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 MANUALSCHEVROLET1994ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - RESTRAINTS AND SAFETY SYSTEMSAIR BAG CONTROL MODULESERVICE AND REPAIRSENSING AND DIAGNOSTIC MODULE REPLACEMENT (SDM)
1994 Chevrolet Astro Van M V6-262 4.3L VIN Z
Sensing and Diagnostic Module Replacement (SDM)
1994 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Sensing and Diagnostic Module Replacement (SDM)
Prior to performing replacement procedures, disarm air bag system. Refer to, Service and Repair/ Air Bag System Disarming & Air Bag System Arming. Refer to, / Specifications/ Mechanical for torque values when installing components.
All sensors and mounting bracket bolts must be carefully torqued to assure proper operation. Never power up the air bag system when any sensor is not rigidly attached to the vehicle, since the sensor could be activated when not attached, causing air bag deployment.
1. Disconnect battery ground cable.
2. Remove left front seat.
3. Remove carpet retaining sill trim molding.
4. Fold back carpet to access SDM.
5. Disconnect connector assurance and electrical connector.
6. Remove SDM attaching nuts and SDM module.
7. Reverse procedure to install.
All sensors and mounting bracket bolts must be carefully torqued to assure proper operation. Never power up the air bag system when any sensor is not rigidly attached to the vehicle, since the sensor could be activated when not attached, causing air bag deployment.
1. Disconnect battery ground cable.
2. Remove left front seat.
3. Remove carpet retaining sill trim molding.
4. Fold back carpet to access SDM.
5. Disconnect connector assurance and electrical connector.
6. Remove SDM attaching nuts and SDM module.
7. Reverse procedure to install.
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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.