For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### Circuit/System Description

The parking assist indicator is located in the interior rear of the vehicle as part of the information center telltale assembly. The 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

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Object Detection Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, perform the scan tool LED Test. Each of the three LEDs should illuminate during the test cycle.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the information center telltale assembly.
2. Ignition ON, verify that a test lamp illuminates between the voltage control circuit terminal A and ground.

⇒ | If the test lamp does not illuminate, test the voltage control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.

3. Connect a test lamp between the voltage control circuit terminal A and the appropriate LED control circuit:

• | Left amber LED - terminal B

• | Center amber LED - terminal C

• | Red LED - terminal D

4. Command the appropriate LED ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the object alarm module.

⇒ | If the test lamp is always OFF, test the control 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 information center telltale assembly.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Information Center Telltale Assembly Replacement

• | Control Module References for the object alarm module replacement, setup, and programming