B3410
DTC B3410 or B3420
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B3410 01
- AHLD Front Axle Sensor Signal Circuit Short to Battery
DTC B3410 02
- AHLD Front Axle Sensor Signal Circuit Short to Ground
DTC B3410 03
- AHLD Front Axle Sensor Signal Circuit Voltage Below Threshold
DTC B3410 07
- AHLD Front Axle Sensor Signal Circuit Voltage Above Threshold
DTC B3420 01
- AHLD Rear Axle Sensor Signal Circuit Short to Battery
DTC B3420 02
- AHLD Rear Axle Sensor Signal Circuit Short to Ground
DTC B3420 03
- AHLD Rear Axle Sensor Signal Circuit Voltage Below Threshold
DTC B3420 07
- AHLD Rear Axle Sensor Signal Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
The front and rear suspension position sensors provide the headlamp leveling control module with front and rear suspension position information. Each sensor receives a 5 V reference, signal, and low reference circuits from the headlamp leveling control module. The sensor 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 leveling 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.
* Ignition ON.
* Headlamps ON.
Conditions for Setting the DTC
DTC B3410 01 or B3420 01
The headlamp leveling control module detects a short to voltage or an open/high resistance in the suspension position sensor 5 V reference circuit.
DTC B3410 02 or B3420 02
The headlamp leveling control module detects a short to ground in the suspension position sensor 5 V reference circuit.
DTC B3410 03 or B3420 03
The headlamp leveling control module detects a short to ground or an open/high resistance in the suspension position sensor signal circuit.
DTC B3410 07 or B3420 07
The headlamp leveling control module detects a short to voltage in the suspension position sensor signal circuit.
Actions Taken When the DTC Sets
* The headlamp leveling control module disables the headlamp leveling system.
* The instrument cluster will display Headlamp Leveling Malfunction - Contact Service.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists and the ignition is cycled.
* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.
Diagnostic Aids
Note: The headlamp leveling control module is not capable of detecting an actual mechanical failure of the suspension position sensors. When the headlamp leveling control module determines that the vehicle pitch angle is physically impossible, the headlamp leveling control module will assume that a mechanical failure has occurred to one of the suspension position sensors.
Reference Information
Schematic Reference
Headlights/Daytime Running Lights (DRL) Schematics Headlights/Daytime Running Lights (DRL) Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly - Primary
Description and Operation
Exterior Lighting Systems Description and Operation Exterior Lighting Systems
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF, exterior lamps OFF, disconnect the harness connector at the appropriate B152 suspension position sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 3 and ground.
• If 10 ohms or greater
1. Ignition OFF, disconnect the harness connector at the K28 headlamp leveling control module.
2. Test for less than 2 ohms in the low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K28 headlamp leveling control module.
• If less than 10 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
• If less than 4.8 V
1. Ignition OFF, disconnect the harness connector at the K28 headlamp leveling control module.
2. Test for infinite resistance between the 5 V reference circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the 5 V reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K28 headlamp leveling control module.
• If greater than 5.2 V
1. Ignition OFF, disconnect the harness connector at the K28 headlamp leveling control module, ignition ON.
2. Test for less than 1 V between the 5 V reference circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K28 headlamp leveling control module.
• If between 4.8-5.2 V
5. Verify the appropriate scan tool Leveling Position Sensor Signal parameter is less than 0.5 V.
• If 0.5 V or greater
1. Ignition OFF, disconnect the harness connector at the K28 headlamp leveling control module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal 2 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K28 headlamp leveling control module.
• If less than 0.5 V
6. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the signal circuit terminal 2.
7. Verify the appropriate scan tool Leveling Position Sensor Signal parameter is greater than 4.8 V.
• If less than 4.8 V
1. Ignition OFF, disconnect the harness connector at the K28 headlamp leveling control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K28 headlamp leveling control module.
• If 4.8 V or greater
8. Test or replace the appropriate B152 suspension position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Headlamp Leveling Front Suspension Height Sensor Replacement (Coupe) Headlamp Leveling Front Suspension Height Sensor Replacement (Coupe)
* Headlamp Leveling Rear Suspension Height Sensor Replacement (Coupe) Headlamp Leveling Rear Suspension Height Sensor Replacement (Coupe)
* Control Module References Control Module References for headlamp leveling control module replacement, programming, and setup