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Home >> Honda >> 2007 >> Ridgeline RT >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Multiplex Integrated Control System >> Combination Switch Control Unit Input Test
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Combination Switch Control Unit Input Test

NOTE: Check the No. 22 (120 A), No. 23 (50 A), No. 15 (40 A) fuse in the under-hood fuse/relay box before troubleshooting.
  1. Before troubleshooting the multiplex integrated control system, troubleshoot the B-CAN System Diagnosis Test mode A (see Troubleshooting - B-CAN System Diagnosis Test Mode A ).
  2. Turn the ignition switch OFF.
  3. Remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
  4. Disconnect the 12P connector from the combination switch
    Fig 1: Identifying Combination Switch Control Unit Connector Terminals
    G03691061Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Inspect the connector and socket terminals to be sure they are all making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step  6.
  6. Reconnect all the connector to the control unit, and make these input tests at the connector.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the combination switch control unit must be faulty, replace the combination switch.
      TEST CONDITION (5 OF 6)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      12 BLK Under all conditions Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G401)
      • An open in the wire
      7 WHT/RED Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 7 (7.5 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      1 YEL Ignition switch ON (II) Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      3 LT GRN Under all conditions Check for continuity between No. 3 terminal and the under-dash fuse/relay box connector X (39P) No. 27 terminal:
      There should be continuity.      		 An open in the wire
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