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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 7 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC CHARTSDTC 18 - PASSENGER-SIDE DEPLOYMENT LOOP SHORT TO GROUNDDTC WILL CLEAR
1999 GMC Forward Control 5.7 R, Automatic
DTC Will Clear
1999 GMC Forward Control 5.7 R, AutomaticSECTION DTC Will Clear
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Savana Special, 1996 GMC Savana Camper Special, and 1996 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
DTC 18 is a latched code and cannot be cleared. Repair malfunction that set DTC before replacement of inflatable restraint control module.
NOTE:
Test numbers refer to test numbers on diagnostic chart. For circuit number identification, see WIRING DIAGRAMS
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- 2) This test determines PASSENGER-SIDE LOW voltage measured by inflatable restraint control module.
- 3) This test isolates malfunction to one side of inflatable restraint I/P module Yellow 2-way connector located behind passenger knee bolster.
- 5) This test determines whether malfunction is in CKT 1403.
- 7) This test determines whether malfunction is in CKT 1404.
RENDER: 1.0x
NO RELATED
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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.