PRE-RELEASE
DTC B2575 or B2699
| DTC B2575 or B2699 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC B2575 01
Left Headlamp Control Circuit Short to Battery
DTC B2575 02
Left Headlamp Control Circuit Short to Ground
DTC B2575 04
Left Headlamp Control Circuit Open
DTC B2699 01
Right Headlamp Control Circuit Short to Battery
DTC B2699 02
Right Headlamp Control Circuit Short to Ground
DTC B2699 04
Right Headlamp Control Circuit Open
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| BCM B+ | B2575 04 | B2575 04 | - | - |
| BCM B+ | B2699 02 | B2699 02 | - | - |
| Left Headlamp Control | B2575 02 | B2575 04 | B2575 01 | - |
| Right Headlamp Control | B2699 02 | B2699 04 | B2699 01 | - |
| Circuit/System Description |
When the headlight switch is placed in low beam position, the body control module (BCM) applies a voltage to the low beam headlamps through their respective voltage supply circuits.
| Conditions for Running the DTC |
The headlamps are turned ON.
| Conditions for Setting the DTC |
B2575 01
The BCM detects a short to voltage on the left headlamp low beam control circuit.B2575 02
The BCM detects a short to ground on the left headlamp low beam control circuit.B2575 04
The BCM detects an open on the left headlamp low beam control circuit or an open/high resistance on the left headlamp low beam ground circuit.B2699 01
The BCM detects a short to voltage on the right headlamp low beam control circuit.B2699 02
The BCM detects a short to ground on the right headlamp low beam control circuit.B2699 04
The BCM detects an open on the right headlamp low beam control circuit or an open/high resistance on the right headlamp low beam ground circuit.| Action Taken When the DTC Sets |
For B2575 02, B2575 04, B2699 02 or B2699 04, the appropriate headlamp low beam will be inoperative.
For B2575 01 or B2699 01, the appropriate headlamp low beam will be continuously illuminated.
| Conditions for Clearing the DTC |
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The DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
Ignition ON, observe the function of the E4G headlamp-left low beam and the E4F headlamp-right low beam while commanding the low beam lamps ON and OFF with a scan tool. The E4G headlamp-left low beam and the E4F headlamp-right low beam should turn ON and OFF while changing between the commanded states.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness X1 harness connector at the K9 BCM.
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| 2. |
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal listed below and ground:
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B+ circuit terminal 3
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B+ circuit terminal 4
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| 3. |
If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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| 4. |
Ignition OFF, connect the harness X1 harness connector at the K9 BCM.
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| 5. |
Disconnect the inline harness connector at the appropriate E4 headlamp-low beam listed below:
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E4G headlamp-left low beam X115 inline harness connector
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E4F headlamp-right low beam X116 inline harness connector
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| 6. |
Connect a test lamp between the control circuit terminal G and ground.
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| 7. |
Ignition ON, command the low beam lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF while changing between the commanded states.
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If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
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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 K9 BCM
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| 10. |
If all circuits test normal, replace the headlamp bulb or the headlamp.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Headlamp Replacement (T84 T85)
Headlamp Replacement (TT6 HID)
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Control Module References
for BCM replacement, setup, and programming
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