I've just replaced a Ford indicator unit which includes the hazard light switch. The old unit had an illuminated switch which flashed in unison with the indicators.
The new one is fully functional but the hazard light switch is not illuminated, so the only indication the hazards are working is the single indicator bulb on the instrument cluster and the audible relay.
Is this kosher? Is there any requirement that the switch must be illuminated as an additional signal to show the flashers are working?