Test B: No Communication With Rear Electronic Module (Rem)

WARNING: This page is about a different car, the 2000 Ford Windstar and 1999 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch to OFF position. Disconnect REM connectors. See Figure . Turn ignition switch to ON position. Using DVOM connected to ground, measure voltage between REM connector C343 terminal No. 3 (White/Yellow wire). See Figure . If reading is more than 10 volts, go to next step. If reading is 10 volts or less, locate and repair White/Yellow wire between Instrument Panel (I/P) fuse box and REM. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
NOTE: Light Blue/Red wire circuit in the following procedure may be a Tan/Red wire, on some models.
Measure voltage at REM connector C342 terminal No. 13 (Light Blue/Red wire). See Figure . Also, measure voltage at REM connector C344 terminal No. 4 (Light Blue/Red wire). See Figure . If readings are more than 10 volts, go to next step. If any reading is 10 volts or less, locate and repair Light Blue/Red wire between I/P fuse block and connectors C342 and C344. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
Turn ignition switch to OFF position. Disconnect REM connector C341. Measure resistance between ground and REM connector C342 Black wire terminals No. 11, 25 and 26. See Figure . If all readings are less than 5 ohms, go to next step. If any reading is 5 ohms or more, locate and repair open in appropriate Black wire between ground and REM.
Measure resistance between ground and REM connector C341 terminal No. 12 (Black wire). See Figure . If reading is less than 5 ohms, repair network concern. See MODULE COMMUNICATIONS NETWORK - WINDSTAR article. If reading is 5 ohms or more, locate and repair open in Black wire between ground and REM connector C341.