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 MANUALSMERCURY1999SABLE LS, 4D SEDAN, 3.0 SREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSREAR WINDOW DEFOGGER SYSTEMDIAGNOSTIC TROUBLE CODE (DTC) TESTSDTC B1345: DEFOGGER SWITCH SIGNAL SHORT TO GROUND
1999 Mercury Sable LS, 4D Sedan, 3.0 S
DTC B1345: Defogger Switch Signal Short To Ground
1999 Mercury Sable LS, 4D Sedan, 3.0 SSECTION DTC B1345: Defogger Switch Signal Short To Ground
- Disconnect Black 16-pin harness connector from integrated control panel. Using New Generation Star (NGS) scan tester, access GEM. Select RDEF_SW Parameter Identification (PID) data. If PID indicates ACTIVE, go to next step. If PID does not indicate ACTIVE, replace integrated control panel.
- Disconnect 16-pin harness connector from GEM, located behind fuse junction panel. Using ohmmeter connected to ground, measure resistance at pin No. 8 (Dark Blue/Orange wire) at 16-pin GEM connector. If resistance is greater than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short to ground in Dark Blue/Orange wire. See WIRING DIAGRAMS .
- Using NGS tester, access GEM. Select WIGGLE TEST from NGS tester menu. Wiggle and tap on associated connectors while performing test. If DTC B1345 is retrieved, repair suspect wire that was wiggled when DTC B1345 set. If DTC B1345 does not appear, replace GEM and repeat self-diagnostics.
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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.