Object Detection System: Diagnosis Chevrolet Silverado 3500 HD

DIAGNOSTIC CODE INDEX

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»(ref-317170-S03444519162009060900000) prior to using the diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

Diagnostic Fault Information

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

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.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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.

Action Taken When the DTC Sets

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

Diagnostic Aids

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

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.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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. 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.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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

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. 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.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(ref-317172-S31262273302009060900000) .
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.

Symptom List

1. «Parking Assist System Malfunction»(ref-317132-S25020323392009060900000)
2. «Parking Assist Indicator Malfunction»(ref-317132-S39472689182009060900000)
3. «Rear Vision Camera System Malfunction (with UVB)»(ref-317132-S10002271582009060900000) or «Rear Vision Camera System Malfunction (without UVB)»(ref-317132-S34637608542009060900000)

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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.

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.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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.

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)»(ref-317143-S02366784942009060900000) or «Backup Lamps Malfunction (Manual Transmission)»(ref-317143-S24146517062009060900000) .
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.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

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.

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)»(ref-317143-S02366784942009060900000) or «Backup Lamps Malfunction (Manual Transmission)»(ref-317143-S24146517062009060900000) .
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.