Test A: No Communication With Rap Module
WARNING: This page is about a different car, the 1998 Mercury Mountaineer and 1998 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- Check Fuses
Turn ignition off. Check condition of instrument panel fuse block fuse No. 20 (7.5-amp) and engine compartment fuse block fuse No. 9 (20-amp). If fuses are okay, go to next step. If fuse(s) are not okay, replace fuse(s). Retest system operation. If fuse(s) fail again, check for short to ground in appropriate circuit and repair as necessary. See WIRING DIAGRAMS. - Check White/Light Blue Wire For Voltage
Disconnect RAP module 22-pin connector C338. RAP module is located behind left rear quarter panel. Using a voltmeter, check voltage between ground and RAP module 22-pin connector C338, terminal No. 12 (White/Light Blue wire). See Fig 1 . If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in White/Light Blue wire between RAP module and engine compartment fuse block. Retest system operation. - Check Black/Pink Wire For Voltage
Disconnect RAP module 26-pin connector C336. Turn ignition on. Measure voltage between ground and RAP module 26-pin connector C336, terminal No. 25 (Black/Pink wire). See Fig 2 . If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Black/Pink wire between RAP Module and instrument panel fuse block. Retest system operation. - Check Black/White Wire For Open
Turn ignition off. Measure resistance between ground and RAP module 22-pin connector C338, terminal No. 14 (Black/White wire). See Fig 1 . If resistance is less than 5 ohms, go to appropriate MODULE COMMUNICATIONS NETWORK article to continue diagnosis. If resistance is 5 ohms or more, repair open in Black/White wire between RAP module and ground. Retest system operation.