72V: CT-22 Display Setup and Wiring

This guide covers the CT-22 display used on the 72V ONYX RCR: everyday controls, troubleshooting, the annotated harness reference, advanced settings, and requirements for retaining the display during a Fardriver conversion.

Applicability: CT-22 documentation and wiring vary. This guide does not establish a tested model-year range, display hardware or firmware revision, or universal replacement-display pinout. Match the display and harness on your bike before using the wiring reference.

The bilingual CT-22 manual and Kelly CT-22 manual disagree on some button actions, even though both carry V1.1 and the date January 27, 2018. Their differences do not, by themselves, prove different firmware. This guide identifies those conflicts and keeps generic supplier examples separate from ONYX settings.

Quick Reference

The two buttons are on the left edge: ADJ above, SEL / SET below. This guide calls the lower button SET; the engineering drawing calls it SEL.

Holding ADJ for 3 seconds may reset the trip instead of opening clock adjustment. Record any trip reading you want to keep before testing an unresolved button action.

CT-22 Diagram Images

Select a thumbnail to enlarge it, then use the viewer controls to browse or zoom. Diagram numbers match the labels in the images.

Diagrams 2 and 3 reproduce the annotated harness reference; their use of “confirmed” does not establish independent testing of every connection. Diagram 4 contains 144V supplier examples, not 72V ONYX settings. Diagram 5 is an earlier illustration with a different screen layout; use diagrams 1 and 7 for the layout described here. Diagram 6 shows generic source-sheet circuits with different wiring assignments. Use the written source notes below when comparing these references.

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Everyday Controls and Display Layout

See diagrams 1 and 7 in the gallery .

The bottom indicator strip runs left to right: left turn, position / running light, ECO, NRM, SPT, high beam, and right turn. ECO means economy, NRM normal, and SPT sport. Turn, position-light, and mode symbols are green; high beam is blue.

A printed symbol does not establish that its input is connected. The annotated harness reference does not identify a dedicated NRM connection. READY is a display-status indication, but the source’s description of its zero-speed and flickering behavior is ambiguous.

Backlight brightness is fixed in both button manuals (bilingual manual, page 3; Kelly, page 2).

Set the Clock

These are alternative documented procedures, not verified instructions for identified ONYX firmware revisions. If the observed behavior differs, stop and identify the display before continuing. In particular, an ADJ hold can clear the trip according to the trip-reset instructions.

Bilingual Manual Procedure

Source: CT-22 Speedometer Button Function, page 1 .

1. With the display operating normally, hold ADJ for 3 seconds until the minutes flash.
2. Tap ADJ to increase minutes; hold it to scroll continuously.
3. Tap SET to select hours.
4. Tap ADJ to increase hours; hold it to scroll continuously.
5. Tap SET to save and exit. This final action is specified in the Chinese text.

Kelly Manual Procedure

Source: CT-22 Speedometer Button Instruction, page 2 .

Kelly describes holding ADJ while powering the display on, then using ADJ to increase minutes, SET to select hours, and ADJ to increase hours. Its wording is awkward: it also refers to normal display mode. The final save / exit action is not specified clearly. Treat this as an unresolved source instruction, rather than a complete procedure confirmed on an ONYX display.

Switch MPH / km/h

1. With the display operating normally, hold SET for 10 seconds to switch units.
2. Release the button.
3. Repeat to switch back.

Both manuals agree on this action (bilingual manual, page 2; Kelly, page 2). The panel supports MPH / mi and km/h / km. Recheck units after editing speed or distance parameters.

Reset Trip Meter

The instructions conflict even within the bilingual document:

No independently tested ONYX-specific result is documented here. Record the trip first; do not assume that a clock-adjustment or trip-reset instruction applies solely because the display looks the same.

Trip reset is separate from odometer adjustment. Codes 8810 and 6810 affect cumulative distance and are not routine trip-reset steps.

Troubleshooting

Connector labels below refer to the annotated harness reference , not a universal CT-22 pinout. Establish the actual connector view and functions before probing or connecting.

For power-distribution context, see the ONYX electrical system overview and ONYX wiring guide .

Annotated Harness Reference

Evidence, Labels and Connector View

The assignments below are transcribed from the annotated reference reproduced in diagram 2. Diagram 3 summarizes its circuit functions. The reference calls the pinout “confirmed,” but this article does not document the bike’s model year, display revision, original versus replacement status, or individual continuity and function-test results. Treat it as a reference to compare with the actual harness.

A6 means label 6 on reference connector A; B1 means label 1 on reference connector B. The numbers are used here as drawing reference labels. Their correspondence to any molded cavity numbers has not been established. Connector A’s labels run from 5 to 13 because they follow the reference’s numbering across both connectors.

Connector viewing side is unresolved. The tables reproduce diagram 2 with the latch at the top, but the available reference does not explicitly establish mating-face versus wire-side viewing. Those views reverse left and right. Do not use the position tables as a connection-ready pin map until the viewing side and assignments have been established on the physical connector. No matching, oriented connector photograph is available in this guide.

Before connecting, verify supply voltage, polarity, and the appropriate return for each circuit, especially B1–B4 and A5. Perform continuity checks only with power disconnected. A voltmeter reading alone does not prove a signal function or pulse characteristic; speed-input testing may require a frequency-capable meter or oscilloscope.

Port B: Power Connector

Reference connector designation: DJ7041A-2.8-21.

Drawing positions, latch at top; physical viewing side unverified:

Port A: Signal and Indicator Connector

Reference connector designation: DJ7091A-2.8-21.

