HAZARD SWITCH
DESCRIPTION
The hazard switch is located in the Accessory Switch
Bank Module (ASBM) just below the heater a/c con-
trols, in the instrument panel center stack. This switch
is the control for the hazard warning lighting. The only
visible component of the switch is the control push
button that is located just to the left of the Passenger
Airbag Disabled Light (PADL) indicator.
On BUX models, the hazard switch is located to the
left of the Headlamp Leveling Switch, in the ASBM.
The hazard switch cannot be adjusted or repaired. If
the switch is ineffective or damaged, the entire ASBM
must be replaced (Refer to 8 - ELECTRICAL/INSTRU-
MENT
CLUSTER/ACCESSORY
SWITCH
BANK
MODULE - REMOVAL).
OPERATION
The hazard switch features a push-push type latching push button. When the push button is in its latched (lowered)
position the switch contacts are open, and when the push button is in its unlatched (raised) position the switch
contacts are closed.
The hazard switch receives a ground on one terminal and provides a ground signal output to the Totally Integrated
Power Module (TIPM) ) whenever the switch contacts are closed. The TIPM responds to this input by controlling a
battery voltage output and the flash rate for each of the right and left turn signal lamps, then sends an electronic
hazard switch status message over the Controller Area Network (CAN) data bus to the ElectroMechanical Instru-
ment Cluster (EMIC) (also known as the Cab Compartment Node/CCN) to control the illumination and flash rate of
the right and left turn signal indicators, as well as to control the click rate of an electromechanical relay soldered
onto the EMIC electronic circuit board that emulates the sound emitted by a conventional hazard warning flasher.
The hazard switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional
diagnostic tools and procedures. Refer to the appropriate wiring information.
PM
LAMPS/LIGHTING - EXTERIOR - SERVICE INFORMATION
8L - 93