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Test F: No Module/Network Communications - ISO 9141 Network

NOTE: Depending on module configuration, with all modules connected and with ignition switch in RUN position or with engine running, 2-3 volts may be present at Data Link Connector (DLC) terminal No. 7 (Light Blue/White wire). This is the International Standards Organization (ISO) 9141 diagnostic communications network circuit.
  1. Turn ignition off. Inspect Data Link Connector (DLC) for physical damage, bent terminals or corrosion. Pay particular attention to terminal No. 7 (Light Blue/White wire). Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
  2. Deactivate air bag system. See AIR BAG RESTRAINT SYSTEMS article. Disconnect air bag diagnostic monitor connector located behind right kick panel. Measure resistance of Light Blue/White wire between terminal No. 19 at ECS module connector and terminal No. 7 at DLC. If resistance is less than 5 ohms, go to next step (if not equipped with 4WABS control module), or go to step  5 (if equipped with 4WABS control module).
  3. Turn ignition on. Measure voltage between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire) at DLC. See Figure. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire) at DLC. If either measurement indicates voltage, go to next step. If both measurements indicate zero volts, replace ECS module and retest system for normal operation.
  4. Turn ignition off. Disconnect Black 14-pin connector C201 located behind right kick panel. Turn ignition on. Measure voltage between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire) at DLC. See Figure. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire) at DLC. If either measurement indicates voltage, repair Light Blue/White wire between connector C201, connector C234 (if equipped with 4WABS control module) and DLC. Retest system for normal operation. If both measurements indicate zero volts, repair Light Blue/White wire between connector C201 and ECS module. Retest system for normal operation.
  5. Turn ignition on. Measure voltage between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire) at DLC. See Figure. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire) at DLC. If either measurement indicates zero volts, go to next step. If both measurements indicate voltage, replace ECS module and retest system for normal operation.
  6. Turn ignition off. Disconnect 4WABS control module 24-pin connector, located on left front frame rail. Turn ignition on. Measure voltage between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire) at DLC. See Figure. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire) at DLC. If either measurement indicates voltage, go to next step. If both measurements indicate zero volts, replace 4WABS control module.
  7. Turn ignition off. Disconnect 76-pin connector C234 (Natural) located on driver's side of engine compartment on firewall. Turn ignition on. Measure voltage between terminals No. 7 (Light Blue/White wire) and No. 16 (Light Green/Red wire) at DLC. See Figure. Also, measure voltage between terminals No. 4 (Black wire) and No. 7 (Light Blue/White wire) at DLC. If either measurement indicates voltage, go to step  4. If both measurements indicate zero volts, repair Light Blue/White wire between connector C234 and 4WABS control module connector. Retest system for normal operation.
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