Possible Causes
WARNING: This page is about a different car, the 2002 Lincoln Blackwood. However, it is still accessible from the selected car via links, so may be relevant.
A no communication with RCM condition could be caused by damaged wiring harness or connector, damaged DLC or RCM internal fault.
- Check RCM connector for damage
Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect harness connector C2041A. See RESTRAINTS CONTROL MODULE (RCM) under REMOVAL & INSTALLATION. Inspect component and harness side of RCM connector C2041A, terminal No. 5 (Light Blue wire, circuit No. 70) for damage. See Figure . If no damage is found, go to next step. If damage is found, repair or replace as necessary. Reconnect air bag system. Activate air bag system. See ACTIVATING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. - Check DLC for damage
Inspect DLC and DLC terminal No. 7 (Light Blue wire) for damage. See Fig 1 . If no damage is found, go to next step. If damage is found, repair or replace as necessary. Reconnect air bag system. Activate air bag system. - Check circuit for open
Measure resistance between harness side of RCM connector C2041A, terminal No. 5 and DLC terminal No. 7 (Light Blue wire). See Figure & Fig 1 . If resistance is less than 5 ohms, replace RCM. Reconnect air bag system. Activate air bag system. Clear all DTCs. See CLEARING FAULT CODES under DIAGNOSTICS. If resistance is more than 5 ohms, repair open circuit in Light Blue wire. See WIRING DIAGRAMS . Reconnect air bag system. Activate air bag system. Clear all DTCs.