Symptom Related Diagnostic Procedures
Garage Door Opener 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.
Diagnostic Fault Information
Circuit/System Description
The universal home remote is a transmitter operating between 288 and 434 MHz. The universal home remote has three buttons that may be programmed for individual transmitter/receiver combinations to control up to three garage doors, 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 (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Garage Door Opener Description and Operation (Description and Operation)
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)
Special Tools
J 41540 Universal Home Remote Tester
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the S25 garage door opener.
2. Ignition OFF, test for less than 5 ohm 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.
Note: This step will clear any learned transmitters from the S25 garage door opener. This will require reprogramming by the customer to reestablish universal home remote functionality.
4. Hold the two outer buttons on the S25 garage door opener for 10 seconds. The LEDs will flash quickly indicating it has entered the diagnostic mode. Place the J 41540 adjacent to the S25 garage door opener and press each button of the universal home remote one at a time. The tester should indicate when each button is pressed.
5. Using the Hand Held Transmitter from the J 41540 kit, program a single button on the S25 garage door opener. Verify the Programmed LED on the test tool lights with the newly programmed vehicle universal home remote. This verifies the transmitter can learn a new function.
• If the tester indicates that one or more of the buttons does not respond, replace the S25 garage door opener.
6. Instruct the customer to program the S25 garage door opener. Refer to the vehicle owners manual. If further malfunction occurs, a possible rolling code or incompatibility with the S25 garage door opener will prevent programming.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for universal home remote replacement, setup, and programming