Gauges Self-Diagnostic Function (2/4-door) - Honda Civic FC/FK 2016-2021

Gauges Self-Diagnostic Function

The gauge control module has a self-diagnostic function which consists of the following checks:

	The indicator drive circuit check.
	The switch input check.
	The beeper drive circuit check.
	The LCD/MID segment check.
	The gauge drive circuit check (engine coolant temperature gauge, fuel gauge, and tachometer (without multi-information display)).
	The communication line check (of the body controller area network (B-CAN) communication line and the fast controller area network (F-CAN) communication line between the gauges).

NOTE: Indicators are also controlled via the communication lines.

Entering the Self-Diagnostic Function With the HDS

Using the HDS, select BODY ELECTRICAL, GAUGES, then FUNCTIONAL TESTS and do the self-diagnostic function.

Entering the Self-Diagnostic Function (Manual Method)

Before doing the self-diagnostic function, make sure the No. A18 (10 A) fuse in the under-hood fuse/relay box and the No. B7 (10 A) fuse in the under-dash fuse/relay box are OK.

1.	Push and hold the SEL/RESET knob.

2.	Turn the combination light switch to the PARKING position ().

3.	Turn the vehicle to the ON mode.

4.	Within 5 sec., turn the combination light switch to OFF, then to the PARKING position () and OFF again.

Within 5 sec., release the SEL/RESET knob, and then repeatedly push and release the knob three times.

NOTE:

	While in the self-diagnostic mode, the dashlights brightness controller operates normally.
	While in the self-diagnostic mode, the SEL/RESET knob is used to start the Beeper Drive Circuit Test and the Gauge Drive Circuit Check.
	If the vehicle speed exceeds 1.2 mph (2 km/h), or turn the vehicle to the OFF (LOCK) mode, the self-diagnostic mode ends.

The Indicator Drive Circuit Check

When entering the self-diagnostic mode, the following indicators (if equipped) blink:
12 volt charging system indicator, ABS indicator, ACC activation indicator, ACC indicator, automatic brake hold indicator, automatic brake hold system indicator, brake system indicator (amber), brake system indicator (red), CMBS indicator, cruise control indicator, cruise main indicator, door and trunk lid open indicator, ECON mode indicator, EPS indicator, fog light indicator, front seat belt reminder indicator, high beam indicator, left turn signal indicator, lights-on indicator, LKAS activation indicator, LKAS indicator, low fuel indicator, low oil pressure indicator, low tire pressure/TPMS indicator, maintenance minder indicator, malfunction indicator lamp (MIL), message indicator, press down brake indicator, RDM indicator, REV indicator, right turn signal indicator, security indicator, shift position indicator, sport mode indicator, SRS indicator, VSA indicator, VSA OFF indicator, and washer fluid level indicator.

Switch Input Check

At the initial stage of the self-diagnostic function, the beeper sounds intermittently. The beeper sounds continuously when any of the following switch inputs are switched from OFF to ON:
ACC combination switch, audio remote-HFL switch, automatic brake hold switch, CMBS OFF switch, cruise control combination switch, ECON switch, integrated drive-mode switch, km/h, mph change knob, TPMS switch, and VSA OFF switch.

The Beeper Drive Circuit Check

When entering the self-diagnostic mode, the beeper sounds five times.

The LCD/MID Segment Check

Without multi-information display: When entering the self-diagnostic mode, all the segments blink five times.

With multi-information display: When entering the self-diagnostic mode, the word ''CHECKING NOW'' shows on the multi-information display, and blinks five times.

The Gauge Drive Circuit Check

When entering the self-diagnostic mode, the tachometer (without multi-information display), the fuel gauge, and the engine coolant temperature gauge sweep from the minimum position to the maximum position, then return to the minimum position.

NOTE: After the beeper stops sounding and the gauge needles return to the minimum position, pushing the SEL/RESET knob starts the Beeper Drive Circuit Check (one beep) and the Gauge Drive Circuit Check again. The check cannot be started again until the gauge needles return to the minimum position.

Without Multi-Information Display

With Multi-Information Display

The Communication Line Check (Without multi-information display)

While in the self-diagnostic mode, the Communication Line Check starts after the LCD Segments Check.

If the communication line is OK, all segments will be indicated on the information display. If there is a communication line error, the word ''Error'' will be indicated on the information display.

Error Code List

Error code	Type of communication line(s) error
Error 1	F-CAN communication
Error 2	B-CAN communication
Error 12	F-CAN and B-CAN communication

Indication Example

	If Error 1 is indicated, there is a malfunction in the communication line between the F-CAN and the gauge control module. The B-CAN line is OK at this time. Check for DTCs in the F-CAN connected units and troubleshoot any DTCs.
	If Error 2 is indicated, there is a malfunction in the communication line between the B-CAN and the gauge control module. The F-CAN line is OK at this time.Check for DTCs in the B-CAN connected units and troubleshoot any DTCs.
	If Error 12 is indicated, there is a malfunction in the communication line between the gauge control module, the F-CAN, and the B-CAN. Check the DTCs in the F-CAN connected units and troubleshoot any DTCs.

The Communication Line Check (With multi-information display)

While in the self-diagnostic mode, the Communication Line Check starts after the MID Segments Check.

If the communication line is OK, the word ''OK'' will be indicated on the multi-information display. If there is a communication line error, the word ''ERROR'' will be indicated on the multi-information display.

Error Code List

Error code	Type of communication line(s) error
F-CAN???ERROR	F-CAN communication
B-CAN???ERROR	B-CAN communication

Indication Example

	F-CAN???ERROR: There is a malfunction in the communication line between the gauge control module and F-CAN. Check for DTCs in the PCM, and troubleshoot the indicated DTCs.
	B-CAN???ERROR: There is a malfunction in the communication line between the gauge control module and B-CAN. Check for DTCs in the body electrical system and troubleshoot the indicated DTCs.

Ending the Self-Diagnostic Function

Turn the vehicle to the OFF (LOCK) mode.

NOTE: If the vehicle speed exceeds 1.2 mph (2 km/h), the self-diagnostic function ends.