Drawing positions, latch at top; physical viewing side unverified:

The reference describes the accessory circuit as 12V nominal. Diagrams 2 and 3 also print an accessory-voltage measurement without identifying the measurement points, operating state, or unit. That reading is not adopted here as a diagnostic target.

Circuit Functions

Diagram 3 is a functional explanation, not a physical routing drawing. Keep instrument and accessory returns identified separately; do not assume they are interchangeable or that every input comes directly from the controller.

Differences from Generic Supplier Wiring

Diagram 6 follows the generic engineering sheet. Its assignments differ from diagram 2:

The generic sheet’s table numbers must not be substituted for the annotated connector labels. See the original engineering diagram when comparing sources.

Advanced: Speed and Distance Parameters

This is a documented parameter reference. It does not supply verified ONYX defaults, a tested correction formula, or a recommended replacement value. A worked calibration example requires measurements from an identified display and pulse source; none is established here.

Check Accuracy Before Editing

1. Confirm a compatible, stable pulse signal and the selected MPH / km/h units.
2. Photograph or record the existing parameters.
3. Compare displayed speed with an independent reference at several steady speeds.
4. Check trip distance separately over a measured route.
5. Record conditions and results before deciding whether a parameter change is warranted.

Use the GPS performance-meter guide for comparison methods. One matching speed reading does not verify the full range. A stationary, jumping reading should be investigated as a signal problem before treating it as a calibration error.

Record Existing Settings

Record the bike, display label or revision if available, controller, pulse source, and units alongside this table. Fill in the original values before editing; no ONYX defaults are implied by the blank cells.

Enter Parameter Settings

Sources: bilingual manual, pages 3–5 , and Kelly manual, pages 2–3 .

1. With display power off, hold the lower SET button and apply power.
2. The documented screen is P-0000, with the rightmost digit flashing.
3. Tap SET to increase the selected digit from 0–9.
4. Hold SET to move to the next higher digit.
5. Complete the digits for 6610 to enter parameter settings.

6610 opens a menu containing speed, distance, and battery-gauge parameters. The separate codes 8810 and 6810 clear or set cumulative distance; the bilingual manual also states that setting cumulative distance clears the trip. They are not part of routine speed adjustment.

Speed and Distance Reference Values

These are examples, not verified ONYX factory values. The bilingual manual, page 5, prints an editable range of 0–9999; Kelly, page 3, prints 0–999. The documents do not resolve the actual installed firmware’s limits.

The bilingual manual, pages 9–10, describes the menu controls:

• Short press: advance to the next parameter while viewing the menu.
• Long press: enter editing of the selected parameter.
• While editing: short presses increment the flashing digit; long presses move left between digits.
• After editing the highest digit: long press to finish that parameter.

It describes exiting with a further short press at J-0030. For a speed-only edit, it also describes completing parameter 0, advancing to parameter 1, then powering off and restarting. Confirm that any edited value was retained.

Editing the stored frequency for the 60 km/h reference can switch the unit configuration to metric, according to the manuals. Recheck units, speed, and distance afterward. Determine the correction method and adjustment direction for the actual display before changing a value; this guide does not infer an ONYX calibration rule from the example frequency.

Battery-Gauge Parameters

The menu also includes battery thresholds and timing. No verified 72V ONYX threshold set is provided here. Preserve existing values unless the actual battery configuration and applicable display behavior are established. The high-voltage examples are available in the collapsed supplier reference below.

Fardriver Controller Compatibility

Supplier documentation shows a CT-22 integration path: the SiAECOSYS accessories manual, page 8 lists a Fardriver Conventional + CT22 harness. This is not evidence of a tested installation for each ONYX display, Fardriver model, firmware, and harness combination.

Here, retaining the display means preserving the functions below through suitable power and signal connections. This guide does not document a completed ONYX conversion demonstrating all of them.

The generic CT-22 drawing identifies a motor/controller Hall signal as the speed source. A controller-generated output is an alternative only after its electrical characteristics and configuration are checked. A one-line serial or analog speedometer output is not automatically interchangeable with a Hall pulse input.

The SiAECOSYS Fardriver parameter manual describes pulse-output options and hardware-dependent assignments. Use the sections for the actual controller hardware; this guide does not prescribe a universal pin, wire color, or setting. An encoder installation also needs an appropriate pulse source or interface rather than an assumed motor Hall connection.

Controller mode selection does not establish display-indicator wiring. See Fardriver display settings and telemetry for the distinction between display configuration and controller measurement calibration. If the conversion changes battery voltage, establish both the display’s supply rating and suitable gauge configuration before connecting it.

Supplier Specifications and Examples

These references describe supplier documents, not measurements of an identified ONYX display. Diagram 4 summarizes the engineering-sheet tables; diagram 6 shows its generic circuits.

Dimensions and Materials

The drawing also references Q/HTR-2007 for the harness, QC/T 417.1 through QC/T 417.5 for connectors/terminals, JB/T 8139 for wire, and QC/T 727 for instrument performance. These are source-sheet references, not an independent certification of the installed display.

Supplier Voltage Ratings

The SiAECOSYS instrument manual, pages 6–7 lists a CT-22 configuration with a 72V nominal rating and 33–144V supply range. Its wiring table also uses high-voltage labels and return descriptions that differ from the annotated harness. These entries do not establish the supply rating or wiring of every ONYX or replacement display. Check the actual unit before changing voltage.

Manuals and Source Notes

Page references use PDF page order. The locally hosted filenames identify downloads on this site; they do not establish ONYX authorship or approval of the underlying supplier documents.

The harness assignments and supplier specifications above are attributed references. An oriented connector photograph, an identified ONYX display with measured settings, and a tested conversion would be needed to resolve the remaining installation-specific questions.