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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 has overviews of all diagnostic categories.


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 02

B3410 05

B3410 05

B3410 08

Headlamp Leveling Sensor Signal - Rear

B3420 02

B3420 05

B3420 05

B3420 08

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 5 V 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 DTC will set when the headlamp control module detects no signal and low voltage on the sensor signal line.

B3415 02

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 disables the headlamp leveling system.

• Headlamp leveling inoperative indication ON.

• 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

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 information on diagnostic tools

Circuit/System Testing


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

2. Disconnect the negative terminal of the C1 Battery.

3. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.

4. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K26 Headlamp Control Module.

5. Reconnect the negative terminal to the C1 Battery.

6. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

7. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K26 Headlamp Control Module

8. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K26 Headlamp Control Module.

9. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.

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 K26 Headlamp Control Module.

11. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K26 Headlamp Control Module.

12. Ignition OFF, connect the harness connector to the appropriate headlamp leveling sensor.

13. Ignition ON, automatic light ON.

14. Move a piece of sheet metal in the air gap between the appropriate headlamp leveling sensor and the sensor metal plate. The value of the scan tool leveling sensor parameter listed below should vary:

• Front Levelling Position Sensor

• Rear Levelling Position Sensor

15. If the appropriate value does not change, replace the appropriate headlamp leveling sensor.

16. Move a piece of sheet metal in the air gap between the appropriate headlamp leveling sensor and the sensor metal plate. The headlamps low beam should move up or down.

17. If the headlamps low beam does not move up or down, replace the K26 Headlamp Control Module.


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 control module replacement, setup, and programming