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 object sensor control module directly controls the parking assist indicators located in the rear parking assist display. The rear parking assist display 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 rear object sensor control 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 rear object sensor control module. Each LED is also discretely controlled by the rear object sensor control module.

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 (UD7 with Display) (Object Detection Description and Operation (UD7 with Display))Object Detection Description and Operation (UD7 Audio Only) (Object Detection Description and Operation (UD7 Audio Only))Object Detection Description and Operation (B3T) (Object Detection Description and Operation (B3T))Object Detection Description and Operation (UVC) (Object Detection Description and Operation (UVC))
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 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.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear parking assist display.
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 rear object sensor control module.
• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the rear object sensor control module.

3. Command the appropriate LED ON with a scan tool and test for 10.5 - 12.5 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 less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear object sensor control module.
• If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the rear object sensor control module.

4. If all circuits test normal, test or replace the rear parking assist display.

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 Rear Object Sensor Control Module replacement, setup, and programming