Instrument Cluster Self-Diagnostic Mode

To enter the instrument cluster self-diagnostic mode with the engine off, simultaneously press and hold the message center RESET and SETUP buttons. Turn the ignition switch to the RUN position and hold until the display indicates TEST usually within 3 to 5 seconds. Press the reset button once to advance to each stage of the self-test.

To exit the instrument cluster self-test mode, turn the ignition to the OFF position. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.

INSTRUMENT CLUSTER SELF-DIAGNOSTIC MODE

Message center cluster display	Description
TEST	Initial entry display into self-test mode.
GAUGES SWEEP	Carries out gauge sweep of all gauges, then displays the present gauge values. Also carries out the checksum test on ROM and EEPROM.
All segments illuminated	Illuminates all odometer segments.
TEST TELLTALES	Illuminates all micro-controlled lamps and LEDs.
PART NUMBER, ####-10849-##	Displays alpha-numeric part number.
-	Suffix (last 2 digits of the part number are displayed as tow byte hexadecimal number).
######	Display serial number in decimal.
IGNITION KEY, #	Display key-in-ignition status.
ROM LEVEL ####, CHKSUM####	Returns to normal operation of all micro-controlled lamps and LEDs and displays hexadecimal value for read-only memory (ROM) level (used when requesting assistance from the hotline).
NVM LEVEL ##, CHKSUM####	Displays hexadecimal ROM level and type as stored in non-volatile memory (NVM).
dt ####	FINAL DATE, #### Displays hexadecimal coding of final manufacturing test date.
CF1-CF4	MODULE CONFIG, BYTE1-BYTE4=## Displays hexadecimal of bytes 1-4 of module configuration settings.
DIAG TROUBLE, CODE: ####	Displays a 16 bit DTC in hexadecimal format. DTCs displayed are those detected in continuous operation not during self-test.
VEHICLE SPEED, ###.# MPH	Displays English speed value being input, speedometer will indicate present speed.
VEHICLE SPEED, ###.# KPH	Displays metric speed value being input, speedometer will indicate present speed.
TACH VALUE, ####RPM	Displays the tachometer value being input to the instrument cluster. Tachometer will indicate present RPM.
FUEL LEVEL A/D, ###	Displays present fuel level analog/dual ratio input in decimal. The instrument cluster will indicate present fuel level.
FUEL LEVEL %, ###	Displays present fuel level percent status in decimal.
COOLANT TEMP, ###	Displays last temperature gauge input value from standard corporate protocol (SCP), temperature gauge will indicate present temperature.
ODO SCP INPUT, ###	Displays the odometer input received via standard corporate protocol (SCP), in decimal.
OIL PRESSURE, ###	Displays the last analog/dual reading of the oil pressure switch contact resistance, oil gauge will indicate present level.
BRAKE FLUID AD, #	Displays the brake fluid level received from the ABS module.
BATTERY VOLTS,	Displays present SBATT reading in 10th of volt.
PWM DIM STEP, ##	Displays dimming step in decimal.
PWM DIM INPUT, ###	Displays present hexadecimal pulse width modulation (PWM) dimming input in dimming steps.
PRNDL, ##	Displays hexadecimal value of PRNDL inputs packed into a single byte.
PARK BRAKE, #	Displays input status of the park brake switch.
DOOR AJAR, #	Displays input status of any/all door ajar input (U222 only).
LIFTGATE AJAR, #	Displays input status of liftgate ajar input.
SEATBELT, #	Displays input status of safety belt switch.
RUN/START, #	RUN/START sense circuit check.
RUN/ACC, #	RUN/ACC sense circuit check.
CHECK ENGINE, ###	Displays 8 bit hexadecimal value of SCP service engine soon malfunction indicator lamp (MIL) telltale command.
PORT A, B, E and J, ##	Displays 8-bit hexadecimal value for the ports A, b, E and G (base clusters) or J (message center clusters) readings (used when requesting information from the hotline).
PORTH, IB, P, Sand T, ##	Displays 8-bit hexadecimal value for the ports P, S, T, CAN, ADO and AD1 (base clusters) or H, IB, P, S, and T (message center clusters) in analog/digital readings (used when requesting information from the hotline).
PORTAD00-AD17	Displays 8-bit hexadecimal value for the ports ADOO-AD17 in analog/digital readings (used when requesting information from the hotline).