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GMW16173
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GMW16173 3rd Edition, April 2019 Electronic Stability Control Performance - FMVSS 126 ESC Switch Mode and Driver Selected Vehicle Mode Compliance
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Description / Abstract:
Introduction
Note: Nothing in this standard supercedes applicable laws and regulations.
Note: In the event of conflict between the English and domestic language, the English language shall take precedence.
Purpose. To demonstrate compliance to Federal Motor Vehicle Safety Standard (FMVSS) 126 Electronic Stability Control Systems section 5.4 as follows:
S5.4 Electronic Stability Control (ESC) Off and Other System Controls. The manufacturer may include an “ESC Off” control whose only purpose is to place the ESC system in a mode or modes in which it will no longer satisfy the performance requirement of S5.2.1 (1.0 s yaw velocity ratio), S5.2.2 (1.75 s yaw velocity ratio) and S5.2.3 (1.07 s lateral displacement). Manufacturers may also provide controls for other systems that have an ancillary effect upon ESC operation. Controls of either kind that place the ESC system in a mode in which it will no longer satisfy the performance requirements of S5.2.1, S5.2.2 and S5.2.3 are permitted, provided that:
S5.4.1 The vehicle’s ESC system must always return to the manufacturer’s original default ESC mode that satisfies the requirements of S5.1 and S5.2 at the initiation of each new ignition cycle, regardless of what ESC mode the driver had previously selected, unless (a) the vehicle is in a low-range four-wheel drive configuration selected by the driver on the previous ignition cycle that is designed for low-speed, off-road driving, or (b) the vehicle is in a four-wheel drive configuration selected by the driver on the previous ignition cycle that is designed for operation hat higher speeds on snow-, sand- or dirt-packed roads and that has the effect of locking the drive gears at the front and rear axles together, provided that the vehicle meets the stability performance requirements of S5.2.1 and S5.2.2 in this mode.
S5.4.2 In addition to the requirements of S5.4.1, if the vehicles ESC system has more than one ESC mode that satisfies the requirements of S5.1 and S5.2 within the drive configuration selected of the previous ignition cycle, the system must return to the manufacturer’s original default ESC mode.
S5.4.3 As of September 1, 2011, a control whose only purpose is to place the ESC system in a mode or modes in which it will no longer satisfy the performance requirements of S5.2.1, F5.2.2 and S5.2.3 must be identified by the symbol shown for “ESC Off” in Table 1 of Standard No. 101 (49 Code of Federal Regulations (CFR) 571.101) or the text, “ESC Off” as listed under “Word(s) or Abbreviations” in Table 1 of Standard No. 101 (49 CFR 571.101).
S5.4.4 A control for another system that has the ancillary effect of placing the ESC system in a mode in which it no longer satisfies the performance requirements of S5.2.1, S5.2.2 and S5.2.3 need not be identified by the “ESC Off” identifiers in Table 1 of Standard No. 101 (49 CFR 157.101), but the ESC status must be identified by the “ESC Off” Telltale in accordance with S5.5, as of September 1, 2011, except if the vehicle is in a four-wheel drive high gear configuration that has the effect of locking the drive gears at the front and rear axles together provided the vehicle meets the stability performance criteria of S5.2.1 and S5.2.2.
Applicability. This procedure is applicable to passenger vehicles and light trucks up to 4535.9 kg Gross Vehicle Weight (GVW) sold in the United States.
Remarks. Not applicable.
Note: Nothing in this standard supercedes applicable laws and regulations.
Note: In the event of conflict between the English and domestic language, the English language shall take precedence.
Purpose. To demonstrate compliance to Federal Motor Vehicle Safety Standard (FMVSS) 126 Electronic Stability Control Systems section 5.4 as follows:
S5.4 Electronic Stability Control (ESC) Off and Other System Controls. The manufacturer may include an “ESC Off” control whose only purpose is to place the ESC system in a mode or modes in which it will no longer satisfy the performance requirement of S5.2.1 (1.0 s yaw velocity ratio), S5.2.2 (1.75 s yaw velocity ratio) and S5.2.3 (1.07 s lateral displacement). Manufacturers may also provide controls for other systems that have an ancillary effect upon ESC operation. Controls of either kind that place the ESC system in a mode in which it will no longer satisfy the performance requirements of S5.2.1, S5.2.2 and S5.2.3 are permitted, provided that:
S5.4.1 The vehicle’s ESC system must always return to the manufacturer’s original default ESC mode that satisfies the requirements of S5.1 and S5.2 at the initiation of each new ignition cycle, regardless of what ESC mode the driver had previously selected, unless (a) the vehicle is in a low-range four-wheel drive configuration selected by the driver on the previous ignition cycle that is designed for low-speed, off-road driving, or (b) the vehicle is in a four-wheel drive configuration selected by the driver on the previous ignition cycle that is designed for operation hat higher speeds on snow-, sand- or dirt-packed roads and that has the effect of locking the drive gears at the front and rear axles together, provided that the vehicle meets the stability performance requirements of S5.2.1 and S5.2.2 in this mode.
S5.4.2 In addition to the requirements of S5.4.1, if the vehicles ESC system has more than one ESC mode that satisfies the requirements of S5.1 and S5.2 within the drive configuration selected of the previous ignition cycle, the system must return to the manufacturer’s original default ESC mode.
S5.4.3 As of September 1, 2011, a control whose only purpose is to place the ESC system in a mode or modes in which it will no longer satisfy the performance requirements of S5.2.1, F5.2.2 and S5.2.3 must be identified by the symbol shown for “ESC Off” in Table 1 of Standard No. 101 (49 Code of Federal Regulations (CFR) 571.101) or the text, “ESC Off” as listed under “Word(s) or Abbreviations” in Table 1 of Standard No. 101 (49 CFR 571.101).
S5.4.4 A control for another system that has the ancillary effect of placing the ESC system in a mode in which it no longer satisfies the performance requirements of S5.2.1, S5.2.2 and S5.2.3 need not be identified by the “ESC Off” identifiers in Table 1 of Standard No. 101 (49 CFR 157.101), but the ESC status must be identified by the “ESC Off” Telltale in accordance with S5.5, as of September 1, 2011, except if the vehicle is in a four-wheel drive high gear configuration that has the effect of locking the drive gears at the front and rear axles together provided the vehicle meets the stability performance criteria of S5.2.1 and S5.2.2.
Applicability. This procedure is applicable to passenger vehicles and light trucks up to 4535.9 kg Gross Vehicle Weight (GVW) sold in the United States.
Remarks. Not applicable.