Rear Park Assist Inoperative Genuine Accessory
Diagnostic Fault Information
Perform the
Diagnostic System Check - Vehicle
prior
to using this diagnostic procedure.
Circuit/System Description
The rear park assist system (RPA) is designed to assist the driver when reversing
and should not be used as a substitute for safe driving practices. The RPA is equipped
with a module, a warning buzzer and ultrasonic sensors. The ultrasonic sensors operate
both as transmitters and receivers of ultrasonic signals. The driver is alerted to
approaching objects by a sequence of pulses or continuous tones from the warning buzzer.
Reference Information
Schematic Reference
Object Detection Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Circuit/System Testing
Important: The warning buzzer component testing should
be performed prior to circuit/system testing.
- Ignition ON, engine OFF, select reverse and verify that the reverse lights illuminate.
⇒ | If inoperative, inspect the backup lamp fuse or the backup lamp relay. |
- Ignition OFF, disconnect the external relay.
- Verify that a test lamp does not illuminate between the control circuit
terminal 2 and ground.
⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
- Ignition ON, engine OFF, select reverse, verify that a test lamp illuminates
between the external relay reverse control circuit terminal 1 and ground.
⇒ | If the test lamp does not illuminate, test the external relay reverse control
circuit terminal 1 for a short to ground or an open/high resistance. |
- Verify that a test lamp illuminates between the B+ circuit terminal 5
and ground.
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground
or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is
open, test or replace the external relay. |
- Ignition OFF, disconnect the RPA module harness connector X1.
- Ignition ON, engine OFF, connect a 2-A fused jumper wire between the external
relay B+ circuit terminal 1 and the external relay control circuit terminal 2.
Verify that a test lamp illuminates between the RPA module harness connector X1-2
and ground.
⇒ | If test lamp does not illuminate, refer to the installation instructions and
verify the correct patch harness is used or test the external relay control circuit 2
for a short to ground or an open/high resistance. |
- Connect a test lamp between the B+ terminal 5 and the ground terminal 3.
Verify that the test lamp turns ON. If the test lamp is always OFF:
• | Verify that the 7-pin trailer connector micro-switch is functional
and that the dust cover is closed. |
• | Test the external relay ground circuit for an open/high resistance. If
all circuits test normal, replace the external relay. |
- Test for less than 1.0 Ohm resistance between the RPA module harness
connector X1-1 and ground.
⇒ | If greater than the specified value, refer to the installation instructions
and verify the correct patch harness is used or test the ground circuit for an open/high
resistance. If the circuit tests normal, replace the RPA module. |
Component Testing
Warning Buzzer Function Test
- Verify that the warning buzzer is inoperative.
- Visibly inspect the warning buzzer disable switch and ensure that the
warning buzzer is not disabled.
- Ignition OFF, disconnect the RPA module harness connector X1.
- Connect a ground to terminal X1-3 and a B+ voltage supply to terminal X1-4.
The warning buzzer should sound continuously.
⇒If not a continuous
tone, replace the warning buzzer.
Repair Instructions
For component removal and installation refer to the accessory fitting instructions.
Perform the
Diagnostic Repair Verification
after
completing the diagnostic procedure.