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Manual Switch Circuit

NOTE: If using Lexus Hand-Held Tester (scan tool), start at step 1). If scan tool is not available, start at step 2).
  1. Connect Lexus Hand-Held Tester (scan tool) to DLC3. Turn ignition and tester on. Select DATA LIST mode on tester. Operate manual switch in each position and note voltage reading. See MANUAL SWITCH OPERATION PIN VOLTAGE table. If all voltages are as specified, go to TROUBLE SHOOTING and perform the next test listed. If all voltages are not as specified, go to step 2). If only one voltage is not as specified, replace switch.
  2. Remove tilt and telescopic control module and leave harness connectors connected. Turn ignition on. Check voltage between tilt and telescopic control module connector T9, terminals No. 6 (White/Black wire) and No. 5 (Purple/Yellow wire). See Figure. Operate manual switch in each position and note voltage reading. See MANUAL SWITCH OPERATION PIN VOLTAGE table. If all voltages are as specified, go to TROUBLE SHOOTING and perform the next test listed. If all voltages are not as specified, go to step 3). If only one voltage is not as specified, replace switch.
    MANUAL SWITCH OPERATION PIN VOLTAGE

    Switch Position (1) Voltage
    Neutral 0-.20
    Tilt Down .30-.50
    Telescopic Retract .65-.95
    Telescopic Extend 2.05-2.75
    (1) Approximate measured voltage.
  3. Check voltage between tilt and telescopic control module connector T9, terminal No. 2 (Purple wire) and ground. If voltage is not 4.5-5.5 volts, go to step 4). If voltage is 4.5-5.5 volts, turn ignition off. Disconnect manual switch 10-pin connector. Measure resistance between manual switch connector terminals No. 4 and No. 9. See Fig 1. Operate manual switch in each position and note resistance. See MANUAL SWITCH RESISTANCE table. If resistances are as specified, go to next step. If resistances are not as specified, replace tilt and telescopic manual switch.
    MANUAL SWITCH RESISTANCE

    Switch Position Ohms
    Telescopic Extend 160
    Tilt Up 360
    Telescopic Retract 790
    Tilt Down 1990
    Fig 1: Testing Manual Switch
    G97I08057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check and repair wiring harness between tilt and telescopic control module and manual switch connector. See WIRING DIAGRAMS. If wiring harness is okay, check tilt and telescopic control module. See TILT & TELESCOPIC CONTROL MODULE. Replace as necessary and retest system.
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