CK5
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Zimmers 06 LLY
- Thread starter 76zimmer
- Start date
Intermittent electronics...everyone's favorite issue to solve...
At least the guys have given you a solid lead with the dimmer and light sensor when it happens again. I hate those problems because sometimes you can't fix them until they completely stop working so you can diagnose it.
Those years seems to be BAD for electrical gremlins too.
Absurd amount of various grounds, little circuit boards that tie to each other for no apartment reason, etc.
My kids 04 was having a similar deal but his odometer readout and radio lights were coming on after the key was off.
Turned out to be a corroded micro chip on the back of the gauge cluster.
Replaced the cluster and it quit.
Reading on it it sounds like the dew from leaving windows down overnight and such can cause it.
That's the common belief anyway.
When we were chasing his limp mode issue I seemed to find a different ground every day.
Absurd amount of various grounds, little circuit boards that tie to each other for no apartment reason, etc.
My kids 04 was having a similar deal but his odometer readout and radio lights were coming on after the key was off.
Turned out to be a corroded micro chip on the back of the gauge cluster.
Replaced the cluster and it quit.
Reading on it it sounds like the dew from leaving windows down overnight and such can cause it.
That's the common belief anyway.
When we were chasing his limp mode issue I seemed to find a different ground every day.
Think it was the 03-04 years had major cluster issues. I remember my folks getting theirs replaced.
It makes sense that the dimmer knob didn’t make any change if the system was in night mode. It sounds backwards to say but the max brightness of the led readouts is in daytime mode. If you had that level of brightness at night it would be too much and distract you.
I’ve had the complaint come up many many times at the dealer. Didn’t matter if it was a car or a truck. If the light sensor doesn’t read correctly and assumes it’s dark out, the digital readouts get dimmed down together. Dash mats not positioned right, even tinted windows with the truck pointed away from the sun can trip it out.
I know you said nothing was on the dash so here is an easy check. All you need is a sheet of paper and a flashlight. Start the truck and hold it in gear with your foot on the brake. (Staying in park won’t allow the auto headlamps to work) take the sheet of paper and cover the sensor. It is then dome shaped thing in the center of the dash or other right side in or near the speaker grill. Give it 30 seconds to a minute and if you have the fan off and the radio off you’ll hear an audible “click” like a relay closing when the truck goes into night mode. You’ll notice the digital readouts drop dramatically in brightness. Backlighting should come on the dash and the buttons on the radio, hvac and door switches. Those all are hard to see in the day.
Take the paper away and give it 30 seconds to a minute to change back to daytime mode with the same audible click sound. If it doesn’t change back, take the flashlight and aim it right at the sensor. If f it doesn’t go into daytime mode with direct lighting on it, the sensor isn’t working.
Keep in mind setting the park brake defeats the auto headlamp system the mode won’t change with the park brake set.
It’s pretty simple figure it out. I’ve had some sensors take more than a minute to change. The spec I recall was 30-60 seconds to change mode in either direction. Taking longer to switch is not normal and may require replacing.
The light sensor seems to ne working as tested by your method. Turns on the backlight to the gauges and back off within 15 seconds, but has no effect on the odometer, radio or HVAC readouts.
The light dimmer dial seems to be a bit erratic. If the readouts go out again, I’ll try dialing that back and forth to see what happens.
The light dimmer dial seems to be a bit erratic. If the readouts go out again, I’ll try dialing that back and forth to see what happens.
While towing to Arkansas, after about 200 miles, the check engine light comes on.
put the reader on it and get this…
p0401-exhaust gas recirculation flow insufficient detected.
it cleared overnight, but came back after a couple hundred miles again, on while driving home.
time to do the EGR delete?
put the reader on it and get this…
p0401-exhaust gas recirculation flow insufficient detected.
it cleared overnight, but came back after a couple hundred miles again, on while driving home.
time to do the EGR delete?
Definitely delete time.
Deleted mine when I did head gaskets.
