Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDIAGRAMSDIAGNOSTIC AIDSWIRING REPAIRSSIR WIRING REPAIRS
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
SIR Wiring Repairs
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION SIR Wiring Repairs
The Supplemental Inflatable Restraint (SIR) system requires special wiring repair procedures due to the sensitive nature of the circuitry. Follow the specific procedures and instructions when working with the SIR system wiring, and the wiring components (such as connectors and terminals).
IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR system terminals unless specifically indicated by the terminal package.
Tools Required
J 38125-B Terminal Repair kit
The tool kit J38125-B contains the following items:
^ Special sealed splices - in order to repair the SIR system wiring
^ A wire stripping tool
^ A special crimping tool
^ A heat torch
^ An instruction manual
The sealed splices 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-B also serves as a generic terminal repair kit. The kit contains the following items:
^ A large sampling of common GM 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
IMPORTANT: Do not use the terminals in the kit in order to replace damaged SIR system terminals unless specifically indicated by the terminal package.
Tools Required
J 38125-B Terminal Repair kit
The tool kit J38125-B contains the following items:
^ Special sealed splices - in order to repair the SIR system wiring
^ A wire stripping tool
^ A special crimping tool
^ A heat torch
^ An instruction manual
The sealed splices 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-B also serves as a generic terminal repair kit. The kit contains the following items:
^ A large sampling of common GM 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
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.