Home ReviewsRefund
Home/Chevrolet/Cab & Chassis Silverado 3500 HD/Chevrolet Cab & Chassis Silverado 3500 HD (2008-2011)/Repair manual/Collision/avoidance/Object Detection System
Contents Wiring diagrams Section: Collision/avoidance All sections

Object Detection System Chevrolet Cab & Chassis Silverado 3500 HD

Collision/avoidance 7 illustrations ~8277 words

Scheme 1

Scheme 1: Object Detection Schematics
Scheme 1: Object Detection Schematics

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

DIAGNOSTIC CODE INDEX

DTCDescription
DTC B0958, B0959, B0960, or B0961B0958 01: Parking Aid Rear Sensor 1 Circuit Short to Battery-Left Corner B0958 06: Parking Aid Rear Sensor 1 Circuit Short to Ground or Open-Left Corner B0958 08: Parking Aid Rear Sensor 1 Circuit Signal Invalid-Left Corner B0958 21: Parking Aid Rear Sensor 1 Circuit Incorrect Period-Left Corner B0959 01: Parking Aid Rear Sensor 2 Circuit Short to Battery-Left Middle B0959 06: Parking Aid Rear Sensor 2 Circuit Short to Ground or Open-Left Middle B0959 08: Parking Aid Rear Sensor 2 Circuit Signal Invalid-Left Middle B0959 21: Parking Aid Rear Sensor 2 Circuit Incorrect Period-Left Middle B0960 01: Parking Aid Rear Sensor 3 Circuit Short to Battery-Right Middle B0960 06: Parking Aid Rear Sensor 3 Circuit Short to Ground or Open-Right Middle B0960 08: Parking Aid Rear Sensor 3 Circuit Signal Invalid-Right Middle B0960 21: Parking Aid Rear Sensor 3 Circuit Incorrect Period-Right Middle B0961 01: Parking Aid Rear Sensor 4 Circuit Short to Battery-Right Corner B0961 06: Parking Aid Rear Sensor 4 Circuit Short to Ground or Open-Right Corner B0961 08: Parking Aid Rear Sensor 4 Circuit Signal Invalid-Right Corner B0961 21: Parking Aid Rear Sensor 4 Circuit Incorrect Period-Right Corner
DTC B0967B0967 02: Parking Aid Switch Circuit Short to Ground
DTC B0968B0968 00: Parking Aid Indicator Circuit
DTC B1008B1008 42: Calibration Data Not Programmed Calibration Data Set Not Programmed
DTC B1015B1015 00: Vehicle Identification Number (VIN) Information Error
DTC B1E3AB1E3A 03: Sensor Power Circuit Voltage Below Threshold B1E3A 07: Sensor Power Circuit Voltage Above Threshold

OBJECT DETECTION DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Object Detection

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information

  1. The identification of the control modules which command the system
  2. The ability of the control modules to communicate through the serial data circuit
  3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using the diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
8-Volt ReferenceB0958 06, B0959 06, B0960 06, B0961 06, B1E3A 03B0958 06, B0959 06, B0960 06, B0961 06B1E3A 07
Left Rear Object Sensor SignalB0958 06B0958 06B0958 01B0958 08, B0958 21
Left Middle Rear Object Sensor SignalB0959 06B0959 06B0959 01B0959 08, B0959 21
Right Middle Rear Object Sensor SignalB0960 06B0960 06B0960 01B0960 08, B0960 21
Right Rear Object Sensor SignalB0961 06B0961 06B0961 01B0961 08, B0961 21
Low ReferenceB0958 01, B0959 01, B0960 01, B0961 01, B0958 06, B0959 06, B0960 06, B0961 06

Circuit/System Description

The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The object alarm module supplies 8 volts to the object sensors via the 8 volt reference circuit and provides ground via the low reference circuit. The object alarm module triggers the sensors in a sequential loop. After each sensor transmits, the object alarm module uses the sensor ring received through the signal circuit to calculate the distance and position of an object.

Conditions for Running the DTC

  1. DTC B1325 is not set
  2. Ignition voltage is between 9-16 volts
  3. The vehicle is in REVERSE

B0958 01, B0959 01, B0960 01, or B0961 01

Voltage seen on the object sensor signal circuit is greater than 11.5 volts or the object sensor is not grounded.

B0958 06, B0959 06, B0960 06, or B0961 06

Voltage seen on the object sensor signal circuit is less than 0.5 volts.

B0958 08, B0959 08, B0960 08, or B0961 08

An invalid signal is received by the object alarm module.

B0958 21, B0959 21, B0960 21, or B0961 21

The object sensor determines no change in the position of an object while the vehicle is in motion.

Action Taken When the DTC Sets

  1. Parking assist is disabled.
  2. The object alarm module commands the red indicator ON.
  3. The object alarm module sends a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC) and a chime will sound.

