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 06
- AHLD Front Axle Sensor Signal Circuit Low Voltage/Open
DTC B3420 01
- AHLD Rear Axle Sensor Signal Circuit Short to Battery
DTC B3420 06
- AHLD Rear Axle Sensor Signal Circuit Low Voltage/Open
Diagnostic Fault Information
Circuit/System Description
Each headlamp assembly contains a headlamp leveling motor that is controlled by the headlamp control module. The front and rear suspension position sensors provide the headlamp control module with suspension position information. Each sensor receives a 5-volt reference, signal, and low reference circuits from the headlamp control module. The sensors are connected to the control arms of 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 sensor to change. The headlamp control module compares the information from both suspension position sensors and adjusts the headlamp leveling as needed.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Engine RUNNING.
* Headlamps ON.
Conditions for Setting the DTC
DTC B3410 01
The headlamp control module detects a short to voltage in the front suspension position sensor signal circuit.
DTC B3410 06
The headlamp control module detects a short to ground or an open/high resistance in the front suspension position sensor signal circuit.
DTC B3420 01
The headlamp control module detects a short to voltage in the rear suspension position sensor signal circuit.
DTC B3420 06
The headlamp control module detects a short to ground or an open/high resistance in the rear suspension position sensor signal circuit.
Actions Taken When the DTC Sets
* The headlamp control module disables the headlamp leveling system.
* The driver information center (DIC) will display AFL Lamps Need Service.
* On vehicles equipped with both AFL and headlamp leveling, the AFL system will remain active.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.
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
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, disconnect the harness connector at the appropriate B152L suspension position sensor, ignition ON.
2. Verify a test lamp illuminates between the low reference circuit terminal 2 and B+.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the harness connector at the K26 headlamp 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 K26 headlamp control module.
• If the test lamp illuminates
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 K26 headlamp 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 K26 headlamp control module.
• If greater than 5.2 V
1. Ignition OFF, disconnect the harness connector at the K26 headlamp 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 K26 headlamp control module.
• If between 4.8-5.2 V
5. Verify the appropriate scan tool Leveling Position Sensor parameter is less than 1 V.
• If 1 V or greater
1. Ignition OFF, disconnect the harness connector at the K26 headlamp control module, ignition ON.
2. Test for less than 1 V between the signal circuit terminal 3 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K26 headlamp control module.
• If less than 1 V
6. Install a 3 A fused jumper wire between the 5-volt reference circuit terminal 1 and the signal circuit terminal 3.
7. Engine RUNNING, verify the appropriate scan tool Leveling Position Sensor parameter is greater than 4.8 V.
• If less than 4.8 V
1. Ignition OFF, disconnect the harness connector at the K26 headlamp 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 K26 headlamp control module.
• If 4.8 V or greater
8. Test or replace the appropriate B152L suspension position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Electronic Suspension Front Position Sensor Replacement Electronic Suspension Front Position Sensor Replacement
* Electronic Suspension Rear Position Sensor Replacement Electronic Suspension Rear Position Sensor Replacement
* Control Module References Control Module References for headlamp control module replacement, programming, and setup