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Test L: Rear Electronic Module Does Not Respond To NGS Tester

  1. Turn ignition switch to LOCK position. Disconnect Rear Electronic Module (REM) 22-pin harness connector C420b. REM is located on right side of trunk compartment. Disconnect New Generation Star (NGS) tester (if connected). Inspect harness connector for loose, damaged or corroded terminals. If problem does not exist, go to next step. If problem exists, repair harness connector as necessary and retest system for normal operation.
  2. Connect REM harness connector C420b. Connect NGS tester to Data Link Connector (DLC). DLC is located below driver's side of instrument panel, to right of steering column. Turn ignition switch to RUN position. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST  under SELF-DIAGNOSTIC SYSTEM. If NGS tester indicates REM: NO RESPONSE ON CKT 914 (BUS +), go to next step. If NGS tester indicates REM: NO RESPONSE ON CKT 915 (BUS -), go to step  9 .
  3. Turn ignition switch to LOCK position. Disconnect REM 22-pin harness connector C420b. Disconnect NGS tester. Measure resistance between REM harness connector C420b terminal No. 1 (Gray/White wire) and DLC terminal No. 2 (Gray/Red wire). See Figure and Fig 1 . If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, replace REM and retest system for normal operation.
  4. Disconnect interior Auxiliary Junction Box (AJB) harness connector C283b. See Figure . Interior AJB is located behind left side of instrument panel. See Figure . Inspect harness connector for loose, damaged or corroded terminals. If problem does not exist, go to next step. If problem exists, repair harness connector as necessary and retest system for normal operation.
  5. Measure resistance in Gray/White wire between interior AJB harness connector C283b terminal No. 16 and REM harness connector C420b terminal No. 1. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Gray/White wire between interior AJB and REM. Retest system for normal operation.
  6. Disconnect interior AJB 16-pin harness connector C283d. Measure resistance between interior AJB connector C283b terminal No. 16 and interior AJB connector C283d terminal No. 16 (component side). See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace interior AJB and retest system for normal operation.
  7. Disconnect 22-pin joint connector No. 4 harness connector C223. Joint connector No. 4 is located behind left side of instrument panel. Measure resistance in Gray wire between joint connector No. 4 harness connector C223 terminal No. 12 and interior AJB harness connector C283d terminal No. 16. See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Gray wire between interior AJB and joint connector No. 4. Retest system for normal operation.
  8. Measure resistance between joint connector No. 4 terminals No. 12 and 14 (component side). See Figure . If resistance is 5 ohms or less, repair open in Gray/Red wire between joint connector No. 4 and DLC. Retest system for normal operation. If resistance is greater than 5 ohms, replace joint connector No. 4 and retest system for normal operation.
  9. Turn ignition switch to LOCK position. Disconnect REM 22-pin harness connector C420b. Disconnect NGS tester. Measure resistance between REM harness connector C420b terminal No. 2 (Blue/Orange wire) and DLC terminal No. 10 (Blue/Red wire). See Figure and Fig 1 . If resistance is greater than 5 ohms, go to next step. If resistance is 5 ohms or less, replace REM and retest system for normal operation.
  10. Disconnect interior Auxiliary Junction Box (AJB) harness connector C283b. See Figure . Interior AJB is located behind left side of instrument panel. See Figure . Inspect harness connector for loose, damaged or corroded terminals. If problem does not exist, go to next step. If problem exists, repair harness connector as necessary and retest system for normal operation.
  11. Measure resistance in Blue/Orange wire between interior AJB harness connector C283b terminal No. 12 and REM harness connector C420b terminal No. 2. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Blue/Orange wire between interior AJB and REM. Retest system for normal operation.
  12. Disconnect interior AJB 16-pin harness connector C283d. Measure resistance between interior AJB connector C283b terminal No. 12 and interior AJB connector C283d terminal No. 12 (component side). See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace interior AJB and retest system for normal operation.
  13. Disconnect 22-pin joint connector No. 4 harness connector C223. Joint connector No. 4 is located behind left side of instrument panel. Measure resistance in Blue wire between joint connector No. 4 harness connector C223 terminal No. 11 and interior AJB harness connector C283d terminal No. 12. See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Blue wire between interior AJB and joint connector No. 4. Retest system for normal operation.
  14. Measure resistance between joint connector No. 4 terminals No. 9 and 11 (component side). See Figure . If resistance is 5 ohms or less, repair open in Blue/Red wire between joint connector No. 4 and DLC. Retest system for normal operation. If resistance is greater than 5 ohms, replace joint connector No. 4 and retest system for normal operation.
Fig 1: Identifying Rear Electronic Module Harness Connector Terminals
G00011087Courtesy of FORD MOTOR CO.
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