Conditions for Clearing the DTC

  1. The DTC will transition to history when the fault is no longer present.
  2. A history DTC will clear after 100 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  3. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)
  4. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Verify that DTC B1E3A is not set. If DTC is set, refer to «DTC B1E3A»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .
  2. Park brake OFF, transmission in REVERSE, individually place a suitable object behind each sensor. Verify the appropriate scan tool Rear Region parameter is between Zone 1 and Zone 4.

Circuit/System Testing

Single Object Sensor DTC Set

  1. Ignition OFF, disconnect the harness connector at the appropriate object sensor.
  2. Ignition OFF for 30 seconds, test for less than 20 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the object alarm module.
  3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 volts between the voltage reference circuit terminal 1 and ground. If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object alarm module. If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.
  4. Ignition OFF, remove the malfunctioning object sensor and swap locations with another properly functioning rear object sensor. Connect the harness connector at both sensors.
  5. Ignition ON, verify the DTC is set for the new location in which the malfunctioning sensor is installed. If the DTC does not set for the new location, test the signal circuit terminal 3 for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the object alarm module.
  6. If the DTC sets for the new location in which the malfunctioning sensor is installed, replace the appropriate rear object sensor.

Multiple Object Sensor DTCs Set

  1. Ignition OFF, disconnect the harness connector at each of the object sensors.
  2. Ignition OFF for 30 seconds, test for less than 20 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the object alarm module.
  3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 volts between the voltage reference circuit terminal 1 and ground. If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object alarm module. If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Rear Object Sensor Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for object alarm module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Parking Assist Disable SignalB9067 0211
I/P Multifunction Switch Assembly Ground11
1. Parking Assist Disable Switch Inoperative

The parking assist system can be disabled by pressing the parking assist disable switch. When pressed, the parking assist disable signal circuit is pulled to ground. When the parking assist system is disabled, the rear object sensor control module will also ground the parking assist disable indicator control circuit, illuminating the indicator.

  1. DTC B1325 is not set
  2. Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The rear object sensor control module has detected that the parking assist disable switch signal circuit is shorted to ground.

  1. The parking assist system defaults to the enabled state.
  2. The parking assist disable indicator is not illuminated.

Conditions for Clearing

  1. The DTC will transition to history when the fault is no longer present.
  2. A history DTC will clear after 100 malfunction-free ignition cycles.

Diagnostic Aids

If the parking aid switch is continuously pressed for greater than 5 seconds the DTC will set.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Park Assist Switch parameter while cycling the parking assist disable switch. The parameter should change between Active and Inactive.

  1. Ignition OFF, disconnect the harness connector at the I/P multifunction switch assembly.
  2. Test for less than 1.0 ohm between the ground circuit terminal 3 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that the scan tool Park Assist Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the rear object sensor control module.
  4. Ignition OFF, connect a 3A fused jumper wire between signal circuit terminal 2 and ground.
  5. Ignition ON, verify that the scan tool Park Assist Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the rear object sensor control module.
  6. If all circuits test normal, test or replace the I/P accessory switch assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Accessory Switch Replacement (with RPO SLT)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gages) or «Accessory Switch Replacement (without RPO SLT)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gages)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for object alarm module replacement, setup, and programming.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Telltale Assembly Supply VoltageB0968 001, 2, 3
Amber 1 Indicator ControlB0968 0011
Amber 2 Indicator ControlB0968 0022
Red Indicator ControlB0968 0033
1. Amber 1 LED Malfunction 2. Amber 2 LED Malfunction 3. Red LED Malfunction

The object alarm module directly controls the parking assist indicators located in the information center telltale assembly. The information center telltale assembly consists of two amber and one red LED that indicate the distance of an object from the rear bumper. As objects become progressively closer to the bumper, the object alarm module will illuminate the LEDs in a sequence: one amber LED, both amber LEDs, and lastly, both amber LEDs and the red LED. The LEDs are supplied voltage by the object alarm module. Each LED is also discretely controlled by the object alarm module.

  1. DTC B1325 is not set
  2. Ignition voltage is between 9-16 volts

The object alarm module detects that one of the three indicator control circuits or the supply voltage is shorted to ground.

  1. Parking assist is disabled.
  2. The object alarm module commands the red indicator ON.
  3. The object alarm module sends a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC) and a chime will sound.
  1. The DTC will transition to history when the fault is no longer present.
  2. A history DTC will clear after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the Rear Red LED, Rear Yellow LED 1, and Rear Yellow LED 2 ON and OFF with a scan tool. The appropriate indicator should turn on and off as commanded.

