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Home >> Lexus >> 1999 >> SC 300 >> Repair and Diagnosis >> Steering >> Steering Column >> Power Tilt Steering Column Systems >> Circuit Tests >> Sensor Power Source Circuit
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Sensor Power Source Circuit

  1. Turn ignition off. Remove tilt and telescopic ECU with wiring harness connector attached. Using a voltmeter, measure voltage by backprobing rear of 18-pin ECU connector T10 between terminals No. 17 (Red/White wire) and No. 5 (Brown wire). See Figure. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to step  3.
  2. Check wiring harness and connectors for an open between tilt and telescopic ECU, tilt and power telescopic unit (combination switch) and telescopic position sensor. See WIRING DIAGRAMS . Repair or replace as necessary. If wiring harness and connectors are okay, go to next test listed in SYMPTOM DIAGNOSIS  table under TROUBLE SHOOTING.
  3. Check wiring harness and connectors for a short between tilt and telescopic ECU, tilt and power telescopic unit (combination switch) and telescopic position sensor. See WIRING DIAGRAMS . Repair or replace as necessary. If wiring harness and connectors are okay, go to next test listed in SYMPTOM DIAGNOSIS  table under TROUBLE SHOOTING.
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