Side Object Sensor Malfunction
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Side Object Sensor Malfunction
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Circuit/System Description
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The side blind zone alert system uses side object sensors located behind the rear fascia at each of the vehicle's rear corners. Visual indicators located in the right and left outside rearview mirrors alert the driver to the presence of objects of interest within the corresponding blind spots, or zones, on each side of the vehicle. The system is controlled by the Vehicle Personalization settings located in the radio.
Each sensor receives battery power, ground, as well as serial data communications. The left and right sensors are identical, however an additional ground circuit is required to configure the sensor for operation on the right side. Communication is via a serial data and each sensor shares the serial data circuit in parallel, allowing continuation of communication between the sensors. The scan tool is able to communicate with each sensor independently. The side object sensors control corresponding mirror icons by sending power to the individual LED indicators.
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The side object sensors are capable of detecting when they are blocked by mud, snow, or ice build up on the rear fascia. When a sensor is blocked, the driver information center will display SIDE BLIND ZONE SYSTEM UNAVAILABLE. The side blind zone alert system transitions back to the normal operating state when the blockage is removed. Bumper sticks, labels, and heavy rain storms may also cause this condition.
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The side blind zone alert system is designed to ignore stationary objects; however, the system may occasionally detect guard rails, signs, trees, shrubs, or other stationary objects as an object in the blind zone. This is normal system operation and does not require service.
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The side blind zone alert system may indicate an object in the blind zone if a trailer is attached to the vehicle, or a bicycle or object is extending out to either side of the vehicle.
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The side blind zone alert system is disabled if any of the following occurs:
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There is a loss of serial data communication or a side blind zone alert system DTC is set.
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The side blind zone alert system is manually disabled by the driver through the radio.
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Each side object sensor maintains a history buffer of the previous 16 side blind zone alert events which can be accessed using the scan tool. These parameters may be used to help diagnose a system malfunction or an intermittent concern.
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Because the sensors are identical, they may be swapped from one side of the vehicle to the other in an attempt to isolate a concern. Sensors should NOT be swapped from one vehicle to another.
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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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1.
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Ignition ON, verify the scan tool can communicate with left side object sensor.
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2.
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If the scan tool can not communicate with the left side object sensor, refer to Left Side Object Sensor Malfunction
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3.
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Verify the scan tool can communicate with right side object sensor.
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4.
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If the scan tool can not communicate with the right side object sensor, refer to Right Side Object Sensor Malfunction
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5.
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Ignition ON, verify that the side blind zone alert system indicators located in the outside rearview mirrors briefly turn ON and then turn OFF during the system self test.
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6.
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If both indicators do not briefly illuminate during the system self test, the side blind zone alert system has been disabled. Refer to Diagnostic Aids.
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7.
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If only one indicator does not briefly illuminate during the self test, refer to Side Object Indicator Malfunction.
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Left Side Object Sensor Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the B94L Side Object Sensor - Left.
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2.
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Test for less than 5 Ω between the ground circuit terminal 4 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 7 and ground.
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5.
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If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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6.
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If all circuits test normal, replace the B94L Side Object Sensor - Left.
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Right Side Object Sensor Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the B94R Side Object Sensor - Right.
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2.
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Test for less than 5 Ω between the ground circuit terminals listed below and ground:
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3.
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If greater than the specified value, test the appropriate ground circuit for an open circuit/high resistance.
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4.
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Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 7 and ground.
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5.
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If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
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6.
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Ignition OFF, disconnect the harness connector at the B94L Side Object Sensor - Left.
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7.
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Ignition ON, test for less than 0.3 V between the serial data circuit terminal 5 and ground.
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8.
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If greater than the specified value, test the serial data circuit for a short to voltage.
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9.
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Test for infinite resistance between the serial data circuit terminal 5 and ground.
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10.
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If not the specified value, test the serial data circuit for a short to ground.
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11.
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Test for less than 5 Ω between the serial data circuit terminal 5 at the B94L Side Object Sensor - Left harness connector and the serial data circuit terminal 5 at the B94R Side Object Sensor - Right harness connector.
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12.
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If the value is greater than the specified value, test the serial data circuit for an open circuit/high resistance.
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13.
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If all circuits test normal, replace the B94R Side Object Sensor - Right.
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Side Object Indicator Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the appropriate outside rearview mirror.
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2.
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Test for less than 5 Ω between the ground circuit terminal 12 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Connect a test lamp between the control circuit terminal 11 and the ground circuit terminal 12.
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5.
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Ignition ON, verify the test lamp briefly illuminates during the system self test.
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6.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the appropriate side object sensor.
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7.
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If the test lamp remains illuminated at all time, test the control circuit for a short to voltage. If the circuits test normal, replace the appropriate side object sensor.
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8.
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If all circuits test normal, replace the appropriate outside rearview mirror.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
