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Key Interlock System

  1. Disconnect 8-pin connector from interlock control unit. Interlock control unit is located behind passenger's side of instrument panel and contains an 8-pin connector. See Figure .
  2. Using ohmmeter, check for continuity between Black wire of 8-pin connector and ground. Continuity should exist. If continuity exists, proceed to step 4).
  3. If continuity does not exist, check for defective ground connection G402 or for open circuit in Black wire between interlock control unit and ground. Ground connection G402 is located behind kick panel on passenger's side.
  4. Ensure shift lever is in Park. Using ohmmeter, check for continuity between Green/White wire of 8-pin connector and ground. Continuity should exist. If continuity exists, proceed to step 7).
  5. If continuity does not exist, check for open circuit in Green/White wire between interlock control unit and shift position sensor. Shift position sensor is located on side of transaxle. See Figure . If Green/White wire is okay, proceed to step 6).
  6. Check for defective ground connection at shift position sensor. If ground connection at shift position sensor are okay, check shift position sensor. See SHIFT POSITION SENSOR  under COMPONENT TESTING.
  7. Turn ignition lock assembly to ACC position. Using voltmeter, check for battery voltage at White/Red and Blue/White wires of 8-pin connector and ground. Battery voltage should exist. If battery voltage exists, wiring circuit is okay.
  8. If battery voltage does not exist, check for defective No. 30 (20-amp) fuse in engine compartment fuse box. If fuse is okay, check for open circuit in White/Yellow wire between No. 30 fuse and key interlock switch and key interlock solenoid. Key interlock switch and key interlock solenoid are located on the ignition lock assembly. See Figure .
  9. If White/Yellow wire is okay, check key interlock solenoid. See KEY INTERLOCK SOLENOID  under COMPONENT TESTING. If key interlock solenoid is okay, check for open circuit in White/Red and Blue/White wires between key interlock solenoid and interlock control unit. Repair wiring as necessary.
Fig 1: Shift & Key Interlock System Schematic
G93I23760Courtesy of AMERICAN HONDA MOTOR CO., INC.
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