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There are two illuminations in the hazard warning switch: the dashboard illumination, which is a bulb that is powered by the dimmed dashboard power and is part of the dash lighting, and an LED that turns on when the hazard warning lights are active.
The bulb in the Hazard Warning Switch is powered by the dimmer power for the dashboard. It's brightness is controlled by the interior light dimming. If the car sees daylight in the dashboard ambient light sensor under the rearview mirror at the front center of the dashboard, the lights aren't dimmed. If you put a clipboard over that sensor and wait a few seconds, or at night, the dash and interior lights are dimmed, and you have a control near the headlight switch to control the amount of dimming. If that works, there is no reason that the hazard warning switch illumination should not work too.
The LED, which is a lot brigher than the dashboard illumintion bulb, is in the same circuit as the signal to the BCM, a TN (probably tan) wire between the switch and the BCM. If it doesn't light, then either the hazard warnign switch is not connected to the BCM, or the BCM is not powering the switch circuit.
Any connection between the hazard warning switch and anything else in the car is through the BCM logic. There is no physical connection between the hazard warning switch and anything other than the BCM (except the dashboard illumination bulb). EXCEPT: the tan wire is on the same conector as the turn signal wires to the BCM, C1, which is a 27-terminal GN (green) connector on the BCM. From my SI DVD:
But since even my hszatd button doesnt light up which is located in the middle of the dash under the clock. Would a bad multifunction switch prevent my hazard button from lighting up??? Or would it at least still light up on the inside?
The Cadillac XTS V-Sport is a somewhat retro sedan that still has performance cred.
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As if the waters weren't cloudy enough I discovered this in the Owners manual....
(Stalk Disable): When Intellibeam™ has turned on the high-beams, pull or push the high-beam stalk. This will disable Intellibeam™. The Intellibeam™ indicator on the mirror will turn off. To re-enable Intellibeam™, press the Intellibeam™ button on the mirror.
Is the turn signal "Stalk" sloppy?
Is it possible to have a bad multifuction switch that is preventing my high beams turn sugnals and hazard lights from operating. ....even though my wipers still work perfectly which is located on the same multifunction switch???? Im lost on this issue