DTC B3435 or B3440
Diagnostic Instructions
DTC Descriptors
| DTC B3435 00: Automatic Headlamp Leveling
Control Module Left Servo Driver 1 or 2 Circuit Malfunction |
| DTC B3440 00: Automatic Headlamp Leveling
Control Module Right Servo Driver 1 or 2 Circuit Malfunction |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Ignition Left Headlamp
|
1
|
1
|
-
|
B3435 00
|
Ignition Right Headlamp
|
2
|
2
|
-
|
B3440 00
|
Left Headlamp Ground
|
-
|
1
|
-
|
B3435 00
|
Right Headlamp Ground
|
-
|
2
|
-
|
B3440 00
|
1. Left Headlamp Leveling Malfunction
2. Right Headlamp Leveling Malfunction
|
|
| |
Circuit/System Description
Battery positive voltage is applied to the headlamp control
module at all times. The headlamp control module has a normal
operational voltage range of about 12.5-16 V and is only fully
functional with the ignition switch is in the RUN position and the
headlamp switch in the AUTO position. The communications enable
signal from the body control module (BCM) wakes the headlamp
control module microprocessor. The headlamp control module receives
serial data messages from the engine control module, transmission
control module, electronic brake control module, and BCM with
information regarding power mode, speed, steering angle,
transmission gear selection, and headlamp switch status. The
headlamp control module calculates the headlamp angle and sends
commands to the left and right adaptive forward lighting system
headlamp actuators. The headlamp actuators drive the headlamps to
the position commanded by the headlamp control module. The headlamp
control module monitors the headlamp actuator motor control
circuits for proper circuit continuity and for shorts to ground or
voltage. If a malfunction is detected, a DTC will be stored in
memory and the driver will be notified with a message displayed
over the driver information center located on the instrument
cluster.
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
B3435 00 or B3440 00
The DTC will set when the headlamp control module detects no signal
and low voltage on the sensor signal line.
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
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 Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the appropriate headlamp assembly.
|
| 2. |
Disconnect the negative
terminal of the C1 Battery. |
| 3. |
Test for less than 5 Ω
between the ground circuit terminal 1, 8 and ground. |
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
| 4. |
Reconnect the negative
terminal to the C1 Battery. |
| 5. |
Ignition ON, headlamps ON,
connect a test lamp between the ignition circuit terminal 6 and
ground. The test lamp should illuminate. |
| ⇒ |
If the test lamp does not illuminate, test the
ignition circuit for a short to ground or an open/high
resistance. |
| 6. |
If all circuits test normal,
replace the appropriate headlamp assembly. Verify that the DTC do
not reset. |
| ⇒ |
If the DTC resets, replace the K28 Headlamp
Leveling Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
