Section 291 (Cruise Control Systems): Description

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Vehicle is equipped with Supplemental Inflatable Restraint (SIR) system. When servicing vehicle, use care to avoid accidental air bag deployment. SIR system related components are located in various locations throughout interior and exterior of vehicle, depending on application. Do not use electrical test equipment on or near these circuits. Before attempting ANY repairs involving steering column, instrument panel or related components, or If necessary, deactivate SIR system before servicing components. See AIR BAG SAFETY PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.

NOTE: For fuse locations, see FUSES & CIRCUIT BREAKERS article in ELECTRICAL.

System Outline

Cruise control is the speed control device, which sets the desired speed by just operating the switch on the control panel without pressing the accelerator pedal. This device is used when you would like to drive the vehicle at the fixed speed.

Set Control
If you operate the SET/COAST SW, see Fig 3, when driving (The available range of set speed between 40 and 200 km/h) with the main switch see Fig 1, On (when the power light comes on), see ,Fig 2, the device memorizes vehicles speed when switch is off and controls the fixed speed.
Set Speed Control
This device compares the vehicle's running speed and the memorized speed, and controls the driving power of the motor and the engine by calculating the cruise control requirements so that both speed becomes equivalent.
Coast Control
If the SET/COAST SW, see Fig 3, is continued to be ON during the running with cruise control, the device recognizes the cruise control requirement is at 0 and decelerates the vehicle speed. Then the device memorizes the speed when the switch is off in order to control the fixed speed.

In each time you operate SET/COAST switch momentarily (for about 0.5 second), the memorized speed is decreased in about 1.5 km/h. However, in case of the tap-down operation with more than 5-km/h gap between the memorized speed and vehicle's running speed, the device memorizes the vehicles running speed, the device memorizes the vehicle's speed when the switch is off and controls the fixed speed.
Accel Control
If the RESUME/ACCELL switch, see Fig 4, is continued to be on during the running with cruise control, the device recognizes the cruise control is on the acceleration side and accelerates the vehicles speed. Then the running speed when the switch is off is memorized to control the fixed speed.

In each time you operate RESUME/ACCELL switch momentarily (For about 0.5 second), the memorized speed is increased in about 1.5 Km/h. However, if there is more than 5-km/h gap between the memorized speed and vehicles running speed, this operation does not change the memorized speed. (Tap-up operation is not available).
Resume Control : If the running is faster than the low speed limit after the cruise control is canceled manually, the fixed speed is controlled by the OFF-ON operation of the RESUME/ACCELL switch, see Fig 4, so that the vehicles speed returns to the memorized speed at the time the cruise control is released.
Manual Cancel Control
When each of the following signals is input during cruise control, the cruise control is released with turning the cruise control requirement to 0. (The memorized speed is maintained when following signals except the signal, main switch OFF is input).
- Stop light switch ON. (Pressing the brake pedal).
- Control switch's cancel switch ON.
- Main switch OFF.
Auto Cancel Function
1. The memorized speed is erased and the control is canceled if the following conditions occur. The power indicator blinks at the time until the main switch is turned ON. The speed control is unavailable unless the main switch is turned On again.
  - When the stop light switch breaks or short-circuits.
  - When sudden change of the running speed signal occur.
2. The memorized speed is erased and the control is cancelled if the following conditions occur.
  - When the malfunction of the stop light switch input circuit occurs.
  - When the running speed becomes slower than 40km/h.
  - When the running speed becomes slower than the speed that 16 km/h subtracted from the memorized speed.
Regenerative System Operation
This system operates the motor as a generator to change the kinetic energy of the vehicle into the electricity when accel pedal release or foot braking controls the vehicle, and store the electricity in the battery.

Fig 1: Identifying Cruise Control On & Off Button (Main Switch)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Locating Cruise Control Components

Fig 3: Identifying Set/Coast Setting

Fig 4: Identifying Resume/Accel Setting