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Sensor Power Source Circuit

  1. Turn ignition on. Remove tilt and telescopic ECU from its mounting, leaving wiring harness connector attached. Measure voltage by backprobing rear of 16-pin connector terminals No. 13 (Black/Blue wire) and No. 14 (Yellow wire). See Figure. Measure voltage by backprobing rear of 16-pin connector terminals No. 10 (White/Blue wire) and No. 12 (White/Red wire). If voltage is not 4.5-5.5 volts for both measurements, go to step  3. If voltage is 4.5-5.5 volts for both measurements, go to next step.
  2. Check wiring harness and connectors for an open circuit between 16-pin connector terminals No. 10 (White/Blue wire), No. 12 (White/Red wire), No. 13 (Black/Blue wire) and No. 14 (Yellow wire). 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 circuit between 16-pin connector terminals No. 10 (White/Blue wire), No. 12 (White/Red wire), No. 13 (Black/Blue wire) and No. 14 (Yellow wire). See WIRING DIAGRAMS . Repair or replace as necessary. If wiring harness and connectors are okay, check tilt and telescopic ECU. See TILT & TELESCOPIC ECU PIN VOLTAGE TESTS  under PIN VOLTAGE TESTS. Replace tilt and telescopic ECU as necessary and retest system operation.
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