Test W: Air Bag Warning Chime Does Not Operate Properly
- Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below driver's side of instrument panel, right of steering column. Turn ignition switch to RUN position. Using NGS tester, perform Restraint Control Module (RCM) self-test. If no RCM DTCs exist, go to next step. If any RCM DTCs exist, repair air bag system as necessary. See lemon-25(R) AIR BAG SERVICE & REPAIR MANUAL, DOMESTIC & IMPORTED MODELS.
- Using NGS tester, monitor Generic Electronic Module (GEM) PIDs IGN_KEY, IGN_A, IGN_S and IGN_R while cycling ignition switch through all positions. If PIDs agree with ignition switch positions, go to next step. If PIDs do not agree with ignition switch positions, perform TEST V: KEY-IN-IGNITION WARNING CHIME DOES NOT OPERATE PROPERLY
.
- Using NGS tester, select GEM active command CHIME. Trigger active command CHIME on and off. If chime operates properly, go to next step. If chime does not operate properly, go to step 8
.
- Turn ignition switch to LOCK position. Disable air bag system. See appropriate AIR BAG RESTRAINT SYSTEMS article. Disconnect 26-pin RCM harness connector C276. RCM is located behind left center of instrument panel. Using NGS tester, monitor GEM PID ABCHIME. If PID indicates ON, go to next step. If PID does not indicate ON, go to step 6
.
- Ensure RCM harness connector C276 is still disconnected. Disconnect 26-pin Generic Electronic Module (GEM) harness connector C352. GEM is located behind left side of instrument panel, next to central junction box. Measure resistance between ground and GEM harness connector C352 terminal No. 10 (Light Blue/Black wire). See Figure
. If resistance is more than 10 k/ohms, go to step 8
. If resistance is 10 k/ohms or less, repair short to ground in Light Blue/Black wire between GEM and RCM. See WIRING DIAGRAMS in MODULE COMMUNICATIONS NETWORK - MUSTANG article.
- Ensure RCM harness connector C276 is disconnected. Disconnect 26-pin GEM module harness connector C352. GEM is located behind left side of instrument panel, next to central junction box. See Figure
. Measure voltage between ground and GEM harness connector C352 terminal No. 10 (Light Blue/Black wire). See Figure
. If voltage does not exist, go to next step. If voltage exists, repair short to voltage in Light Blue/Black wire between GEM and RCM. See WIRING DIAGRAMS in MODULE COMMUNICATIONS NETWORK - MUSTANG article.
- Measure resistance in Light Blue/Black wire between RCM harness connector C276 terminal No. 26 and GEM harness connector C352 terminal No. 10. See Figure
and Fig 1
. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Light Blue/Black wire between RCM and GEM. See WIRING DIAGRAMS in MODULE COMMUNICATIONS NETWORK - MUSTANG article.
- Disconnect all GEM harness connectors. Inspect all GEM harness connectors for loose, damaged or corroded terminals. If terminals are damaged, repair as necessary. If terminals are not damaged, reconnect all GEM harness connectors. Ensure GEM harness connectors are seated properly. If problem still exists, replace GEM. See REMOVAL & INSTALLATION
.
Courtesy of FORD MOTOR CO.