DTC B3410 or B3420
| DTC B3410 or B3420 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC B3410 01
Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Short to Battery
DTC B3410 06
Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Low Voltage/Open
DTC B3420 01
Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Short to Battery
DTC B3420 06
Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Low Voltage/Open
| 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 | - | B3410 06 | - | - |
| 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 |
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Battery voltage must be between 9-16 V.
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The ignition is in the ON or RUN position.
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The headlamps are ON.
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| Conditions for Setting the DTC |
B3410 01 or B3420 01
The headlamp leveling control module detects a short to battery on the sensor signal line.B3410 06 or B3420 06
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 |
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The headlamp control module disables the headlamp leveling system.
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The driver information center will display Service AFL Lamp message.
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| Conditions for Clearing the DTC |
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The DTC will be current for as long as the fault is present.
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When the fault is no longer present, the DTC will be a history DTC.
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A history DTC will clear after 50 ignition cycles.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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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.
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| 2. |
Test for less than 5 Ω between the low reference circuit terminal 3 and ground.
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| 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.
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| 4. |
Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal 1 and ground.
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| 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.
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| 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.
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| 7. |
Verify the appropriate scan tool Leveling Position Sensor parameter is 0 V.
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| 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.
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| 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.
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| 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.
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| 11. |
If all circuits test normal, replace the B51 headlamp leveling sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Headlamp Leveling Front Suspension Height Sensor Replacement
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Headlamp Leveling Rear Suspension Height Sensor Replacement
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Control Module References
for headlamp leveling control module replacement, setup, and programming
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