  1. Ignition OFF, disconnect the harness connector at the information center telltale assembly.
  2. Ignition ON, test for 9.0-12.5 V between the supply voltage circuit terminal A and ground. If less than the specified range, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module. If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
  3. Test for less than 0.3 V between the appropriate control circuit listed below and ground: Amber 1 LED - terminal B Amber 2 LED - terminal C Red LED - terminal D If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
  4. Ignition OFF, test for infinite resistance between the appropriate control circuit listed below and ground: Amber 1 LED - terminal B Amber 2 LED - terminal C Red LED - terminal D If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the object alarm module.
  5. Ignition ON, command the appropriate LED ON with a scan tool and test for less than 10 ohms between the appropriate control circuit listed below and ground: Amber 1 LED - terminal B Amber 2 LED - terminal C Red LED - terminal D If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, replace the object alarm module.
  6. If all circuits test normal, test or replace the information center telltale assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Information Center Telltale Assembly Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for object alarm module replacement, setup, and programming.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition is turned ON, the object alarm module performs a self-test to verify if any critical malfunction exists within the system. During the power-up mode, the object alarm module checks for a valid calibration data set.

  1. DTC B1325 is not set
  2. Ignition voltage is between 9-16 volts

A valid calibration is not detected upon module power-up.

  1. Parking assist is disabled.
  2. The object alarm module commands the red indicator ON.
  3. The object alarm module sends a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC) and a chime will sound.
  1. The DTC will transition to history when the fault is no longer present.
  2. A history DTC will clear after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC B1008 is not set.

  1. If the DTC is set, program the object alarm module. Refer to «Object Alarm Module Programming and Setup»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__object-alarm-module-programming-and-setup) . If the DTC resets, replace the object alarm module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for object alarm module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition is turned ON, the object alarm module receives the vehicle identification number (VIN) from the body control module (BCM). The object alarm module will compare the VIN received to the VIN stored in memory.

  1. DTC B1325 is not set
  2. Ignition voltage is between 9-16 volts

The VIN stored in the object alarm module does not match the received VIN.

  1. Parking assist is disabled.
  2. The object alarm module commands the red indicator ON.
  3. The object alarm module sends a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC) and a chime will sound.
  1. The DTC will transition to history when the fault is no longer present.
  2. A history DTC will clear after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC B1015 is not set.

  1. If the DTC is set, program the object alarm module. Refer to «Object Alarm Module Programming and Setup»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__object-alarm-module-programming-and-setup) . If the DTC resets, replace the object alarm module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for object alarm module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
8-Volt ReferenceB0958 06, B0959 06, B0960 06, B0961 06, B1E3A 03B0958 06, B0959 06, B0960 06, B0961 06B1E3A 07
Left Rear Object Sensor SignalB0958 06B0958 06B0958 01B0958 08, B0958 21
Left Middle Rear Object Sensor SignalB0959 06B0959 06B0959 01B0959 08, B0959 21
Right Middle Rear Object Sensor SignalB0960 06B0960 06B0960 01B0960 08, B0960 21
Right Rear Object Sensor SignalB0961 06B0961 06B0961 01B0960 08, B0960 21
Low ReferenceB0958 06, B0959 06, B0960 06, B0961 06

The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The object alarm module supplies 8 volts to the object sensors via the 8 volt reference circuit and provides ground via the low reference circuit. The object alarm module triggers the sensors in a sequential loop. After each sensor transmits, the object alarm module uses the sensor ring received through the signal circuit to calculate the distance and position of an object.

  1. DTC B1325 is not set
  2. Ignition voltage is between 9-16 volts
  3. The vehicle is in REVERSE

B1E3A 03

The object alarm module has detected the 8-volt reference circuit is less than 7.2 volts.

B1E3A 07

The object alarm module has detected the 8-volt reference circuit is greater than 9.2 volts.

  1. Parking assist is disabled.
  2. The object alarm module commands the red indicator ON.
  3. The object alarm module sends a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC) and a chime will sound.
  1. The DTC will transition to history when the fault is no longer present.
  2. A history DTC will clear after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, transmission in REVERSE, verify that the scan tool Sensor Voltage Feed Output parameter is 7.2-9.2 volts.

  1. Ignition OFF, disconnect the harness connector at each of the object sensors.
  2. Ignition ON, verify DTC B1E3A is not set as current. If the DTC is set, test the 8-volt reference circuit terminal 1 for a short to voltage, short to ground, or an open/high resistance. If circuit tests normal, replace the object alarm module.
  3. Install each sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1E3A is not set as current. If the DTC is set, replace the object sensor that was connected immediately before the DTC set.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Rear Object Sensor Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for object alarm module replacement, setup, and programming.

Symptoms - Object Detection

Note. Review the system operation in order to familiarize yourself with the system functions. Refer to Object Detection Description and Operation (UVC) or Object Detection Description and Operation (UD7) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  3. Make sure the rear parking assist sensors located on the vehicle rear bumper are clear. Remove any snow, mud or ice that is blocking the sensors.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

  1. «Parking Assist System Malfunction»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  2. «Parking Assist Indicator Malfunction»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  3. «Rear Vision Camera System Malfunction (with UVB)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) or «Rear Vision Camera System Malfunction (without UVB)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The parking assist system is designed to identify and notify the driver of an object in the vehicle's path when reversing at speeds of less than 8 km/h (5 mph). The distance and location of the object is determined by four object sensors located in the rear bumper. The parking assist system will notify the driver using the parking assist indicators and an audible signal through the radio.

