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HOMESERVICE MANUALSACURA2008RLREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESMULTIPLEX INTEGRATED CONTROL SYSTEMCOMBINATION SWITCH CONTROL UNIT INPUT TEST
2008 Acura RL

Combination Switch Control Unit Input Test

2008 Acura RLSECTION Combination Switch Control Unit Input Test
NOTE: Before testing, troubleshoot B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A  ).
  1. Turn the ignition switch ON (II), remove the driver's dashboard undercover (see DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ), and the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ), then remove the steering column covers (see STEERING COLUMN REMOVAL AND INSTALLATION ).
  2. Disconnect the 8P connector from the wiper/washer switch (combination switch control unit).
    Fig 1: Identifying Combination Switch Control Unit 8P Connector
    G05496800Courtesy 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, 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.
    CONNECTOR TERMINALS REFERENCE

    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)
    • An open in the wire
    8 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 7 (10 A) fuse in the driver's 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 (10 A) fuse in the driver's under-dash fuse/relay box
    • An open in the wire
  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.
    CONNECTOR TERMINALS REFERENCE

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    4 LTGRN Under all conditions Check for continuity between No. 4 terminal and the driver's under-dash fuse/relay box connector N (45P) No. 28 terminal:
    There should be continuity.    		 An open in the wire
    Under all conditions (Driver's under-dash fuse/relay box connector N (45P) disconnected) Check for continuity to ground:
    There should be no continuity.    		 A short to ground in the wire
RENDER: 1.0x

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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.