Document ID: chunk:federal_register_of_legislation:F2017L01229:body:0:p9
Version: federal_register_of_legislation:F2017L01229
Segment Type: other
Provision Reference: 
Character Range: 24116–27019

of 3,500 kg or less, and 1.52 m for vehicles with a maximum mass greater than 3,500 kg when computed 1.07 seconds after the Beginning of Steer (BOS). BOS is defined in paragraph 9.11.6.
7.3.1. The computation of lateral displacement is performed using double integration with respect to time of the measurement of lateral acceleration at the vehicle centre of gravity, as expressed by the formula:

 An alternative measuring method may be allowed for type approval testing, provided it demonstrates at least an equivalent level of precision as the double integration method.
7.3.2. Time t = 0 for the integration operation is the instant of steering initiation, known as the Beginning of Steer (BOS). BOS is defined in paragraph 9.11.6.
7.4. ESC malfunction detection
 The vehicle shall be equipped with a tell-tale that provides a warning to the driver of the occurrence of any malfunction that affects the generation or transmission of control or response signals in the vehicle's electronic stability control system.
7.4.1. The ESC malfunction tell-tale:
              7.4.1.1. Shall fulfil the relevant technical requirements of Regulation No. 121;
7.4.1.2. Except as provided in paragraph 7.4.1.3., the ESC malfunction tell-tale shall illuminate when a malfunction exists and shall remain continuously illuminated under the conditions specified in paragraph 7.4. for as long as the malfunction exists, whenever the ignition locking system is in the "On" ("Run") position;
7.4.1.3. Except as provided in paragraph 7.4.2., each ESC malfunction tell-tale shall be activated as a check of lamp function either when the ignition locking system is turned to the "On" ("Run") position when the engine is not running, or when the ignition locking system is in a position between "On" ("Run") and "Start" that is designated by the manufacturer as a check position;
7.4.1.4. Shall extinguish at the next ignition cycle after the malfunction has been corrected in accordance with paragraph 9.10.4.;
7.4.1.5. May also be used to indicate the malfunction of related systems/functions, including traction control, trailer stability assist, corner brake control, and other similar functions that use throttle and/or individual torque control to operate and share common components with ESC.
7.4.2. The ESC malfunction tell-tale need not be activated when a starter interlock is in operation.
7.4.3. The requirement of paragraph 7.4.1.3. does not apply to tell-tales shown in a common space.
7.4.4. The manufacturer may use the ESC malfunction tell-tale in a flashing mode to indicate ESC intervention and/or the intervention of ESC-related systems (as listed in paragraph 7.4.1.5.)
7.5. ESC Off and other system controls
 The manufacturer may include an "ESC Off" control, which shall be illuminated when the vehicle's headlamps are activated, and which has a purpose to place the ESC system in a mode in which it