PRE-RELEASE
Adaptive Forward Lighting Malfunction
| Adaptive Forward Lighting Malfunction |
| 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
has overviews of all diagnostic categories.
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| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Ignition Left Headlamp
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1, 2
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2
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-
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B1461 00
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Ignition Right Headlamp
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1, 3
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3
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-
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B1462 00
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Headlamp Leveling Sensor 5V Reference Front
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B3415 02
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1
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B3415 01
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-
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Headlamp Leveling Sensor 5V Reference Rear
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B3415 02
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1
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B3415 01
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-
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Headlamp Leveling Sensor Signal Front
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B3410 06
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B3410 06
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B3410 01
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-
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Headlamp Leveling Sensor Signal Rear
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B3420 06
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B3420 06
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B3420 01
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-
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Left Headlamp Control
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B2575 00
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B2575 04
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2
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-
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Right Headlamp Control
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B2699 00
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B2575 04
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3
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-
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Headlamp Leveling Sensor Low Reference Front
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-
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1
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-
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-
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Headlamp Leveling Sensor Low Reference Rear
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-
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1
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-
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-
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Left Headlamp Ground
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-
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2
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-
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B1461 00
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Right Headlamp Ground
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-
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3
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-
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B1462 00
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1. All Headlamp Actuator Malfunction
2. Left Headlamp Actuator Malfunction 3. Right Headlamp Actuator Malfunction |
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| Circuit/System Description |
Battery positive voltage is applied to the headlamp control module at all times. The headlamp control module has a normal operational voltage range of about 12.5-16 V and is only fully functional with the ignition switch is in the RUN position and the headlamp switch in the AUTOMATIC LIGHT position. The communications enable signal from the body control module (BCM) wakes the headlamp control module microprocessor. The headlamp control module receives serial data messages from the engine control module, transmission control module, electronic brake control module, and BCM with information regarding power mode, speed, steering angle, transmission gear selection, and headlamp switch status. The headlamp control module calculates the headlamp angle and sends commands to the left and right adaptive forward lighting system headlamp actuators. The headlamp actuators drive the headlamps to the position commanded by the headlamp control module. The headlamp control module monitors the headlamp actuator motor control circuits for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory and the driver will be notified with a message displayed over the driver information center located on the instrument cluster.
| 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 information on diagnostic tools
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the appropriate headlamp assembly.
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| 2. |
Test for less than 5 Ω between the E13L Headlamp Assembly - Left or E13R Headlamp Assembly - Right ground circuit terminal 8 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Test for less than 5 Ω between the K26 Headlamp Control Module ground circuit terminal 1 and ground.
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| 5. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 6. |
Ignition ON, headlamps ON, connect a test lamp between the K26 Headlamp Control Module ignition circuit terminal 10 and ground. The test lamp should turn ON.
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| 7. |
If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
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| 8. |
Ignition OFF, disconnect the X2 harness connector at the K26 Headlamp Control Module
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| 9. |
Ignition ON, connect a test lamp between the ignition circuit terminal 9 X1 at the K26 Headlamp Control Module and ground. The test lamp should turn ON.
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| 10. |
If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
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| 11. |
If all circuits test normal, replace the appropriate headlamp assembly. Verify that the customer concern is not still present.
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| 12. |
If the customer concern is still present, replace the K26 Headlamp Control Module.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Headlamp Replacement
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Control Module References
for headlamp control module replacement, setup, and programming
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