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 garage door opener is a transmitter operating between 288 and 399 MHz. The garage door opener has three buttons that may be programmed for individual transmitter/receiver combinations to control up to three garage door openers, security gates, lighting systems, etc. Each button represents a unique transmitter code section, which operates independently of the other buttons, and may be considered a separate transmitter.

### Reference Information

#### Schematic Reference

Remote Function Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Garage Door Opener 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

#### Special Tools

J 41540 Universal Home Remote Tester

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the garage door opener.
2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal 3 and ground.

⇒ | If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

Important: This step will clear any learned transmitters from the garage door opener. This will require reprogramming by the customer to reestablish garage door opener functionality.

4. Ignition ON, hold the two outer buttons on the garage door opener for 30 seconds. After 20 seconds, the LEDs will flash indicating that all learned transmitter values have been cleared. After an additional 10 seconds, the LEDs will flash again indicating it has entered the diagnostic mode. Place the J 41540 adjacent to the garage door opener and press each button of the garage door opener one at a time. The tester should indicate when each button is pressed.

⇒ | If the tester indicates that one or more of the buttons does not respond, replace the garage door opener.

5. Instruct the customer to program the garage door opener. Refer to the vehicle owners manual. A possible rolling code or incompatibility with the garage door opener receiver will prevent programming. Refer to www.learcar2u.com or 1-866-572-2728 (in the United States).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for garage door opener replacement, setup, and programming