I was going to reset the trip odometer after an oil change and while I was holding the odo reset I realized that the ignition wasn't on. I switched the ignition on while holding the odo reset in and all of a sudden every dash light came on, all of the needles started through their full range stopping at every tick (speedo every 10 mph, tach every 1k rpm, etc.), and then some codes started coming across the odometer. AB 02, AC 02, AD 02, 00 00, etc.

What is all of this?

 

I ain't got a clue! but I'm interested! Never would think to hold the reset while turning the ignition on. What model truck is it?

 

2004 1500 5.7.

The exact sequence was.... (doors were closed and key was in the ignition in the off position)

Opened door and odometer lit up.

I pressed the trip odo switch then pressed it again and held it in to reset it.

While continuing to hold it in, I switched the key to the on position and the whole dash lit up and started this calibration or whatever it was.

 

The instrument cluster actuator test will put the instrument cluster into its self-diagnostic mode. In this mode the instrument cluster can perform a self-diagnostic test that will confirm that the instrument cluster circuitry, the gauges, and the indicators are capable of operating as designed. During the actuator test the instrument cluster circuitry will position each of the gauge needles at various calibration points, illuminate all of the segments in the Vacuum Fluorescent Display (VFD) units, turn all of the indicators on and off again, display any Diagnostic Trouble Code (DTC) information, and display the number of ignition key cycles that have occurred since the DTC was detected. It is suggested that a note pad and pencil be used to write down any fault information that is displayed during the test for reference.

Successful completion of the actuator test will confirm that the instrument cluster is operational. However, there may still be a problem with the PCI data bus, the Powertrain Control Module (PCM), the Engine Control Module (ECM), the Front Control Module (FCM), the Transmission Control Module (TCM), the Transfer Case Control Module (TCCM), the Airbag Control Module (ACM), the Controller Anti-lock Brake (CAB), or the inputs to one of these electronic control modules. Use a DRBIII® scan tool to diagnose these components. Refer to the appropriate diagnostic information.

Begin the test with the ignition switch in the Off position.
Depress the odometer/trip odometer switch button.
While still holding the odometer/trip odometer switch button depressed, turn the ignition switch to the On position, but do not start the engine.
Release the odometer/trip odometer switch button.
The instrument cluster will simultaneously illuminate all of the operational segments in both VFD units, perform a bulb check of each operational LED indicator. The VFD segments and LED indicators remain illuminated as each gauge needle is swept to several calibration points and back. If a VFD segment or an LED indicator fails to illuminate, or if a gauge needle fails to sweep through the calibration points and back during this test, the instrument cluster must be replaced. Following these tests, the actuator test will proceed as described in Step 6.
The text “C Code” is displayed in the odometer VFD for about three seconds. If there is no stored fault information, the display will show two pairs of zeroes in the format “00” “00”, which indicate that the display of fault information is done. If there is stored fault information, two sets of two-digit alpha and alpha-numeric fault codes will appear in the odometer display for a three second interval. The first pair of digits represents a Diagnostic Trouble Code (DTC), or fault code for the instrument cluster. The second pair of digits is a counter for the number of ignition key cycles that have occurred since the displayed DTC was set. The instrument cluster will continue to display additional sets of two pairs of digits at three second intervals until all of the stored codes have been displayed, which is again signaled by a code of “00” “00”. Refer to the Instrument Cluster Failure Message table for a description of each fault code that the instrument cluster displays.

INSTRUMENT CLUSTER FAILURE MESSAGE
Fault Code Description
01 Airbag warning indicator output circuit shorted.
02 Airbag warning indicator output circuit open.
03 ABS indicator output circuit shorted.
04 ABS indicator output circuit open.
05 MIL indicator output circuit shorted.
06 MIL indicator output circuit open.
07 Wait to start indicator circuit shorted.
08 Wait to start indicator circuit open.
23 Headlamp switch input circuit open.
24 Turn hazard switch input circuit shorted. .
25 Turn hazard swiitch inpot circuit open. .
27 Courtesy/dome output circuit shorted or open.
28 Glovebox/map lamp output circuit shorted or open.
29 Cargo lamp output circuit shorted or open.
40 Wiper switch input circuit shorted.
41 Wiper switch input circuit open.
42 Wash/beam input circuit shorted.
60 Passenger door lock switch input circuit shorted.
61 Passenger door lock switch input circuit open.
62 Passenger door lock switch input circuit stuck.
63 Driver door lock switch input circuit shorted.
64 Driver door lock switch input circuit open.
65 Driver door lock switch input circuit stuck.
66 All door lock output circuit shorted to ground or voltage.
67 All door unlock output circuit shorted to ground or voltage.
68 Driver door unlock output circuit shorted to ground or voltage.
6C Driver cylinder lock switch input circuit shorted.
6E Driver cylinder lock switch input circuit stuck.
80 Incorrect odometer value found.
81 Remote radio switch input circuit high.
82 Remote radio switch stuck.
A0 Internal module FLASH memory checksum failure.
A1 Internal module bootloader failure.
A3 Battery voltage open.
A5 TCCM messages not received.
A7 VIN checksum error.
A8 VIN previously stored.
A9 PCI bus internal failure.
AA PCM messages not received.
AB TCM messages not received.
AC ABS messages not received.
AD FCM messages not received.
AE ACM messages not received.
AF SKIM messages not received.
B0 RKE fob batteries low.
B1 RKE module communication link.
00 Done All Diagnostic Trouble Codes (DTC) have been displayed.


The actuator test is now completed. The instrument cluster will automatically exit the self-diagnostic mode and return to normal operation at the completion of the test, if the ignition switch is turned to the Off position during the test, or if a vehicle speed message indicating that the vehicle is moving is received from the PCM over the PCI data bus during the test.
Go back to Step 1 to repeat the test, if necessary.

 

Wow, thanks a ton for the info.

 

WOW! Now thats why I LOVE this site! It's hard not to learn something if you just read! Who would have thunk it that you would just stumble across something like that!

 

Hi Parts,
I checked my codes today cause I had a metal creating a short on my Headlamp switch. This is great info cause I got some codes and one was 23, the headlamp. But I also got 26 and I believe 21, which are not on your list. What could these be? I also still have the engine light on. Before I fixed the short yesterday, my cluster died on me and it showed "NO BUS". It did it a couple of times, but the truck did not die, it was fine except nothing worked on the panel. The last time it did it, the engine light stayed on. Code was u1055 I think. Anyway, it hasnt done it since yesterday and the panel works fine now, but the engine light still there. Any suggestions? Thanks.

 

psshhhh... i knew that :P