Lane Departure Warning System Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Lane Departure Warning Switch Ignition
|
B0987 05
|
B0987 05
|
-
|
-
|
Lane Departure Warning Switch Signal
|
B356A 02
|
B356A 05
|
B356A 05
|
-
|
Lane Departure Warning Switch Indicator Control
|
-
|
B0987 05
|
B0987 05
|
-
|
Lane Departure Warning Switch Ground
|
-
|
B356A 05
|
-
|
-
|
|
| |
Circuit/System Description
The lane departure warning system is controlled by the vehicle
direction camera control module mounted on the windshield. The lane
departure warning is enabled and disabled through a switch located
in the multifunction switch at the instrument panel. When enabled,
the vehicle direction camera control module will illuminate the
indicator located in the switch.
When the system is operating and can detect the lane markings,
the vehicle direction camera control module will request via serial
data communications that the instrument cluster illuminate the
green lane departure ready-to-assist indicator. If the vehicle
direction camera control module detects that the vehicle has
crosses a lane marking without the turn signal being used, the
module will request that the instrument cluster flash the yellow
lane departure warning indicator. An audible warning will also
sound three times when the yellow instrument cluster indicator is
flashing.
Diagnostic Aids
Certain factors will affect the operation of the lane departure
warning system. When the system is operating properly, the green
lane departure indicator will illuminate on the instrument cluster.
This indicates that all of the required operating conditions to
permit lane departure warning have been met. The green lane
departure indicator will not appear when the system is having
difficulty seeing the lines on the road or if the view of the
camera on the windshield is blocked with mud, dirt, snow, ice, or
slush, if the windshield is damaged, or when weather limits
visibility, such as while driving in fog, rain, or snow conditions.
This is normal operation, the vehicle does not need service.
Additionally, lane departure warnings may occasionally occur in a
properly operating vehicle due to tar marks, shadows, cracks in the
road, or other road imperfections. This is normal system operation
and the vehicle does not require service. The driver information
center may also display LANE DEPARTURE SYSTEM UNAVAILABLE due to
the temporary conditions listed above.
Reference Information
Schematic Reference
Object Detection Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Object Detection Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Note: Refer to Diagnostic
Aids before performing Circuit/System Verification.
| 1. |
Observe the scan tool Vehicle
Direction Camera Switch Status parameter while pressing the lane
departure warning switch. The parameter should change between Open
and Closed. |
| ⇒ |
If the parameter does not change between the
specified values, refer to Lane Departure Warning Switch Circuit
Malfunction. |
| 2. |
Observe the mode LED while
cycling the lane departure warning switch. The LED should turn ON
and OFF when cycling between the commanded states. |
| ⇒ |
If the LED does not turn ON and OFF, refer to Lane
Departure Warning Switch LED Circuit Malfunction. |
| 3. |
Inspect the lens of the
vehicle direction camera control module for contamination.
|
Circuit/System Testing
Lane Departure Warning Switch Circuit Malfunction
| 1. |
Ignition OFF, remove the
ignition key, open the driver door and disconnect the scan
tool. |
| 2. |
Disconnect the harness
connector at the S48D Multifunction Switch 2 - Instrument
Panel. |
| 3. |
Test for less than 5 Ω
between the S48D Multifunction Switch 2 - Instrument Panel ground
circuit terminal 2 and ground. |
| ⇒ |
If greater than the specified value, test the
ground circuit for an open/high resistance. |
| 4. |
Ignition ON, verify the scan
tool Vehicle Direction Camera Switch Status parameter is
Open. |
| ⇒ |
If not the specified value, test the signal
circuit terminal 7 for a short to ground. If the circuit tests
normal, replace the K74 Vehicle Direction Camera Control
Module. |
| 5. |
Install a 3 A fused jumper
wire between the signal circuit terminal 7 and ground circuit
terminal 2. Verify within 20 s the scan tool Vehicle Direction
Camera Switch Status parameter is Closed. |
| ⇒ |
If not the specified value, test the signal
circuit terminal for a short to battery or an open/high resistance.
If the circuit tests normal, replace the K74 Vehicle Direction
Camera Control Module. |
| 6. |
If all circuits test normal,
replace the S48D Multifunction Switch 2 - Instrument Panel.
|
Lane Departure Warning Switch LED Circuit Malfunction
| 1. |
Ignition OFF, disconnect the
harness connector at the K74 Vehicle Direction Camera Control
Module. |
| 2. |
Ignition ON, observe the lane
departure warning switch indicator. The indicator should be
OFF. |
| ⇒ |
If the indicator is always ON, test the control
circuit terminal 4 for a short to ground. If the circuit tests
normal, replace the S48D Multifunction Switch 2 - Instrument
Panel. |
| 3. |
Ignition OFF, disconnect the
harness connector at the S48D Multifunction Switch 2 - Instrument
Panel. |
| 4. |
Ignition ON, test for greater
than 11 V between the ignition circuit terminal 3 at the S48D
Multifunction Switch 2 - Instrument Panel harness connector and
ground. |
| ⇒ |
If less than the specified value, test the
ignition circuit for a short to ground or an open/high
resistance. |
| 5. |
Ignition OFF, connect the
harness connector at the S48D Multifunction Switch 2 - Instrument
Panel. |
| 6. |
Install a 3 A fused jumper
wire between the control circuit terminal 4 and ground. The
indicator should be ON. |
| ⇒ |
If the indicator is always OFF, test the control
circuit terminal 4 for a short to battery or an open/high
resistance. If the circuit tests normal, replace the S48D
Multifunction Switch 2 - Instrument Panel. |
| 7. |
If all circuits test normal,
replace the K74 Vehicle Direction Camera Control Module.
|
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
