DTC B3410 or B3420
Diagnostic Instructions
DTC Descriptors
| DTC B3410 02: Automatic Headlamp Leveling
Control Module Front Axle Sensor Signal Circuit Short to
Ground |
| DTC B3410 05: Automatic Headlamp Leveling
Control Module Front Axle Sensor Signal Circuit High
Voltage/Open |
| DTC B3410 08: Automatic Headlamp Leveling
Control Module Front Axle Sensor Signal Circuit Performance -
Signal Invalid |
| DTC B3420 02: Automatic Headlamp Leveling
Control Module Rear Axle Sensor Signal Circuit Short to Ground |
| DTC B3420 05: Automatic Headlamp Leveling
Control Module Rear Axle Sensor Signal Circuit High
Voltage/Open |
| DTC B3420 08: Automatic Headlamp Leveling
Control Module Rear Axle Sensor Signal Circuit Performance - Signal
Invalid |
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 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
|
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 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
| • |
Battery voltage must be
between 9-16 V. |
| • |
The ignition is in the ON or
RUN position. |
Conditions for Setting the DTC
B3410 02 or B3420 02
The DTC will set when the headlamp control module detects no signal
and low voltage on the sensor signal line.
B3410 05 or B3420 05
The DTC will set when the headlamp control module detects no signal
and high voltage on the sensor signal line.
B3410 08 or B3420 08
The DTC will set when the headlamp control module detects sensor
frequency out of range or sensor signal implausible.
Action Taken When the DTC Sets
| • |
The headlamp control module
disables the headlamp leveling system. |
| • |
service head light leveling
indication ON. |
| • |
Advanced front lighting system
fault indication ON. |
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer
exists.
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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify that DTC B3415 is not present.
If DTC is present, refer to
DTC B3415 .
Circuit/System Testing
Note: Check for bulletins
before proceeding.
| 1. |
Ignition OFF, disconnect the
harness connector at the appropriate headlamp leveling
sensor. |
| 2. |
Disconnect the negative
terminal of the C1 Battery. |
| 3. |
Test for less than 5 Ω
between the low reference circuit terminal 1 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 K28 Headlamp Leveling Control Module. |
| 4. |
Reconnect the negative
terminal to the C1 Battery. |
| 5. |
Ignition ON, test for 4.8-5.2
V between the 5 V reference circuit terminal 3 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 K28 Headlamp Leveling
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 K28 Headlamp Leveling Control Module. |
| 6. |
Test for 4.8-5.2 V between the
signal circuit terminal 2 and ground. |
| ⇒ |
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. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. If the circuit tests normal,
replace the K28 Headlamp Leveling Control Module. |
| 7. |
Ignition OFF, connect the
harness connector to the appropriate headlamp leveling
sensor. |
| 8. |
Ignition ON, automatic light
ON. |
| 9. |
Move a piece of sheet metal in
the air gap between the appropriate headlamp leveling sensor and
the sensor metal plate. The value of the scan tool leveling sensor
parameter listed below should vary: |
| |
• |
Front Leveling Position Sensor
Signal |
| |
• |
Rear Leveling Position Sensor
Signal |
|
Note: When replacing
a headlamp leveling sensor it is necessary to carry out an
Automatic Headlamp Leveling Sensor Learn procedure.
|
| ⇒ |
If the appropriate value does not change, replace
the appropriate headlamp leveling sensor. |
| 10. |
Move a piece of sheet metal in
the air gap between the appropriate headlamp leveling sensor and
the sensor metal plate. The headlamps low beam should move up or
down. |
| ⇒ |
If the headlamps low beam does not move up or
down, replace the K28 Headlamp Leveling Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