The scan tool Park Assist Disable History parameters are a list of the seven previous reasons the park assist system was disabled. These parameters may help in the diagnosis of an intermittent concern or a customer concern which is the result of normal system operation. The following is a brief description of potential causes which may aid in diagnosis

  1. Manual Disable - The park assist system has been disabled by the vehicle operator using the parking assist disable switch.
  2. Park Brake - The vehicle parking brake is applied or a malfunction exists within the parking brake system.
  3. Hitch/Object Attached - The object alarm module is detecting an object that is attached to the vehicle or the endgate is lowered, if applicable. Common items such as a hitch receiver, trailer, object hanging out of endgate, or a bicycle rack may cause this concern. Additionally, damage to the rear of the vehicle or a misaligned sensor may cause this concern. If the vehicle is damaged in a manner that causes the sensor to detect the bumper itself, the object alarm module will interpret this as an attached object and disable the system. Carefully inspect the bumper, bumper mounting surface, and sensor retainers before continuing with normal diagnosis. After the detected cause has been addressed the vehicle must be driven at speed greater than 40 km/h (25 mph).
  4. Reverse Overspeed - The vehicle is traveling too fast in reverse at speeds of greater than 8 km/h (5 mph).
  5. Inhibit - The object alarm module has lost or received invalid GMLAN signal(s).
  6. Sensor Disturbance - An outside interference is causing sensor movement. Such interference may be caused by a heavy pounding, like that of a nearby jackhammer, or large changes in pressure, such as a large truck's air brakes.
  7. Sensor Ring Time - If the sensor fails its own diagnostic initialization the object alarm module will set this error. After the detected cause has been addressed the vehicle must be driven at speed greater than 40 km/h (25 mph). The following is a list of reasons this cause may have set: - One or more of the sensors may be blocked by snow, mud, ice, or other debris. This might happen after going through a car wash in cold weather. - Silicone insulator surrounding sensor maybe missing, cut, or twisted. - Improperly installed sensor, sensor maybe be crooked due to a tight wire harness. - One or more of the sensors may be scratched or the paint maybe chipped. - Excessive paint thickness on a sensor may cause an excessive sensor ring time. When replacing or refinishing a sensor, do not apply an excessive amount of paint or clear coat.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, verify the park assist system is enabled through the DIC. If the park assist system is manually disabled, enable the system. Refer to the vehicle owners manual for instructions on enabling the system.
  2. Observe the scan tool Park Assist Switch parameter while pressing and releasing the park assist disable switch. The parameter should change between Active and Inactive. If the parameter does not cycle between the specified values, refer to Park Assist Disable Switch Circuit Malfunction under «Circuit/System Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .
  3. Observe the scan tool Park Assist Switch LED parameter while pressing and releasing the park assist disable switch. The parameter should change between On and Off. If the parameter does not cycle between the specified values, refer to Park Assist Disable LED Circuit Malfunction under «Circuit/System Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .
  4. Command each of the park assist indicator LEDs ON and OFF with a scan tool. Each of the LEDs should turn ON and OFF as commanded. If any of the LEDs do not turn ON and OFF, refer to «Parking Assist Indicator Malfunction»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .
  5. Ignition ON, vehicle in reverse, verify the scan tool Park Assist System Status parameter is Enable. IMPORTANT: After completing the next step the vehicle might need to be driven in the forward direction at speed greater than 40 km/h (25 mph). If not the specified value, refer to «Diagnostic Aids»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) and the scan tool Park Assist Disable History parameters to determine the cause of the inhibit.

Park Assist Disable Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector I/P multifunction switch.
  2. Test for less than 10 ohms between the ground circuit terminal 3 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Park Assist Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the object alarm module.
  4. Install a 3A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Park Assist Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the object alarm module.
  5. If all circuits test normal, test or replace the I/P multifunction switch.

Park Assist Disable LED Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector I/P multifunction switch.
  2. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 6 and ground: If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the harness connector at the I/P multifunction switch assembly. Disconnect the X2 harness connector at the object alarm module.
  4. Ignition ON, verify the park assist disable LED is not illuminate. If the LED is illuminated, test the control circuit for a short to ground. If the circuit tests normal, test or replace the I/P multifunction switch.
  5. Install a 10A fused jumper wire between the control circuit terminal 3 and ground. Verify the park assist disable LED is illuminated. If the LED is not illuminated, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the I/P multifunction switch.
  6. If all circuits test normal, replace the object alarm module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Accessory Switch Replacement (with RPO SLT)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gages) or «Accessory Switch Replacement (without RPO SLT)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/gauges-instrument-panels/#instrument-panel-system-displays-gages)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for object alarm module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The parking assist indicator is located in the interior rear of the vehicle as part of the information center telltale assembly. The indicator contains three LEDs: two amber and one red. The object alarm module controls these three LEDs as a visual indicator of how close the vehicle bumper is to an object. The object alarm module supplies voltage to each of the LEDs and commands each LED on by supplying an individual ground.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, perform the scan tool LED Test. Each of the three LEDs should illuminate during the test cycle.

