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DTC B3415

DTC B3415

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 Descriptors

DTC B3415 01

Automatic Headlamp Leveling Control Module Axle Sensor Supply Circuit Short to Battery

DTC B3415 02

Automatic Headlamp Leveling Control Module Axle Sensor Supply Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Headlamp Leveling Sensor 5V Reference - Front B3415 02 1 B3415 01 -
Headlamp Leveling Sensor 5V Reference - Rear B3415 02 1 B3415 01 -
Headlamp Leveling Sensor Signal - Front B3410 06 B3410 06 B3410 01 -
Headlamp Leveling Sensor Signal - Rear B3420 06 B3420 06 B3420 01 -
Headlamp Leveling Sensor Low Reference - Front - 1 - -
Headlamp Leveling Sensor Low Reference - Rear - 1 - -
1. Headlamp Leveling Malfunction


Circuit/System Description

The front and rear suspension position sensors provide the headlamp control module with front and rear suspension position information. Each sensor receives a 5V reference, signal, and low reference circuits from the headlamp control module. The sensors are connected to the control arms at the front and rear suspension. As the vehicle travels, the suspension compresses and rebounds moving the suspension position sensor arms. This causes the signal output of the sensors to change. The headlamp control module compares the information from the front and rear suspension position sensors and adjusts the headlamp leveling as needed.

Conditions for Running the DTC


• Battery voltage must be between 9-16 V.

• The ignition is in the ON or RUN position.

• The headlamps are ON.


Conditions for Setting the DTC

B3415 01

The headlamp leveling control module detects a short to voltage on the sensor signal line.

B3415 02

The headlamp leveling control module detects a short to ground or an open/high resistance on the sensor signal line.

Action Taken When the DTC Sets


• The headlamp control module disables the headlamp leveling system.

• The driver information center will display Service AFL Lamp message.


Conditions for Clearing the DTC


• The DTC will be current for as long as the fault is present.

• When the fault is no longer present, the DTC will be a history DTC.

• A history DTC will clear after 50 ignition cycles.


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


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the appropriate B51 headlamp leveling sensor.

2. Test for less than 5 Ω between the low reference circuit terminal 3 and ground.

3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.

4. Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal 1 and ground.

5. If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.

6. If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K28 headlamp leveling control module.

7. Verify the appropriate scan tool Leveling Position Sensor parameter is 0 V.

8. If greater than the specified range, test the signal circuit pin 2 for a short to voltage. If the circuit tests normal, replace the K28 headlamp leveling control module.

9. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5V reference circuit terminal 1. Verify the appropriate scan tool Leveling Position Sensor parameter is greater than 5 V.

10. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.

11. If all circuits test normal, replace the B51 headlamp leveling sensor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Headlamp Leveling Front Suspension Height Sensor Replacement

• Headlamp Leveling Rear Suspension Height Sensor Replacement

• Control Module References for headlamp leveling control module replacement, setup, and programming