Headlamp Leveling Malfunction (T95 T4F TR7)
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Ignition Left Headlamp
|
2
|
2
|
-
|
B1461 00
|
Ignition Right Headlamp
|
3
|
3
|
-
|
B1462 00
|
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
|
-
|
-
|
Headlamp Leveling Sensor Low Reference - Rear
|
-
|
1
|
-
|
-
|
Left Headlamp Ground
|
-
|
2
|
-
|
B1461 00
|
Right Headlamp Ground
|
-
|
3
|
-
|
B1462 00
|
1. All headlamp leveling actuator malfunction
2. Left headlamp leveling actuator malfunction
3. Right headlamp leveling actuator 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 AUTOMATIC LIGHT 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 (ECM),
transmission control module (TCM), electronic brake control module
(EBCM), 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.
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 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 customer
concern is not still present. |
| ⇒ |
If the customer concern is still present, replace
the K28 Headlamp Leveling Control Module. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
