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Auto Set Switch Circuit

  1. Remove tilt and telescopic control module and leave harness connectors connected. With ignition off, measure voltage between tilt and telescopic control module connector T10, terminals No. 4 and No. 5. See Figure. With auto set switch on, voltage should be 10-14 volts. With auto set switch off, voltage should be less than one volt. If voltage is not as specified, go to next step. If voltage is as specified, go to TROUBLE SHOOTING  and identify next circuit to be checked.
  2. Disconnect combination switch connector. On SC300 models, measure resistance between combination switch connector terminals No. 7 and No. 8. See Fig 1 and Fig 2 . On SC400 models, measure resistance between combination switch connector terminals No. 2 and No. 6. With auto set switch on, resistance should be more than one megaohm. With auto set switch off, continuity should exist between measured terminals. If resistance is as specified, go to next step. If resistance is not as specified, replace tilt and telescopic combination switch and retest system.
  3. Check and repair wiring harness and connectors between tilt and telescopic control module and auto set switch. See WIRING DIAGRAMS . If wiring and connectors are okay, replace tilt and telescopic control module and retest system.
Fig 1: Testing Auto Set Switch (SC300 Models)
G97B08068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Testing Auto Set Switch (SC400 Models)
G97D08069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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