Savana 3500 V8-4.8L (2009)
GMLAN Wiring Repairs
GMLAN Wiring Repairs
J-38125 Terminal Repair Kit
The GM Local Area Network (GMLAN) System requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific
procedures and instructions when working on GMLAN connectors and terminals.
The tool kit J-38125 contains the following items in order to repair the GMLAN wiring:
DuraSeal splice sleeves
A wire stripping tool
J 38125-8 Crimping Tool
J 38125-5 Ultra Torch Special Tool
The DuraSeal splice sleeves have the following 2 critical features:
A special heat shrink sleeve environmentally seals the splice. The heat shrink sleeve contains a sealing adhesive inside.
A cross hatched (knurled) core crimp provides necessary contact integrity for the sensitive, low energy circuits.
The J-38125 also serves as a generic terminal repair kit. The kit contains the following items:
A large sampling of common electrical terminals
The correct tools in order to attach the terminals to the wires
The correct tools in order to remove the terminals from the connectors
Note: When making a repair to any GMLAN network, the original wire length after the repair must be the same length as before the repair. If the
network is a twisted pair, the twist must be maintained after the repair is completed.
GMLAN has 2 types of networks, low speed and high speed. Low speed GMLAN has a single wire and works at slow speeds. High speed GMLAN has 2
wires in a twisted pair and works at higher speeds. For more information on GMLAN, refer to Data Link Communications Description and Operation (
See: Powertrain Management/Computers and Control Systems/Information Bus/Description and Operation).
GMLAN Connector Terminal Repair
Note: A service terminal can be used to replace damaged connector terminals for both high speed and low speed GMLAN systems. When making a
connector terminal repair on a GMLAN high speed system with twisted pair wires, do not untwist the wires more than necessary to make the repair.
The terminals in the GMLAN system are made of a special metal. This metal provides the necessary contact integrity for the sensitive, low energy
circuits. These terminals are available in the J-38125 . If the individual terminals are damaged on any GMLAN connection, use the appropriate
connector repair procedure in order to repair the terminal. Refer to Connector Repairs (See: Testing and Inspection/Component Tests and General
Diagnostics) for the appropriate connector repair procedure.
GMLAN Wire Repair
Note: Refer to Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics) in order to determine the correct wire size for
the circuit you are repairing. You must obtain this information in order to ensure circuit integrity.
If a wire is damaged, repair the wire by splicing in a new section of wire of the same gage size (0.5 mm, 0.8 mm, 1.0 mm, etc.). Use the DuraSeal splice
sleeves and splice crimping tool from the J-38125 . Use the following wiring repair procedures in order to ensure the integrity of the sealed splice.