Lane Departure Warning System Malfunction
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Lane Departure Warning System Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Lane Departure Warning Switch Ignition
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B0987 05
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B0987 05
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-
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-
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Lane Departure Warning Switch Signal
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B356A 02
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B356A 05
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B356A 05
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-
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Lane Departure Warning Switch Indicator Control
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-
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B0987 05
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B0987 05
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-
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Lane Departure Warning Switch Ground
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-
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B356A 05
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-
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-
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Circuit/System Description
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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 center console. 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.
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.
Schematic Reference
Object Detection Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Object Detection Description and Operation (Traffic Sign Assist)
Object Detection Description and Operation (Parking Assist with Parallel Parking)
Object Detection Description and Operation (Parking Assist)
Object Detection Description and Operation (Lane Departure Warning)
Object Detection Description and Operation (UFT)
Object Detection Description and Operation (UVC)
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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Note
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Refer to Diagnostic Aids before performing Circuit/System Verification.
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1.
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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.
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2.
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If the parameter does not change between the specified values, refer to Lane Departure Warning Switch Circuit Malfunction.
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3.
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Observe the mode LED while cycling the lane departure warning switch. The LED should turn ON and OFF when cycling between the commanded states.
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4.
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If the LED does not turn ON and OFF, refer to Lane Departure Warning Switch LED Circuit Malfunction.
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5.
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Inspect the lens of the vehicle direction camera control module for contamination.
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Lane Departure Warning Switch Circuit Malfunction
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1.
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Ignition OFF, remove the ignition key, open the driver door and disconnect the scan tool.
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2.
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Disconnect the harness connector at the S48E Multifunction Switch - Center Console.
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3.
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Test for less than 10 Ω between the S48E Multifunction Switch - Center Console ground circuit terminal 2 and ground.
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4.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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5.
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Ignition ON, verify the scan tool Vehicle Direction Camera Switch Status parameter is Open.
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6.
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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.
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7.
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Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground circuit terminal 2. Verify the scan tool Vehicle Direction Camera Switch Status parameter is Closed.
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8.
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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.
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9.
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If all circuits test normal, replace the S48E Multifunction Switch - Center Console.
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Lane Departure Warning Switch LED Circuit Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the K74 Vehicle Direction Camera Control Module.
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2.
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Ignition ON, observe the lane departure warning switch indicator. The indicator should be OFF.
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3.
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If the indicator remains illuminated, test to see if there is a short circuit to ground in control circuit terminal 4. If the circuit tests normal, replace the S48E multifunction switch - center console.
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4.
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Ignition OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console.
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5.
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Ignition ON, test for greater than 11 V between the ignition circuit terminal 3 at the S48E Multifunction Switch - Center Console harness connector and ground.
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6.
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If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance.
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7.
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Ignition OFF, connect the harness connector at the S48E Multifunction Switch - Center Console.
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8.
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Install a 3 A fused jumper wire between the control circuit terminal 4 and ground. The indicator should be ON.
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9.
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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 S48E Multifunction Switch - Center Console.
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10.
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If all circuits test normal, replace the K74 Vehicle Direction Camera Control Module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
