Electrical - Aftermarket Equipment Installation
GROUP: 91NUMBER: 93-02
DATE: April 30, 1993
SUBJECT:
Installation of Electrical Aftermarket Equipment
MODEL(s):
All All m.y.
Also applies to Repair Group 67
Condition
Electrical problems develop after installation of aftermarket electrical equipment such as aftermarket alarm systems. telephones, radio cassette players, CD players, etc.
General Information
The no-load current draw of added equipment such as aftermarket alarm systems or telephones, may cause the battery to discharge. Often inferior connectors are used to splice into the vehicle's existing systems causing them to malfunction. Aftermarket alarm systems and telephones are usually installed by non-VW technicians who are not familiar with the function, operation or wiring of VW components and systems.
Improper installation and incorrect connections may also have an adverse effect on engine and transmission function and performance.
Wiring of aftermarket equipment is usually installed parallel to the existing wiring. Electrical interference between the vehicle's electrical system and the aftermarket equipment may cause the vehicle and/or the aftermarket equipment to malfunction. Open circuits may be created during installation of the aftermarket equipment which may be difficult to troubleshoot and repair.
Holes drilled into body panels without proper corrosion protection or lack of rubber grommets can lead to corrosion and cut wiring resulting in short circuits. Such improper installations may cause electrical fires.
Always refer to the appropriate technical information (Repair Manuals, Wiring Diagrams, Technical Bulletins, etc.) and follow all Cautions and Warnings if and when aftermarket equipment is installed.