SAAB WIS ONLINE

GMLAN Wiring Repairs

GMLAN Wiring Repairs



Special Tools

• EL-38125-10 Splice Sleeve Crimping Tool

• J 38125-5 Ultra Torch Special Tool

• DuraSeal splice sleeves

• A wire stripping tool


For equivalent regional tools, refer to Special Tools .

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 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.

GMLAN Repairs

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 .

GMLAN Connector Terminal Repair

Note

A terminated lead 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.


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 for the appropriate connector repair procedure.

GMLAN Wire Repair

Note

Refer to Wiring Repairs 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 any wire except the pigtail is damaged, repair the wire by splicing in a new section of wire of the same gauge size (0.5 mm, 0.8 mm, 1.0 mm etc.). Use the DuraSeal splice sleeves and EL-38125-10 tool. Use the following wiring repair procedures in order to ensure the integrity of the DuraSeal splice sleeves.

Splice Sleeve Color Crimp Tool Nest Color Wire Gauge mm 2 / (AWG)
Salmon (Yellow-Pink)

12089189

Red (1)

0.035-0.8/(18-20)

Blue

12089190

Blue (2)

1-2/(14-16)

Yellow

12089191

Yellow (3)

3-5/(10-12)

Green

88988379

Red (1)

0.22-0.35/(22-26)




1.
Note

You must perform the following procedures in the listed order. Repeat the procedure if any wire strands are damaged. You must obtain a clean strip with all of the wire strands intact.


Open the harness by removing any tape:

• Strip the harness with a seam ripper (available from a haberdashery). In this way, the insulation will not be damaged.

• Use the DuraSeal splice sleeves on all types of insulation except tefzel and coaxial.

• Do not use the crimp and DuraSeal splice sleeve to form a splice with more than 2 wires coming together.

2. Cut as little wire off the harness as possible. You may need the extra length of wire in order to change the location of a splice.

Adjust splice locations so that each splice is at least 40 mm (1.5 in) away from the other splices, harness branches, or connectors.

3. Strip the insulation:

• When adding a length of wire to the existing harness, use the same size wire as the original wire.

• Perform one of the following items in order to find the correct wire size:

- Find the wire on the schematic and convert to regional wiring gauge size.

- If you are unsure of the wire size, begin with the largest opening in the wire stripper and work down until achieving a clean strip of the insulation.

• Strip approximately 7.5 mm (0.313 in) of insulation from each wire to be spliced.

• Do not nick or cut any of the strands. Inspect the stripped wire for nicks or cut strands.

• If the wire is damaged, repeat this procedure after removing the damaged section.

4. Select the proper DuraSeal splice sleeve according to the wire size. Refer to the above table at the beginning of the repair procedure for the color coding of the DuraSeal splice sleeves and the crimp tool nests.

5. Use the EL-38125-10 tool in order to position the DuraSeal splice sleeve in the proper color nest of the splice sleeve crimp tool. The crimp tool has four nests, one for each color.


6. Place the DuraSeal splice sleeve in the nest. Ensure that the crimp falls midway between the end of the barrel and the stop. The sleeve has a stop (3) in the middle of the barrel (2) in order to prevent the wire (1) from going further. Close the hand crimper handles slightly in order to firmly hold the DuraSeal splice sleeve in the proper nest.


7. Insert the wire into the splice sleeve barrel until the wire hits the barrel stop.


8. Tightly close the handles of the crimp tool until the crimper handles open when released.

The crimper handles will not open until you apply the proper amount of pressure to the DuraSeal splice sleeve. Repeat steps 4 and 5 for the opposite end of the splice.

9. Using the heat torch, apply heat to the crimped area of the barrel.


10. Start in the middle and gradually move the heat barrel to the open ends of the tubing:

• The tubing will shrink completely as the heat is moved along the insulation.

• A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved.