Garage Door Opener Inoperative (Three LEDs)

Garage Door Opener Inoperative (Three LEDs)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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 (GDO) is a transmitter operating between 288 and 399 MHz. The GDO has 3 buttons that may be programmed for individual transmitter/receiver combinations to control up to 3 GDOs, security gates, and lighting systems. Each button represents a transmitter code section of the transmitter, which operates separately from any other button, and may be considered a separate transmitter. Battery voltage is provided to the GDO from the PCM fuse in the underhood fuse block.

Diagnostic Aids

In circuit/system testing, in step 4, the two outer buttons of the transmitter are pressed and held in order to enter the diagnostic mode so that the transmitter can be used with the GDO tester. The transmitter will complete the following during the process:

1. After 20 seconds, the LEDs will flash indicating all codes are cleared and the default settings are set.
2. After an additional 10 seconds the LEDs will flash again indicating that the diagnostic settings are now programmed into all three buttons.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the GDO.
2. Ignition OFF, test for less than 1.0 ohm of resistance 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.

4. Ignition ON, hold the 2 outer buttons on the GDO for 30 seconds. Place the J 41540 adjacent to the GDO and press each button of the GDO 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 GDO.

5. Program the GDO with the customers remote. A possible rolling code or incompatibility with the GDO receiver will prevent programming. Refer to www.learcar2u.com or 1-866-572-2728.

Repair Instructions

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

Control Module References for GDO replacement, setup, and programming