DTC 73, Led Display Dimming Output Circuit Shorted To Battery Or Or CCM Internal Open: Notes

CCM supplies ground for LED dimming output circuit in the form of a Pulse Width Modulated (PWM) output through LED dim control circuit. Power is supplied to LCD dim control circuit internally through headlight switch, radio control head and heater/air conditioning control head (if equipped with electronic heating/air conditioning).

DTC 73 will set when:

• Ignition 3 is on.
• Headlights and parking lights are on.
• PWM dimming control is not set for zero or 100 percent.
• No transition is captured over a specific time span at CCM terminal D2.
• PWM feedback shows a high logic state over the complete capture time.

When DTC 73 is set, SYS will flash. If LED dim control circuit is shorted to battery, LEDs will not operate.

DTC 73 will clear when:

• Ignition 3 is off.
• Headlights and parking lights are off.
• PWM dimming control is set for zero or 100 percent.
• A transition is captured over a specific time span at CCM terminal D2.
• PWM feedback does not show a high logic state over the complete capture time.