Toyota CH-R Service Manual: Precaution

Toyota CH-R Service Manual / Pre-collision / Pre-collision System / Precaution

PRECAUTION

IGNITION SWITCH EXPRESSION

(a) The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section.

Expression

Ignition Switch (Position)

Engine Switch (Condition)

Ignition Switch off

LOCK

Off (Lock)

Ignition Switch ACC

ACC

On (ACC)

Ignition Switch ON

ON

On (IG)

Engine Start

START

On (Start)

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

  • When disconnecting the cable from the negative (-) battery terminal, some systems must be initialize after the cable is reconnected.

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  • If the battery has been discharged and charged or the cable has been disconnected and reconnected to the negative (-) battery terminal, perform Steering Angle Sensor Zero Point Calibration.

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PRECAUTION BEFORE SERVICING

(a) Make sure to turn the pre-collision system off in the following situations, as it may operate unexpectedly or may not operate when necessary.

  • When the vehicle is being towed
  • When your vehicle is towing another vehicle
  • When transporting the vehicle via truck, boat, train or similar means of transportation
  • When the vehicle is raised on a lift with the engine running and the tires are allowed to rotate freely
  • When inspecting the vehicle using a drum tester such as a chassis dynamometer or speedometer tester, or when using an on-vehicle wheel balancer
  • When a strong impact is applied to the front bumper or front grille, due to an accident or other reasons
  • If the vehicle cannot be driven in a stable manner, such as when the vehicle has been in an accident or is malfunctioning
  • When the vehicle is driven in a sporty manner or off-road
  • When the tires are not properly inflated
  • When the tires are very worn
  • When tires of a size other than specified are installed
  • When tire chains are installed
  • When a compact spare tire or an emergency tire puncture repair kit is used
  • If the suspension is modified
  • If the front of the vehicle is raised or lowered, such as when loaded with heavy luggage

TROUBLESHOOTING PRECAUTIONS

(a) If a terminal contact malfunction or part installation problem occurs, removal and reinstallation of the suspected part may return the system to normal. However, be aware that the normal condition may only be temporary.

(b) Before disconnecting connectors or removing/installing parts, determine the malfunctioning area by checking and writing down the vehicle conditions (output DTCs, etc.) at the time the malfunction occurred.

(c) Be sure to check for DTCs related to other systems. The pre-collision system may be influenced by malfunctions in other systems.

HANDLING PRECAUTIONS

(a) When removing and installing ECUs, sensors, switches or other pre-collision system related parts, perform the following:

  • Make sure that the ignition switch is off unless otherwise specified in the procedure.
  • After removal/installation, check for DTCs and confirm that a normal system code is output.

REPLACEMENT PRECAUTIONS

(a) MILLIMETER WAVE RADAR SENSOR ASSEMBLY:

(1) When replacing the millimeter wave radar sensor assembly, replace it with a new one.

(2) If the millimeter wave radar sensor assembly has been replaced with a new one, be sure to perform Front Beam Axis Adjustment.

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(b) FORWARD RECOGNITION CAMERA:

(1) If the forward recognition camera has been replaced with a new one or the windshield glass has been removed and installed, it is necessary to perform forward recognition axis adjustment. If the system is turned on without performing forward recognition axis adjustment, DTC C1AA9 will be stored.

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(c) WINDSHIELD GLASS:

(1) When replacing the windshield glass of a vehicle equipped with a forward recognition camera, make sure to use a Toyota genuine part. If a non-Toyota genuine part is used, the forward recognition camera may not be able to be installed due to a missing bracket or the pre-collision system may not operate properly due to a difference in the transmissivity or black ceramic border.

(2) Do not attach stickers, including transparent stickers, or other items to the outer side of the windshield glass assembly within the area in front of the forward recognition camera.

    Pre-collision System
    ...

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    PARTS LOCATION ILLUSTRATION *1 FRONT SPEED SENSOR RH *2 FRONT SPEED SENSOR LH *3 REAR SKID CONTROL SENSOR RH *4 ...

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