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Home >> Lexus >> 2004 >> LS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - Diagnosis >> Road Test

Road Test

  1. PROBLEM SYMPTOM CONFIRMATION 
    1. Inspect the SET function.
      1. Push the ON-OFF button on.
      2. Drive at the required speed (40 km/h (25 mph) or higher).
      3. Push the cruise control main switch to SET/COAST.
      4. After releasing the switch, check that the vehicle cruises at the set speed.
        Fig 1: Inspecting SET Function
        G03513855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the ACC (ACCEL) switch.
      1. Push the ON-OFF button on.
      2. Drive at the required speed (40 km/h (25 mph) or higher).
      3. Push the cruise control main switch to SET/COAST.
      4. Check that vehicle speed increases while the cruise control main switch is pushed to RES/ACC, and that the vehicle cruises at the newly set speed when the switch is released.
      5. Momentarily push the cruise control main switch to RES/ACC and then immediately release it. Check that vehicle speed increases by approximately 1.6 km/h (1.0 mph) (Tap-up function).
        Fig 2: Inspecting ACC (ACCEL) Switch
        G03513856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Inspect the COAST function.
      1. Push the ON-OFF button on.
      2. Drive at the required speed (40 km/h (25 mph) or higher).
      3. Push the cruise control main switch to SET/COAST.
      4. Check that vehicle speed decreases while the cruise control main switch is pushed to SET/COAST, and the vehicle cruises at the newly set speed when the switch is released.
      5. Momentarily push the cruise control main switch to SET/COAST, and then immediately release it. Check that vehicle speed decreases by approximately 1.6 km/h (1.0 mph) (Tap-down function).
        Fig 3: Inspecting COAST Function
        G03513857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Inspect the CANCEL function.
      1. Push the ON-OFF button on.
      2. Drive at the required speed (40 km/h (25 mph) or higher).
      3. Push the cruise control main switch to SET/COAST.
      4. When doing one of the following, check that the cruise control system is cancelled and that the normal driving mode is reset.
        • Depressing the brake pedal
        • Moving the shift lever to any position except D (6th, 5th, and 4th gears)
        • Pushing the ON-OFF button off
        • Pulling the cruise control main switch to CANCEL
          Fig 4: Inspecting CANCEL Function
          G03513858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Inspect the RES (RESUME) function.
      1. Push the ON-OFF button on.
      2. Drive at the required speed (40 km/h (25 mph) or higher).
      3. Push the cruise control main switch to SET/COAST.
      4. When doing one of the following, check that the cruise control system is cancelled and that the normal driving mode is reset.
        • Depressing the brake pedal
        • Moving the shift lever to any position except D (6th, 5th, and 4th gear)
        • Pulling the cruise control main switch to CANCEL
      5. After pushing the cruise control main switch to RES/ ACC at a driving speed of more than 40 km/h (25 mph), check that the vehicle restores the speed prior to the cancellation.
        Fig 5: Inspecting RES (RESUME) Function
        G03513859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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