Avalanche 4WD V8-5.3L (2011)
Garage Door Opener Transmitter: Symptom Related Diagnostic Procedures
Garage Door Opener Inoperative
Diagnostic Instructions
*
Perform the Diagnostic System Check - Vehicle See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle prior to using this diagnostic procedure.
*
Review Strategy Based Diagnosis See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis for an
overview of the diagnostic approach.
*
Diagnostic Procedure Instructions See: Testing and Inspection/Initial Inspection and Diagnostic Overview/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 three buttons that may be programmed for
individual transmitter/receiver combinations to control up to three GDOs, 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 See: Antitheft and Alarm Systems/Keyless Entry/Keyless Entry Transmitter/Diagrams/Electrical Diagrams
Connector End View Reference
Component Connector End Views See: Diagrams/Connector Views/Connector End Views By Name
Description and Operation
Garage Door Opener Description and Operation See: Description and Operation
Electrical Information Reference
*
Circuit Testing See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing
*
Connector Repairs See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs
*
Testing for Intermittent Conditions and Poor Connections See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections
*
Wiring Repairs See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs
Scan Tool Reference
Control Module References See: Testing and Inspection/Programming and Relearningfor scan tool information
Special Tools
J 41540 Universal Home Remote Tester
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the GDO.
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.
Important: This step will clear any learned transmitters from the GDO. This will require reprogramming by the customer to reestablish
GDO functionality.
4. Ignition ON, hold the two outer buttons on the GDO 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 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. Instruct the customer to program the GDO. Refer to the vehicle owners manual. A possible rolling code or incompatibility with the GDO receiver