  1. Ignition OFF, disconnect the harness connector at the information center telltale assembly.
  2. Ignition ON, test for 9.0-12.5 V between the supply voltage circuit terminal A and ground. If less than the specified range, test the supply voltage circuit terminal for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module. If greater than the specified range, test the supply voltage circuit terminal for a short to voltage. If the circuit tests normal, replace the object alarm module.
  3. Test for less than 0.3 V between the appropriate control circuit listed below and ground: Amber 1 LED - terminal B Amber 2 LED - terminal C Red LED - terminal D If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
  4. Ignition OFF, test for infinite resistance between the appropriate control circuit listed below and ground: Amber 1 LED - terminal B Amber 2 LED - terminal C Red LED - terminal D If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the object alarm module.
  5. Ignition ON, command the appropriate LED ON with a scan tool and test for less than 10 ohms between the appropriate control circuit listed below and ground: Amber 1 LED - terminal B Amber 2 LED - terminal C Red LED - terminal D If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, replace the object alarm module.
  6. If all circuits test normal, test or replace the information center telltale assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Information Center Telltale Assembly Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for the object alarm module replacement, setup, and programming.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the transmission is placed into REVERSE, a 12 V signal is sent to the rearview camera indicating that camera operation is requested. Ignition voltage and ground are supplied to the rearview camera. The rearview camera sends video information to the radio through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.

A poor video image can be caused by ice, snow, and mud buildup on the lens of the rearview camera. Also, extreme lighting conditions can affect performance, such as operating in the dark or with bright sunlight shining on the camera. Extreme high or low temperatures can also affect the image quality.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Inspect the rearview camera and verify there are no debris on the lens and that the bezel or bezel seal is not damaged. If debris are found on the lens, clean the lens. If the lens, bezel, or bezel seal are damaged, replace as necessary.
  2. Ignition ON, vehicle in PARK, verify the backup lamps are off. If the backup lamps are illuminated, refer to Rearview Camera System Always On under «Circuit/System Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .
  3. Vehicle in REVERSE, verify a clear rear vision image is displayed on the radio. If a clear image is not displayed, refer to Rearview Camera System Does Not Display under «Circuit/System Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .

Rearview Camera System Always On

  1. Ignition OFF, disconnect the harness connector at the rearview camera.
  2. Ignition ON, vehicle in PARK, verify a test lamp does not illuminate between the control circuit terminal 3 and ground. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, refer to «Backup Lamps Malfunction (Automatic Transmission)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-lights/#lighting-systems) or «Backup Lamps Malfunction (Manual Transmission)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-lights/#lighting-systems) .
  3. If all circuits test normal, test or replace the rearview camera.

Rearview Camera System Does Not Display

  1. Ignition OFF, disconnect the harness connector at the rearview camera.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 6 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Park brake applied, transmission in REVERSE, test for B+ between the B+ circuit terminal 3 and ground. If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, disconnect the X4 harness connector at the radio.
  6. Ignition ON, test for less than 1 V between the following signal circuit terminals at the rearview camera harness connector and ground: Signal (+) circuit terminal 1 Signal (-) circuit terminal 4 If greater than the specified range, test the signal circuit for a short to voltage.
  7. Test for infinite resistance between the following circuit terminals at the rearview camera harness connector and ground: Signal (+) circuit terminal 1 Signal (-) circuit terminal 4 If not the specified value, test the circuit for a short to ground.
  8. Test for less than 10 ohms between the shield ground circuit terminal 2 and ground. If greater than the specified range, test the shield ground circuit for an open/high resistance.
  9. Test for less than 2 ohms between the signal (+) circuit terminal 1 at the rearview camera harness connector and the signal (+) circuit terminal 6 at the radio harness connector If greater than the specified range, test the signal circuit for an open/high resistance.
  10. Test for less than 2 ohms between the signal (-) circuit terminal 4 at the rearview camera harness connector and the signal (-) circuit terminal 7 at the radio harness connector. If greater than the specified range, test the signal circuit for an open/high resistance.
  11. If all circuits test normal, test or replace the rearview camera.
  12. Ignition ON, transmission in REVERSE, verify a clear rear vision image is displayed on the radio. If a clear rear vision image is not displayed, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Rearview Camera Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-system-check-vehicle) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the transmission is placed into REVERSE, a 12 V signal is sent to the inside rearview mirror and rearview camera indicating that camera operation is requested. Ignition voltage and ground are supplied to the rearview camera; the inside rearview mirror is supplied a common ignition voltage and ground source that is shared with other mirror operations. The rearview camera sends video information to the inside rearview mirror through a video signal + and a video signal - circuit. A grounded shielding also wraps the video signal circuits to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.

