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 provides an overview of each diagnostic category. |
DTC Descriptors
DTC B3410 01: AHLD Front Axle Sensor Signal Circuit Short to BatteryDTC 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Headlamp Leveling Sensor 5 Volt Reference - Front | B3410 02 | B3410 02 | B3410 01 | -- |
Headlamp Leveling Sensor 5 Volt Reference - Rear | B3420 02 | B3420 02 | B3420 01 | -- |
Headlamp Leveling Sensor Signal - Front | B3410 03 | B3410 03 | B3410 07 | -- |
Headlamp Leveling Sensor Signal - Rear | B3420 03 | B3420 03 | B3420 07 | -- |
Headlamp Leveling Sensor Low Reference - Front | -- | 1 | 1 | -- |
Headlamp Leveling Sensor Low Reference - Rear | -- | 1 | 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-volt 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 volts. |
| • | Ignition in the ON or RUN position. |
| • | Headlamps ON. |
Conditions for Setting the DTC
B3410 01 or B3420 01
The headlamp control module detects a short to voltage or an open/high resistance on the 5-volt reference circuit.
B3410 02 or B3420 02
The headlamp control module detects a short to ground on the 5-volt reference circuit.
B3410 03 or B3420 03
The headlamp control module detects a short to ground or an open/high resistance on the sensor signal circuit.
B3410 07 or B3420 07
The headlamp control module detects a short to voltage on the 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 and the ignition is cycled. |
| • | A history DTC will clear once 50 consecutive malfunction-free cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
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
- Ignition OFF, disconnect the harness connector at the appropriate headlamp leveling sensor.
- Ignition OFF, test for less than 10.0 ohms between the low reference circuit terminal C and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
- Verify the appropriate scan tool Leveling Position Sensor parameter is less than 0.5 volt.
- Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal A. Verify the appropriate scan tool Leveling Position Sensor parameter is greater than 4.8 volts.
- If all circuits test normal, replace the appropriate headlamp leveling sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the headlamp control module. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the headlamp control module. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the headlamp control module. |
| ⇒ | If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the headlamp control module. |
| ⇒ | 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 headlamp control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for headlamp control module replacement, setup, and programming |
