Parking Assist System Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Parking Assist Switch Indicator Ignition
|
B0968 06
|
B0968 06
|
-
|
-
|
Parking Assist Switch Signal
|
B0967 02
|
1
|
-
|
-
|
Parking Assist Switch Indicator Control
|
B0968 06
|
B0968 06
|
B0968 01
|
-
|
Parking Assist Switch Ground
|
-
|
1
|
-
|
-
|
1. Parking Assist Switch Malfunction
|
|
| |
Circuit/System Description
The ultrasonic parking assist system is designed to identify and
notify the driver of an object in the vehicle's path when moving
forward or reversing at speeds of less than 8 km/h (5 MPH). The
distance and location of the object is determined by eight object
sensors: four located in the rear bumper and four located in the
front bumper. The parking assist system will notify the driver
using an audible signal through the radio.
Diagnostic Aids
The following is a brief description of potential causes which
may aid in diagnosis:
| • |
Manual Disable-The parking
assist system has been disabled through the parking assist switch
or audio system personalization menu. |
| • |
Hitch/Object Attached-The
parking assist control module is detecting an object that is
attached to the vehicle. Common items such as a hitch receiver,
trailer, 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 parking assist control
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). |
| • |
Vehicle Overspeed-The vehicle
is travelling too fast in reverse at speeds of greater than 8 km/h
(5 MPH). |
| • |
Inhibit-The parking assist
control module has lost or received invalid GMLAN signal(s).
|
| • |
Sensor Disturbance-An outside
interference is causing sensor movement. Such interference may be
caused a heavy pounding, like that of a nearby jackhammer, or large
changes in pressure, such as a large truck's air brakes.
|
| • |
Sensor Ring Time-If the sensor
fails its own diagnostic initialization the parking assist control
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. |
Reference Information
Schematic Reference
Object Detection Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Object Detection Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
Circuit/System Verification
| 1. |
Ignition ON, verify the park
assist system is enabled through the parking assist switch.
|
| ⇒ |
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 parking
assist switch. The parameter should change between Active and
Inactive. |
| ⇒ |
If the parameter does not change between the
specified values, refer to Parking Assist Switch Circuit
Malfunction. |
| 3. |
Command the Park Assist Switch
LED output control ON and OFF with the scan tool. The parking
assist switch indicator should turn ON and OFF when changing
between the commanded states. |
| ⇒ |
If the indicator does not turn ON and OFF, refer
to Parking Assist Switch Indicator Circuit Malfunction. |
| 4. |
For vehicles with manual
transmission: Transmission in reverse, verify the Engine Control
Module (ECM) scan tool Reverse Position Switch parameter is
Active. |
|
Note: 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).
|
| 5. |
Transmission in REVERSE,
verify the scan tool Park Assist System Status parameter displays
Enable. |
| ⇒ |
If not the specified value, refer to Diagnostic
Aids to determine the cause of the inhibit. |
Circuit/System Testing
Parking Assist Switch Circuit Malfunction
| 1. |
Ignition OFF, remove the
ignition key, open the driver door and disconnect the scan
tool. |
| 2. |
Disconnect the X1 harness
connector at the K41 Parking Assist Control Module and the harness
connector at the S48D Multi-Function Switch 2 - Instrument
Panel. |
| 3. |
Test for less than 5 Ω
between the S48D Multi-Function Switch 2 - Instrument Panel low
reference circuit terminal 2 and ground. |
| ⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. |
| 4. |
Ignition ON, test for less
than 0.3 V between the signal circuit terminal 8 X1 at the K41
Parking Assist Control Module harness connector and ground.
|
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to voltage. |
| 5. |
Ignition OFF, connect the
harness connector at the S48D Multi-Function Switch 2 - Instrument
Panel. |
| 6. |
Ignition ON, verify that a
test lamp does not illuminate between the B+ circuit terminal 1 X1
at the K41 Parking Assist Control Module harness connector and
signal circuit terminal 8 X1. |
| ⇒ |
If the test lamp illuminates, test signal circuit
for a short to ground. If the circuit tests normal, replace the
S48D Multi-Function Switch 2 - Instrument Panel. |
| 7. |
Verify that the test lamp
illuminates between the B+ circuit terminal 1 X1 at the K41 Parking
Assist Control Module harness connector and signal circuit terminal
8 X1 while pressing the parking assist switch. |
| ⇒ |
If the test lamp does not illuminate, test the
signal circuit for an open/high resistance. If all circuits test
normal, replace the S48D Multi-Function Switch 2 - Instrument
Panel. |
| 8. |
If all circuits test normal,
replace the K41 Parking Assist Control Module. |
Parking Assist Switch Indicator Circuit Malfunction
| 1. |
Ignition OFF, disconnect the
harness connector at the S48D Multi-Function Switch 2 - Instrument
Panel. |
| 2. |
Ignition ON, test for greater
than 11 V between the ignition circuit terminal 3 and
ground. |
| ⇒ |
If less than the specified range, test the
ignition circuit for a short to ground or an open/high
resistance. |
| 3. |
Command the Park Assist Switch
LED output control ON with the scan tool. Test for greater than 11
V between the ignition circuit terminal 3 and the signal circuit
terminal 5. |
| ⇒ |
If less than the specified range, test the signal
circuit for an open/high resistance. If all circuits test normal,
replace the K41 Parking Assist Control Module. |
| 4. |
Command the Park Assist Switch
LED output control OFF with the scan tool. Test for less than 0.3 V
between the ignition circuit terminal 3 and the signal circuit
terminal 5. |
| ⇒ |
If greater than the specified range, test the
signal circuit for a short to ground. If all circuits test normal,
replace the K41 Parking Assist Control Module. |
| 5. |
If all circuits test normal,
replace the S48D Multi-Function Switch 2 - Instrument Panel.
|
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