A poor video image can be caused by ice, snow, and mud buildup on the lens of the rearview camera. Also, extreme lighting conditions can affect performance, such as operating in the dark or with bright sunlight shining on the camera. Extreme high or low temperatures can also affect the image quality.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)
  1. Inspect the rearview camera and verify there are no debris on the lens and that the bezel or bezel seal is not damaged. If debris are found on the lens, clean the lens. If the lens, bezel, or bezel seal are damaged, replace as necessary.
  2. Engine running, vehicle in PARK, verify the backup lamps are off. If the backup lamps are illuminated, refer to Rearview Camera System Always On under «Circuit/System Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .
  3. Park brake applied, transmission in REVERSE, verify a clear rear vision image is displayed on the inside rearview mirror. If a clear image is not displayed, refer to Rearview Camera System Does Not Display under «Circuit/System Testing»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system) .

Rearview Camera System Always On

  1. Ignition OFF, disconnect the harness connector at the rearview camera.
  2. Engine running, transmission in PARK, verify a test lamp does not illuminate between the control circuit terminal 3 and ground. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, refer to «Backup Lamps Malfunction (Automatic Transmission)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-lights/#lighting-systems) or «Backup Lamps Malfunction (Manual Transmission)»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-lights/#lighting-systems) .
  3. If all circuits test normal, test or replace the rearview camera.

Rearview Camera System Does Not Display

  1. Ignition OFF, disconnect the harness connector at the rearview camera.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Engine running, verify a test lamp illuminates between the ignition circuit terminal 6 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Park brake applied, transmission in REVERSE, test for B+ between the B+ circuit terminal 3 and ground. If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  6. Engine running, test for less than 1 V between the following signal circuit terminals at the rearview camera harness connector and ground: Signal (+) circuit terminal 1 Signal (-) circuit terminal 4 If greater than the specified range, test the signal circuit for a short to voltage.
  7. Test for infinite resistance between the following circuit terminals at the rearview camera harness connector and ground: Signal (+) circuit terminal 1 Signal (-) circuit terminal 4 If not the specified value, test the circuit for a short to ground.
  8. Test for less than 10 ohms between the shield ground circuit terminal 2 and ground. If greater than the specified range, test the shield ground circuit for an open/high resistance.
  9. Test for less than 2 ohms between the signal (+) circuit terminal 1 at the rearview camera harness connector and the signal (+) circuit terminal 6 at the inside rearview mirror harness connector. If greater than the specified range, test the signal circuit for an open/high resistance.
  10. Test for less than 2 ohms between the signal (-) circuit terminal 4 at the rearview camera harness connector and the signal (-) circuit terminal 7 at the inside rearview mirror harness connector. If greater than the specified range, test the signal circuit for an open/high resistance.
  11. If all circuits test normal, test or replace the rearview camera.
  12. Engine running, transmission in REVERSE, verify a clear rear vision image is displayed on the inside rearview mirror. If a clear rear vision image is not displayed, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Rearview Camera Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/collisionavoidance/#object-detection-system)
  2. «Control Module References»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for inside rearview mirror replacement, setup, and programming

Scheme 4

Scheme 4: Rear Object Alarm Module Replacement
Scheme 4: Rear Object Alarm Module Replacement
CalloutComponent Name
Preliminary Procedure: Remove the front passenger bucket seat. Refer to Front Seat Replacement - Bucket .
1Rear Object Alarm Module Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
2Rear Object Alarm Module Assembly Procedure Position carpet in order to access module. Disconnect electrical connector. Reprogram the module after replacement. Refer to Control Module References
CAUTION
Refer to Fastener Caution .

Scheme 5

Scheme 5: Information Center Telltale Assembly Replacement
Scheme 5: Information Center Telltale Assembly Replacement
CalloutComponent Name
1Center Pillar Upper Garnish Molding Refer to Center Pillar Upper Garnish Molding Replacement .
2Information Center Telltale Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
3Information Center Telltale Assembly Tip: Disconnect the electrical connector.
CAUTION
Refer to Fastener Caution .

Removal Procedure

  1. Disconnect electrical from the rear object sensor.
  2. Lift the locking tabs on the housing and remove the rear object sensor.

Installation Procedure

  1. Paint the rear object sensor. Refer to «Basecoat/Clearcoat Paint Systems»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/paintcoatings/#paint-coatings__basecoatclearcoat-paint-systems) .
  2. Ensure the paint does not exceed 6 mils. Use a paint thickness gauge suitable for non-ferrous metals. Refer to «Paint Gages»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/paintcoatings/#paint-coatings__paint-gages) .
  3. Insert the sensor into the housing.
  4. Connect the electrical connector to the rear object sensor.

