Description / Abstract: Introduction

Note: Nothing in this standard supercedes applicable laws and regulations

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose. To determine the door inner panel/trim maximum inboard and outboard displacement due to the window regulator forces as the window glass cycles or moves up and down. This procedure can be conducted both with and without the interior trim attached to the door.

Applicability. This procedure applies to all passenger cars, light duty trucks and medium duty trucks having any regulator driven window system (this may include side doors, rear cargo doors, quarter windows, station wagon endgates, etc.) Inner panel breathing of swing-out window systems and sunroofs may also follow the logic of this procedure, but may require unique considerations and/or modifications.

Remarks. This test is often run in conjunction with test procedure GMW15843 Closure Panel System - Inner Panel/Trim Flutter Structural Test.

Note: Discuss with the requesting engineer if this test is to evaluate the door inner panel, or the door interior trim panel, or both. If both, resolve the desired priority.

Note: If the test is to be run “by itself”, the basic dial indicator instrumentation may suffice. If it is to be run in conjunction with GMW15843, the more sophisticated instrumentation and fixturing may be required. See 3.2.2 Instrumentation.

Note: Throughout this test procedure, the descriptions and methods of testing inner panel/trim breathing are predominantly based on the use of non-contact displacement transducers such as a “Pulsonic” ultrasonic displacement sensor. The GMNA Body Test Lab, however, has performed “breathing” testing using dial indicators and also using high-speed video.