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Control Switch Test

NOTE: Horn and/or cruise control may operate intermittently if ground brush is missing.
  1. Check main feed fuse and brake lamp fuse. Replace if necessary. Remove steering wheel cover (horn pad on Aerostar series). With ignition off, connect an ohmmeter to White/Purple wire and to Black (Lt. Blue/Black on Aerostar) wire of switch connector at steering wheel. Depress "ON" switch.
  2. Ohmmeter should read 0-1 ohms. If reading is not correct, replace switch assembly. Remove steering wheel and clean brush assembly and slip rings with solvent and lubricate. Reinstall steering wheel. Connect ohmmeter to Lt. Blue/Black wire and to Black wire of switch connector. Depress remaining switches and check resistances against table. If values are not correct, replace switch assembly.
    CONTROL SWITCH RESISTANCES

    Switch Position Ohms
    "OFF" 0-1
    "SET ACCEL" 646-714
    "COAST" 114-126
    "RESUME" 2090-2310
  3. With ignition off, connect a voltmeter to Blue/Black wire of switch connector. Turn ignition switch to "ON" or "ACC" position. Voltmeter should read about 7.8 volts. Depress "ON" switch. Voltmeter should read approximately 12.0 volts.
  4. If voltages are correct, switches and wiring are okay. If either voltage reading is not correct, turn ignition off. Disconnect ground brush assembly from wiring harness and connect ohmmeter to White/Purple wire and Black wire at brush assembly pigtail.
  5. Depress "ON" switch. Ohmmeter should read 0-1 ohm. Turn steering wheel while keeping "ON" switch depressed. Check for fluctuations in reading. Connect ohmmeter to Lt. Blue/White and Black wire at brush assembly pigtail.
  6. Check for resistance values. See CONTROL SWITCH RESISTANCES table. Turn steering wheel while testing and check for fluctuations. If fluctuations are noted, remove steering wheel. Clean and lubricate brushes and slip rings. If no resistances are read, replace ground brush assembly.
  7. If resistances are correct and no fluctuations occur, switches and ground brushes are okay. If replacement of switch assembly does not produce correct results, check slip ring for shorts. If necessary, replace entire wheel assembly and retest.
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