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Home >> Lincoln >> 1998 >> Mark VIII Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panels - Analog >> Self-Diagnostic System >> Preliminary Procedure >> Electrical Inspection

Electrical Inspection

  1. Inspect electrical system for the following.
    • Blown Fuse(s). Fuse No. 5 (10-amp) Fuse No. 17 (10-amp) Fuse No. 20 (10-amp) Fuse No. 28 (10-amp)
    • Damaged Indicator Bulbs
    • Damaged Wiring Harness
    • Loose Or Corroded Connections
    • Damaged Switches, Sensors Or Modules
    • Damaged Vehicle Speed Sensor (VSS)
    • Damaged Instrument Cluster
  2. Verify charging system, fuel system, safety belt warning chime, turn signals, headlights and cruise control are working properly. Inspect wiring harness for obvious signs of shorts, opens, bad connections or damage.
  3. If all components are okay, connect NGS tester to DLC located below instrument panel. Using NGS tester, perform DATA LINK DIAGNOSTIC TEST. If NGS tester displays CKT 914 or CKT 915=ALL MODULES NO RESPONSE/NOT EQUIPPED, see MODULE COMMUNICATIONS NETWORK article to diagnosis network concern. If NGS tester displays NO RESPONSE/NOT EQUIPPED for hybrid electronic instrument cluster, go to NO COMMUNICATION WITH HYBRID ELECTRONIC INSTRUMENT CLUSTER (HEIC) under SYMPTOM TESTS. If NGS tester displays NO RESPONSE/NOT EQUIPPED for Steering Column Ignition Lighting Control (SCIL) module, go to NO COMMUNICATION WITH STEERING COLUMN/IGNITION/LIGHTING (SCIL) CONTROL MODULE under SYMPTOM TESTS.
  4. If NGS tester displays SYSTEM PASSED for HEIC, retrieve and record continuous DTCs using NGS tester. Erase continuous DTCs. Perform HEIC self-test diagnostics using NGS tester. If any HEIC DTC is retrieved, see HYBRID ELECTRONIC INSTRUMENT CLUSTER (HEIC) MODULE DTC DEFINITIONS table to continue diagnosis. If no DTCs are retrieved, perform appropriate test under SYMPTOM TESTS.
  5. If NGS tester displays SYSTEM PASSED for SCIL module, retrieve and record continuous DTCs using NGS tester. Erase continuous DTCs. Perform SCIL module self-test diagnostics using NGS tester. If any SCIL module DTC is retrieved, see STEERING COLUMN/IGNITION/LIGHTING (SCIL) MODULE DTC DEFINITIONS table to continue diagnosis. If no DTCs are retrieved, perform appropriate test under SYMPTOM TESTS.
    HYBRID ELECTRONIC INSTRUMENT CLUSTER (HEIC) MODULE DTC DEFINITIONS

    DTC Source Module Description
    B1342  HEIC (1) ECU Defective
    B1676  HEIC (1) Battery Voltage Out Of Range
    U1027 PCM (2) SCP Invalid Or Missing Data For Engine RPM
    U1041 ABS (3) SCP Invalid Or Missing Data For Vehicle Speed
    U1051 ABS (4) SCP Invalid Or Missing Data For Brakes
    U1059 PCM (2) SCP Invalid Or Missing Data For Transmission PRNDL
    U1073 PCM (5) SCP Invalid Or Missing Data For Engine Coolant
    U1123 ABS (3) SCP Invalid Or Missing Data For Odometer
    U1131 MC (6) SCP Invalid Or Missing Data For Fuel System
    U1136 ABS (3) SCP Invalid Or Missing Data For Telltales
    U1222 SCIL (7) SCP Invalid Or Missing Data For Interior Lights
    (1) See DIAGNOSTIC TESTS.
    (2) Check fuses No. 5 (10-amp), 17 (10-amp), 20 (10-amp) and 28 (10-amp) in fuse panel at driver's side end of instrument panel, near door opening. If any fuse is defective, replace fuse and recheck system operation. If fuses are okay, use NGS tester and check for continuous DTCs. Perform necessary tests for any DTCs.
    (3) Check fuses No. 20 (30-amp) and 21 (20-amp) in engine compartment fuse box at driver's side of engine compartment, near spring tower. Check fuse No. 21 (10-amp) in fuse panel at driver's side end of instrument panel, near door opening. If any fuse is defective, replace fuse and recheck system operation. If fuses are okay, use NGS tester and check for continuous DTCs. Perform necessary tests for any DTCs.
    (4) Check for damaged parking brake components. Repair if necessary. Check fuse No. 12 (15-amp) in engine compartment fuse box at driver's side of engine compartment, near spring tower. If fuse is defective, replace fuse and recheck system operation. If fuse is okay, use NGS tester and check for continuous DTCs. Perform necessary tests for any DTCs.
    (5) Proceed to step 80) under CIRCUIT TEST XB in TESTS W/CODES - EEC-V article in the ENGINE PERFORMANCE section.
    (6) Check fuses No. 4 (10-amp) and 20 (10-amp) in fuse panel at driver's side end of instrument panel, near door opening. If any fuse is defective, replace fuse and recheck system operation. If fuses are okay, use NGS tester and check for continuous DTCs. Perform necessary tests for any DTCs.
    (7) Check fuses No. 1 (10-amp), 5 (10-amp), 26 (15-amp) and 41 (10-amp) in fuse panel at driver's side end of instrument panel, near door opening. If any fuse is defective, replace fuse and recheck system operation. If fuses are okay, use NGS tester and check for continuous DTCs. Perform necessary tests for any DTCs.
    STEERING COLUMN/IGNITION/LIGHTING (SCIL) MODULE DTC DEFINITIONS

