Diagnostic Instructions

DTC Descriptor

DTC B3415 01: Automatic Headlamp Leveling Control Module Axle Sensor Supply Circuit Short to Voltage

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 5 V Reference - Front	B3415 02	1	B3415 01	--
Headlamp Leveling Sensor 5 V 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

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

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.

Reference Information

Schematic Reference

Headlight Leveling 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 harness connector at the appropriate headlamp leveling sensor.
2. Test for less than 5 Ω between the low reference circuit terminal 3 and ground.

⇒	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.

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

⇒	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.

⇒	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.

4. Verify the appropriate scan tool Leveling Position Sensor parameter is less than 0 mm.

⇒	If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K26 Headlamp Control Module.

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 1. Verify the appropriate scan tool Leveling Position Sensor parameter is greater than 0 mm.

⇒	If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K26 Headlamp Control Module.

6. If all circuits test normal, replace the appropriate headlamp leveling sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.