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Front Wiper Mode Switch Sense Circuit Short To Ground

  1. Connect scan tool to Data Link Connector (DLC), under lower left side of instrument panel. Turn ignition on. Using scan tool, erase DTCs. Turn ignition off, then on. Wait 15 seconds. Operate wiper system in all modes. Using scan tool, read DTCs. If scan tool displays FRONT WIPER MODE SWITCH SENSE CIRCUIT SHORT TO GROUND, go to next step. If scan tool does not display FRONT WIPER MODE SWITCH SENSE CIRCUIT SHORT TO GROUND, problem is intermittent. Visually inspect and wiggle test related wiring.
  2. Turn ignition off. Disconnect Gray 20-pin multifunction switch connector. See Figure . Disconnect Central Timer Module (CTM) connectors. CTM is located behind left side kick panel. Using DVOM, measure resistance of Dark Green/Red wire between Gray 20-pin multifunction switch connector terminal No. 4 and Gray 26-pin CTM connector C1 terminal No. 8. See Figure and Figure . If resistance is more than 5 ohms, go to next step. If resistance is 5 ohms or less, repair short to ground in Dark Green/Red wire between Gray 20-pin multifunction switch connector terminal No. 4 and Gray 26-pin CTM connector C1 terminal No. 8.
  3. Check fuse No. 5 (20-amp) located in instrument panel junction block. Instrument panel junction block is located on left end of instrument panel. If fuse is okay, go to step  5 . If fuse is blown, go to next step.
  4. Disconnect Brown 11-pin instrument panel junction block connector C8. See Figure . Using DVOM, measure resistance between ground and Gray 26-pin Central Timer Module (CTM) connector C1 terminal No. 26 (Dark Blue wire). If resistance is 5 ohms or less, repair short to ground in Dark Blue wire between Brown 11-pin instrument panel junction block connector C8 terminal No. 10 and Gray 26-pin Central Timer Module (CTM) connector C1 terminal No. 26. If resistance is more than 5 ohms, check for short to ground in instrument panel junction block or other feed circuits powered by fuse No. 5. See POWER DISTRIBUTION article in WIRING DIAGRAMS. Repair as necessary.
  5. Set front wiper switch to intermittent position. Using DVOM, measure resistance between ground and Gray 26-pin CTM connector C1 terminal No. 8 (Dark Green/Red wire). If resistance is more than 5 ohms, replace CTM. See CENTRAL TIMER MODULE  under REMOVAL & INSTALLATION. If resistance is 5 ohms or less, replace multifunction switch. See MULTIFUNCTION SWITCH  under REMOVAL & INSTALLATION.
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