ANNEX XIII REQUIREMENTS TO ENSURE THE CORRECT OPERATION OF NO_x CONTROL MEASURES

4. DRIVER WARNING SYSTEM

4.1. The vehicle shall include a driver warning system using visual alarms that informs the driver when a low reagent level, incorrect reagent quality, too low a rate of reagent consumption, or a malfunction, has been detected that may be due to tampering and that will lead to operation of the driver inducement system if not rectified in a timely manner. The warning system shall also be active when the driver inducement system described in Section 5 has been activated.

4.2. The vehicle on-board diagnostics (OBD) display system described in Annex 9B to UN/ECE Regulation No 49 and referred to in Annex X to this Regulation, shall not be used for the purpose of providing the visual alarms described in Section 4.1. The warning shall not be the same as the warning used for the purposes of OBD (that is, the MI – malfunction indicator) or other engine maintenance. It shall not be possible to turn off the warning system or visual alarms by means of a scan-tool if the cause of the warning activation has not been rectified.

4.3. The driver warning system may display short messages, including messages indicating clearly the following:

(a)

the remaining distance or time before activation of the low-level or severe inducements;

(b)

the level of torque reduction;

(c)

the conditions under which vehicle disablement can be cleared.

The system used for displaying the messages referred to in this point may be the same as the one used for OBD or other maintenance purposes.

4.4. At the choice of the manufacturer, the warning system may include an audible component to alert the driver. The cancelling of audible warnings by the driver is permitted.

4.5. The driver warning system shall be activated as specified in Sections 6.2, 7.2, 8.4, and 9.3.

4.6. The driver warning system shall be deactivated when the conditions for its activation have ceased to exist. The driver warning system shall not be automatically deactivated without the reason for its activation having been remedied.

4.7. The warning system may be temporarily interrupted by other warning signals providing important safety-related messages.

4.8. A facility to permit the driver to dim the visual alarms provided by the warning system may be provided on vehicles for use by the rescue services or on vehicles in the categories defined in Article 2(3)(b) of Directive 2007/46/EC.

4.9. Details of the driver warning system activation and deactivation procedures are specified in Appendix 2.

4.10. As part of the application for type-approval under this Regulation, the manufacturer shall demonstrate the operation of the driver warning system, as specified in Appendix 1.