head lamp switch input circuit open

[jonathan greene]

I have the c code 23 and I'm trying to find the problem and no luck if anyone has any suggestions on how to figure it out or at least how to reset the code I appreciate it

 

[Redtruck-VA]

What exactly does the ccde read? C23 doesn't compute. Thats a tough circuit as it is a mixture of 5vdc sense signals involving the Instrument Cluster and IPM 12vdc. The multiswitch often has problems but that isn't proper trouble shooting to just jump on it. The multiswitch has a range of resistance values, as it grounds out the different resistances such as Hi beam low beam turn signal and such it signals the Instrument Cluster to activates relays to energize the different lights. If the lights are drawing amperage outside the predetermined values it will shut that circuit down making trouble shooting difficult. Do you have all OEM bulbs and/or any light added to th circuit that are not OEM?

 

[jonathan greene]

I did disconnect my bottom fog lamps and hooked them up to a fuse so that they will cut on and off as I choose

 

[jonathan greene]

Its just shows c code 23 -00 then 00-00 is there any way you know tht you could possibly reset the code I've unhooked the battery cables even had autozone reset everything just the code still remains

 

[jonathan greene]

I also have fog lights on my brush guard connected to a fuse in the fuse box

 

[Redtruck-VA]

What fuse did you piggtback? Maybe remove them until you get the current problem sorted out. Can anyone identify the DTC?

 

[jonathan greene]

I reconnected everything back the way it was b4 unhooked my fog lamps and reconnected the bottom fog lamps and still the code remains

 

[jonathan greene]

It says now when i hold the trip button down 23-08. 23 stands for headlamp switch input circuit open and the 08 stands for how many key cycles have passed since the code came up

 

[Redtruck-VA]

It says now when i hold the trip button down 23-08. 23 stands for headlamp switch input circuit open and the 08 stands for how many key cycles have passed since the code came up

Can you clear the DTC and then reboot the PCM? Then check for DTC's and then try the lights to see if the DTC returns.

 

[jonathan greene]

Yea already tried tht code still there

 

[jonathan greene]

I can get it to reset at 100 cycles and it just say c code 00- 00 but when I cut my headlights on when I crank it and my fog lamps and drive it comes back on saying the c code 23

 

[Redtruck-VA]

This is from the manual:

OPERATION
The multiplexed headlamp switch has an off, parking
lamp, fog lamp and a headlamp on position. High
beams are controlled by the multiplexed multifunction
switch on the steering column. The fog lamps
are illuminated by pulling back on the headlamp
switch knob when in the parking lamp or headlamp
ON position.The headlamp switch cannot be
repaired. It must be replaced.
The Instrument Cluster monitors the headlamp
and multifunction switch operation. When the headlamp
switch is rotated to the parking lamp or On
position the Instrument Cluster sends a J1850 message
to the Front Control Module, which is mated to
the power distribution center to become the Integrated
Control Module, to illuminate the appropriate
bulbs. When the multifunction switch is activated to
the optical horn or high beam position the Instrument
Cluster illuminates the high beam indicator
and sends a J1850 message to the Front Control
Module to illuminate the appropriate bulbs.

 

[Redtruck-VA]

Here is something more definitive: Do your headlights come on when the ignition is turned on? That would indicate a switch failure. More detail will require a scan tool.
HEADLAMP SYSTEM
The instrument cluster monitors both the multiplexed
headlamp and multifunction switches. The
instrument cluster transmits a J1850 bus message to
the front control module (FCM) to activate the headlamps.
The headlamp system will default to headlamps
ON position when ignition switch is ON and
when an open or short circuit failure occurs on the
headlamp switch input to the instrument cluster. The
system will return to normal operation when the
open or short is repaired. A fault will be reported by
the Instrument Cluster when a failure occurs on the
dimmer or headlamp switch input.

 

[jonathan greene]

Not sure its just strange to me I'll just replace the switch and see if that does anything I really do appreciate your help man