Parking Assist Indicator Malfunction

Parking Assist Indicator Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

Circuit/System Description

The rear parking assist display is located in the interior rear of the vehicle and is visible through the inside rearview mirror. The front information center telltale assembly is located on the instrument panel. Each 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.

Reference Information
Schematic Reference

Object Detection Schematics ([1][2]Collision Avoidance and Parking Assist Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Object Detection Description and Operation (UFL) (Object Detection Description and Operation (UFL))Object Detection Description and Operation (UFR) (Object Detection Description and Operation (UFR))Object Detection Description and Operation (UFT) (Object Detection Description and Operation (UFT))
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, command each LED ON and OFF with a scan tool. The appropriate indicator should turn ON and OFF as commanded.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the information center telltale assembly or rear parking assist display.
2. Ignition ON, test for 9.0-12.5 V between the appropriate supply voltage circuit terminal listed below and ground:

* Front - terminal 4
* Rear - terminal A

• 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:

Front
* Left amber LED - terminal 3
* Center amber LED - terminal 2
* Red LED - terminal 1

Rear
* Left amber LED - terminal B
* Center amber 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:

Front
* Left amber LED - terminal 3
* Center amber LED - terminal 2
* Red LED - terminal 1

Rear
* Left amber LED - terminal B
* Center amber 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:

Front
* Left amber LED - terminal 3
* Center amber LED - terminal 2
* Red LED - terminal 1

Rear
* Left amber LED - terminal B
* Center amber 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 appropriate information center telltale assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Information Center Telltale Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for the object alarm module replacement, setup, and programming.