low beam and
right low beam fuses, illuminating the low beam headlamps. When a
high beam request is received, the BCM grounds the headlamp high
beam relay control circuit. This energizes the coil in the high
beam relay, causing the relay switch to close. This then applies B+
to both low beam HID headlamps through the left high beam and right
high beam fuses, illuminating the high beam headlamps.
Conditions for Running the DTC
The headlamp control module will attempt to switch ON the
cornering lights.
Conditions for Setting the DTC
B2575 00 or B2699 00
The DTC will set when the headlamp control module detects no signal
and low voltage on the sensor signal line.
B2575 04 or B2699 04
The DTC will set when the headlamp control module detects no signal
and high voltage on the sensor signal line.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer
exists.
Reference Information
Schematic Reference
Headlights/Daytime Running Lights (DRL) Schematics
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 Testing
| 1. |
Ignition OFF, disconnect the
appropriate harness connector at the inoperative headlamp lamp
listed below: |
| 2. |
Disconnect the negative
terminal of the C1 Battery. |
| 3. |
Test for less than 5 Ω
between the appropriate headlamp ground circuit harness connector
terminal 1 and ground. |
| ⇒ |
If greater than the specified value, test the
ground circuit for an open/high resistance. |
| 4. |
Reconnect the negative
terminal to the C1 Battery. |
| 5. |
Remove the appropriate fuse
listed below: |
| 6. |
Install a 10 A fused jumper
wire between appropriate fuse output contact and B+. Verify that
the appropriate headlamp illuminates. |
| ⇒ |
If the headlamp does not illuminate, test the
signal circuit for a short to ground or an open/high resistance. If
the circuit tests normal, replace the appropriate headlamp assembly
or bulb. |
| 7. |
If all circuits test normal,
replace the K28 Headlamp Leveling Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
