2008 Acura TSX StandardFACTORY OEM SERVICE PROCEDURE

Combination Switch Control Unit Input Test

  1. Remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
  2. Disconnect the 8P connector from the wiper/washer switch.
    Fig 1: Identifying Combination Switch Control Unit Connector (8P) Terminals
    G05492800Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. 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 4.
  4. Reconnect the connector to the wiper/washer switch, turn the ignition switch ON (II), 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, go to step 5.
      INPUT TEST CONDITION REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      3 BLK Under all conditions Measure the voltage to ground: There should be less than 0.5 V.
      • Poor ground (G501, G601)
      • An open in the wire
      8 WHT/RED(1) RED(2) Under all conditions Measure the voltage to ground: There should be battery voltage.
      • Blown No. 7 (10 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      7 YEL Ignition switch ON (II) Measure the 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
      (1) '04-05 models
      (2) '06-08 models
  5. Disconnect the 8P connector from the wiper/washer switch, 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 wiper/washer switch.
      INPUT TEST CONDITION REFERENCE CHART

      Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
      4 LTGRN Under-dash fuse/relay box connector X (39P) connector disconnected Check for continuity between terminal 4 and the under-dash fuse/relay box connector X (39P) connector No. 27 terminal: There should be continuity. An open in the wire
      Check for continuity to ground: There should be no continuity. Short to ground
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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