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

  1. Turn ignition switch to LOCK position. Disconnect REM harness connector C420b, located on right side of trunk compartment. Disconnect NGS tester (if connected). Inspect harness connector for loose, damaged or corroded terminals. If problem exists, repair harness connector as necessary and retest system for normal operation. If problem does not exist, go to next step.
  2. Connect REM harness connector C420b and connect NGS tester. 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 harness connector C420b. Disconnect NGS tester. Measure resistance between terminal No. 1 (Gray/White wire) at REM harness connector C420b and terminal No. 2 (Gray/Red wire) at Data Link Connector (DLC). 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 Auxiliary Junction Box (AJB) harness connector C283b, 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 terminal No. 16 at AJB harness connector C283b and terminal No. 1 at REM harness connector C420b. 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 AJB and REM. Retest system for normal operation.
  6. Disconnect AJB harness connector C283d, located behind left side of instrument panel. See Figure . Measure resistance between terminal No. 16 at AJB connector C283b and terminal No. 16 at AJB connector C283d (component side). See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace AJB and retest system for normal operation.
  7. Disconnect joint connector No. 4 harness connector C223, located behind left side of instrument panel. Measure resistance in Gray wire between terminal No. 12 at joint connector No. 4 harness connector C223 and terminal No. 16 at AJB harness connector C283d. 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 AJB and joint connector No. 4. Retest system for normal operation.
  8. Measure resistance between terminals No. 12 and 14 at joint connector No. 4 (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 harness connector C420b. Disconnect NGS tester. Measure resistance between terminal No. 2 (Blue/Orange wire) at REM harness connector C420b and terminal No. 10 (Blue/Red wire) at Data Link Connector (DLC). 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 Auxiliary Junction Box (AJB) harness connector C283b, 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 terminal No. 12 at AJB harness connector C283b and terminal No. 2 at REM harness connector C420b. 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 AJB and REM. Retest system for normal operation.
  12. Disconnect AJB harness connector C283d, located behind left side of instrument panel. See Figure . Measure resistance between terminal No. 12 at AJB connector C283b and terminal No. 12 at AJB connector C283d (component side). See Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace AJB and retest system for normal operation.
  13. Disconnect joint connector No. 4 harness connector C223, located behind left side of instrument panel. Measure resistance in Blue wire between terminal No. 11 at joint connector No. 4 harness connector C223 and terminal No. 12 at AJB harness connector C283d. 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 AJB and joint connector No. 4. Retest system for normal operation.
  14. Measure resistance between terminals No. 9 and 11 at joint connector No. 4 (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 C420b Terminals
G00011087Courtesy of FORD MOTOR CO.
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