    DTC Source Module Description
    C1446 SCIL (1) Brake Switch Circuit Failure
    B1246 SCIL (1) Panel Dim Potentiometer Switch Circuit Failure
    B1312 SCIL (1) Headlight Input Circuit Short To Battery
    B1334 SCIL (1) Luggage Compartment Door Ajar Circuit Short To Ground
    B1342 SCIL (2) ECU Defective
    B1353 SCIL (1) Ignition Key-In Circuit Open
    B1360 SCIL (1) Ignition RUN/ACC Circuit Open
    B1364 SCIL (1) Ignition START Circuit Open
    B1446 SCIL (1) Wiper Park Sensor Circuit Failure
    B1485 SCIL (1) Brake Pedal Input Short To Battery
    B1490 SCIL (1) Door Handle Right Front Short To Ground
    B1498 SCIL (1) Luggage Compartment Door Punch Out Sensor Shorted To Ground
    B1509 SCIL (1) Flash-To-Pass Switch Circuit Short To Battery
    B1522 SCIL (1) Hood Switch Circuit Short To Ground
    B1562 SCIL (1) Door Lock Cylinder Short To Ground
    B1566 SCIL (1) Door Ajar Circuit Short To Ground
    B1600 SCIL (1) PATS Ignition Key Transponder Signal Is Not Received
    B1601 SCIL (1) PATS Received Incorrect Ignition Key Code From Ignition Key Transponder
    B1676 SCIL (1) Battery Voltage Out Of Range
    B1682 SCIL (1) PATS Is Disabled
    B1687 SCIL (1) Dome Light Input Circuit Short To Battery
    B1689 SCIL (1) Autolamp Delay Circuit Failure
    B1796 SCIL (1) Headlight Low Beam Circuit Short To Battery
    B1875 SCIL (1) Turn Signal/Hazard Switch Signal Circuit Failure
    B1980 SCIL (1) Bulb Outage Condition Detected
    B2328 SCIL (1) Steering Column Reach Feedback Potentiometer Circuit Failure
    B2332 SCIL (1) Steering Column Tilt Feedback Potentiometer Circuit Failure
    B2351 SCIL (1) Steering Column Switch Signal Circuit Failure
    U1027 PCM (1) SCP Invalid Or Missing Data For Engine RPM
    U1041 ABS (1) SCP Invalid Or Missing Data For Vehicle Speed
    U1057 SCIL (1) SCP Invalid Or Missing Data For Vehicle Configuration
    U1059 PCM (1) SCP Invalid Or Missing Data For Transmission PRNDL
    U1123 ABS (1) SCP Invalid Or Missing Data For Odometer
    U1147 PCM (1) SCP Invalid Or Missing Data For Vehicle Security
    U1180 DDM (1) SCP Invalid Or Missing Data For Memory Features
    U1181 DDM (1) SCP Invalid Or Missing Data For Memory Features
    U1197 DDM (1) SCP Invalid Or Missing Data For Door Locks
    U1198 DDM (1) SCP Invalid Or Missing Data For External Access Doors
    U1199 DDM (1) SCP Invalid Or Missing Data For External Access Doors
    U1211 DSM (1) SCP Invalid Or Missing Data For Restraints
    U1222 DDM (1) SCP Invalid Or Missing Data For Internal Lights
    (1) See PASSIVE ANTI-THEFT SYSTEMS article for testing procedures.
    (2) Using NGS tester, perform SCIL module Self-Test. If DTC B1342 is retrieved, replace SCIL module and retest system operation.
    NOTE: New Generation Star (NGS) Tester (007-00500) may be referred to as scan tool. All symptom tests are written specifically for the NGS tester but most scan tools should be able to perform all tests. See manufacturer's scan tool instructions.
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