Rear Object Sensor Housing Replacement (All Other Vehicles)

  1. Remove the center rear bumper step pad or the rear bumper impact bar end cap. Refer to «Rear Bumper Step Center Pad Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-body-panels/#bumper-system-and-fascia) or «Rear Bumper Impact Bar End Cap Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-body-panels/#bumper-system-and-fascia) .
  2. Disconnect the sensor harness.
  3. Remove the sensor from the sensor housing. The sensor housing must be painted if replaced. If reinstalled, painting will not be necessary.
  4. Sand/grind sonic weld plastic residue from the fascia.
  5. Apply structural adhesive epoxy, Lord Fusor™ 127EZ or equivalent, to fascia at mating surface.
  6. Using the alignment tabs, install the sensor housing to the fascia.
  7. Allow adhesive to cure according to manufacturer's directions.
  8. Install the sensor to the sensor housing.
  9. Connect the electrical harness.
  10. Install the center rear bumper step pad or the rear bumper impact bar end cap. Refer to «Rear Bumper Step Center Pad Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-body-panels/#bumper-system-and-fascia) or «Rear Bumper Impact Bar End Cap Replacement»(/chevrolet/cab-chassis-silverado-3500-hd/2008-2011/remont/exterior-body-panels/#bumper-system-and-fascia) .

Scheme 6

Scheme 6: Rear Object Sensor Housing Replacement (Sierra/Silverado)
Scheme 6: Rear Object Sensor Housing Replacement (Sierra/Silverado)
CalloutComponent Name
Preliminary Procedure: Remove the rear object sensor. Refer to Rear Object Sensor Replacement .
1Rear Object Sensor Housing Procedure: Release the 2 tabs behind the housing to remove.

Scheme 7

Scheme 7: Rearview Camera Replacement
Scheme 7: Rearview Camera Replacement
CalloutComponent Name
Preliminary Procedure: Remove the pickup box endgate latch handle bezel. Refer to Pickup Box Endgate Latch Handle Bezel Replacement (Pickup) or Pickup Box Endgate Latch Handle Bezel Replacement (Utility) .
1Rear Object Camera Nut CAUTION: Refer to Fastener Caution . Tip: The rearview camera and the rearview control module are replaced as a complete assembly. Tighten: 2 N.m (18 lb in)
2Rear Object Camera Procedure Remove the endgate to assist in removal of the grommet and electrical connector with harness. Refer to Endgate Replacement . Disconnect the electrical connector.
CAUTION
Refer to Fastener Caution .

Rear Vision Camera System Operation (without UVB)

The components used in the rear vision camera system are the camera, located at the rear of the vehicle, and the inside rearview mirror, which houses the LCD display.

When the vehicle is placed in REVERSE, the body control module (BCM) sends a 12 volt signal to the inside rearview mirror and the rearview camera. This signal indicates that rear vision camera operation is required. Upon receipt of this signal, the mirror will begin the power up cycle for the LCD display and the camera will also power up. The rear vision camera transmits the video signal to the inside rearview mirror through discrete + and - signal circuits. A metallic foil encases the video signal circuits and is tied to a shield ground circuit. This shield is designed to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.

If desired, the rear vision camera may be manually disabled. Refer to the navigation system owners manual for instructions on manually disabling and enabling the rear vision camera system. The following conditions may cause a degraded rear vision camera image

  1. Ice, snow, or mud has built up on the rear vision camera
  2. Dark conditions
  3. Extreme light conditions, such as glare from the sun or the headlights of another vehicle
  4. Damage to the rear of the vehicle
  5. Extreme high or low temperatures or extreme temperature changes

Rear Vision Camera System Operation (with UVB)

The components used in the rear vision camera system are the camera, located at the rear of the vehicle, and the navigation radio.

When the vehicle is placed in REVERSE, the body control module (BCM) sends a 12 volt signal to the rearview camera. This signal indicates that rear vision camera operation is required. Upon receipt of this signal, the camera will begin the power up cycle. A serial data message is also received by the navigation radio indicating the vehicle is in REVERSE. Upon receipt of this message, the navigation radio will also begin a power up cycle for the display. The rear vision camera transmits the video signal to the navigation radio through discrete + and - signal circuits. A metallic foil encases the video signal circuits and is tied to a shield ground circuit. This shield is designed to reduce electronic interference which may degrade the video signal and cause a distorted or otherwise degraded image.

If desired, the rear vision camera may be manually disabled through the navigation system menu. Refer to the navigation system owners manual for instructions on manually disabling and enabling the rear vision camera system. The following conditions may cause a degraded rear vision camera image

  1. Ice, snow, or mud has built up on the rear vision camera
  2. Dark conditions
  3. Extreme light conditions, such as glare from the sun or the headlights of another vehicle
  4. Damage to the rear of the vehicle
  5. Extreme high or low temperatures or extreme temperature changes

If a malfunction is detected in the system, Service Rear Vision Camera may be displayed on the navigation radio as an indicator to the customer that a problem exists that requires service.

Object Detection Description and Operation (UD7)

The ultrasonic rear parking assist system is designed to identify and notify the driver of an object in the vehicle's path when reversing at speeds of less than 8 km/h (5 mph). The distance and location of the object is determined by 4 object sensors located in the rear bumper. The parking assist system will notify the driver using the information center telltale assembly and an audible signal through the radio.

The rear parking assist system is made up of the following components

  1. Object alarm module
  2. Object alarm sensors
  3. Information center telltale assembly
  4. Parking assist disable switch

Object Alarm Module

The object alarm module provides an 8-volt reference and a low reference to the four object alarm sensors. The object alarm module receives individual signals from each of the four sensors and determines the location and distance of an object based on these inputs. When an object is detected, the object alarm module will illuminate the appropriate LED on the information center telltale assembly and send a serial data message to the radio requesting an audible alert.

Object Alarm Sensor

The object alarm sensors are located in the rear bumper of the vehicle. The sensors are used to determine the distance between an object and the rear bumper. Each sensor emits an ultrasonic frequency which is reflected off object located behind the vehicle. These reflections are received by the sensors. The time difference between when the frequency was emitted and when the reflection is received, known as sensor ring time, is used to determine the distance to the object. The sensors report this information to the object alarm module.

Information Center Telltale Assembly

The information center telltale assembly is located in the interior rear of the vehicle and is visible through the inside rearview mirror. The indicator contains three LEDs: two amber and one red. The object alarm module controls these three LEDs as a visual indicator of how close the vehicle bumper is to an object. The object alarm module supplies voltage to each of the LEDs and commands each LED on by supplying an individual ground.

Parking Assist Disable Switch

The parking assist disable switch is used as a means to manually disable the system, if desired. Pressing the switch will ground the park assist disable switch signal circuit, indicating to the object alarm module that a system disable is requested. The object alarm module will respond by grounding the indicator control circuit, illuminating the indicator on the switch.

Rear Parking Assist Operation

When the vehicle is first placed into reverse, the rear parking assist system performs a bulb check. During the bulb check, the all three LED located in the information center telltale assembly will illuminate for approximately 2 seconds to indicate that the system is working.

When backing up at speed of less than 8 km/h (5 mph), the system is constantly monitoring for object of interest located behind the vehicle. The rear parking assist system can detect objects greater than 7.6 cm (3 in) wide and 25.4 cm (10 in) tall. The system cannot detect objects below the bumper, underneath the vehicle. If an object is detected, one of the following will occur

  1. If the object is 1-2.5 m (40-96 in) away from the vehicle, the amber outside indicator will illuminate and a single chime will sound when the object is first detected.
  2. If the object is 0.6-1.0 m (23-40 in) away from the vehicle, the amber outside and the amber middle indicators will illuminate.
  3. If the object is 0.3-0.6 m (11-23 in) away from the vehicle, the amber outside, amber middle, and red outside indicators will illuminate and the chime sounds continuously.
  4. If the object is less than 0.3 m (12 in) away from the vehicle, the amber outside, amber middle, and red outside indicators will flash and the chime sounds continuously.

If the rear parking assist system detects a malfunction, a DTC will be stored and the object alarm module will send a serial data message to the instrument panel cluster (IPC) to display the SERVICE PARK ASSIST message on the driver information center (DIC). A chime will sound and the red LED on the information center telltale will be illuminated as a notification to the driver that a malfunction exists and the system is disabled.

SERVICE PARK ASSIST

The driver information center (DIC) displays SERVICE PARK ASSIST when the object alarm module detects a malfunction in the rear parking assist system and the system is disabled. The DIC also displays SERVICE PARK ASSIST when a loss of communication occurs with the object alarm module.

PARK ASSIST OFF

The PARK ASSIST OFF message is displayed in the DIC when the object alarm system is disabled due to conditions that disable or inhibit the system. The red LED in the information center telltale assembly will be illuminated, as will the disable indicator on the park assist disable switch. The object alarm module requests the DIC display PARK ASSIST OFF when it detects one of the following conditions

  1. The rear parking assist system is manually disabled using the parking assist disable switch.
  2. The park brake is applied or not fully released.
  3. An object is attached to the rear of the vehicle, such as a trailer, bicycle rack, trailer hitch receiver, or tow bar. Also, an object extending beyond a lowered tailgate will disable the system.
  4. The object alarm sensors are covered by snow, mud, dirt, slush, or ice.
  5. The vehicle bumper is damaged.
  6. Excessive paint thickness on a replacement parking assist sensor.
  7. The object alarm sensors are disrupted by vibrations, like those caused by a large nearby vehicle or from heavy equipment such as a jackhammer.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Connector Repairs
• Control Module References
• Diagnostic Repair Verification
• Accessory Switch Replacement (with RPO SLT)
• Object Alarm Module Programming and Setup
• Checking Aftermarket Accessories
• Backup Lamps Malfunction (Automatic Transmission)
• Front Seat Replacement - Bucket
• Fastener Caution
• Center Pillar Upper Garnish Molding Replacement
• Basecoat/Clearcoat Paint Systems
• Paint Gages
• Rear Bumper Step Center Pad Replacement
• Pickup Box Endgate Latch Handle Bezel Replacement (Pickup)
• Endgate Replacement
• DTC B0958, B0959, B0960, or B0961
• Object Detection Description and Operation (UD7)