Title: Canbus in Android9 Radio: Functions Not Working, Air Condition Settings & Updates

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What is the CAN bus in my Android 9 car radio, and how do I make functions like air conditioning settings work on the screen?

CAN bus is the car’s communication bus, and in this case the radio needs a CAN-bus adapter/module to translate signals between the Android unit and the car; without it, functions like vehicle data and air-conditioning control will not work properly. [#18668345][#18669948][#18828639] Check whether the radio actually has CAN L and CAN H wires and whether the correct CAN type is selected in the radio’s factory/settings menu, because some radios only have software loaded but no adapter installed. [#18826900] If the radio was sold as dedicated to a specific car model, it should come complete with the proper CAN-bus harness/adapter, and sometimes the air-conditioning panel appears on the touch screen only when that hardware is present and configured. [#18668785][#18826767][#18828639] Updating Android itself will not replace missing CAN hardware, so if the auction did not include the CAN module, you usually need to buy the matching adapter or return the unit. [#18669948][#18828639]

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#31 20921792 21 Jan 2024 20:58

darex120 darex120

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Post #31
20921792 21 Jan 2024 20:58

More specifically, I mean the steering wheel control and the display on the original LCD in the car, I read that a can bus is needed, so I guess it has it since the original radio control is there and the supposedly new radio also has it, the question is whether it will all work together
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#32 20921809 21 Jan 2024 21:02

milejow milejow

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20921809 21 Jan 2024 21:02

You won`t understand the display, you need an adapter for the remote control or a modification of the remote control - I have already written about this. The image to this display is sent using the old RGB signal, no one had heard of CAN back then. the ready interface for controlling the remote control has the symbol CTSRN003
Here is a link on how to modify this remote control for a Chinese invention
https://forum.renaultespace.pl/viewtopic.php?t=10617

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#33 20923614 22 Jan 2024 21:23

darex120 darex120

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Post #33
20923614 22 Jan 2024 21:23

Where can I find a diagram of this radio? I will probably only use the aux input from this old radio and leave the rest as it is.
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Topic summary

✨ The discussion revolves around issues related to the functionality of an Android 9 radio, specifically concerning CAN bus integration and air conditioning settings. Users highlight that the CAN bus is a communication system in vehicles that allows the radio to interact with the car's computer. Several responses suggest that the radio may require a dedicated CAN bus adapter for proper functionality, especially for features like air conditioning control and OBD integration. Users emphasize the importance of ensuring compatibility between the radio and the vehicle, as well as the necessity of having the correct wiring and settings configured. Some participants share experiences with different radio models and the challenges faced when replacing factory radios with aftermarket options, particularly regarding the retention of vehicle settings and features.

FAQ

TL;DR: CAN-bus harnesses can cost up to 100 % of a budget Android head-unit’s price [Elektroda, 60jarek, post #18828639] “Without CAN, you won’t have goodies” [Elektroda, 60jarek, post #18828639] Most display or power faults trace to 1) missing adapter, 2) wrong power pins, or 3) un-coded gateway.

Why it matters: A €25 wiring mistake or skipped adapter can disable A/C controls, steering-wheel keys and even cut engine data to the screen.

Quick Facts

• Budget Android 2-DIN price range: 300–700 PLN [Elektroda, 60jarek, post #18828639] • CAN-bus adapter/harness: 200–300 PLN, often equals radio cost [Elektroda, 60jarek, post #18828639] • Fully-equipped dedicated unit: ≈1000 PLN including CAN, DAB+, KEY loom [Elektroda, 60jarek, post #18828639] • Factory settings menu (Android 8.1): enter code, select car profile to enable CAN control [Elektroda, 60jarek, post #18826900] • OBD2 support needs extra Bluetooth dongle; gives live data and fault reset [Elektroda, adam_1991r, post #18669948]

What exactly is CAN-bus in a car radio context?

CAN-bus is a two-wire network (CAN-H / CAN-L) that carries ignition status, steering-wheel buttons, A/C data and more between the car’s ECUs and the head unit [Elektroda, madamsz1, post #18668345]

Do all Android head units need an external CAN-bus adapter?

No. Some new units integrate the translator, but most budget models sold on marketplaces still need a separate box; two users in the thread lost functions until they added one [Elektroda, 60jarek, #18826900; #18841742].

How can I check if my unit already has CAN support?

Look for a labelled CAN interface chip or a loose box on the main loom. In settings, enter the factory menu code; if a car-type list appears, the translator is on board [Elektroda, 60jarek, post #18826900]

My radio powers up in key position 0 but dies when the engine starts—why?

ACC (ignition) and B+ (constant 12 V) are swapped. Correct the two pins and the set will stay on [Elektroda, bassic, #18840952; #18841339].

Air-conditioning controls don’t show on screen—what fixes it?

The A/C panel needs B-CAN data. Plug in the correct Honda CAN adapter and select the Accord profile in factory settings; then the touch-A/C overlay reappears [Elektroda, milejow, post #18826767]

Can I retain steering-wheel buttons in a 2003 Renault Laguna II?

Yes, but not via CAN. The Laguna uses an analog stalk and RGB display. Fit interface CTSRN003 or re-wire per the linked modification guide [Elektroda, milejow, post #20921809]

Will the original dash LCD still show radio info?

Only if the interface converts the head-unit UART or RGB out to the car’s protocol. Most Chinese units lack this, so the LCD stays blank [Elektroda, milejow, post #20921809]

How do I add live engine data to the Android screen?

Buy an ELM327 Bluetooth OBD2 dongle. 2. Pair it in Android. 3. Open Torque or Car Scanner and select the adapter. Data such as RPM and coolant temp will stream instantly [Elektroda, adam_1991r, post #18669948]

Is coding the gateway mandatory on VW/Caddy after swap?

Yes. If the factory radio was removed, the gateway blocks power after a few seconds. Code the new radio’s presence and it stays on [Elektroda, bassic, post #18841582]

What’s an edge case where CAN won’t help at all?

Pre-2004 cars like early Laguna II send display data over analogue RGB; even a perfect CAN adapter won’t revive the top display [Elektroda, milejow, post #20921809]

How much extra should I budget for full functionality?

Add approx. 200 PLN for CAN harness, 120–200 PLN for DAB+, and 100 PLN for steering-wheel KEY interface—roughly a 60 % cost uplift [Elektroda, 60jarek, post #18828639]

Quick 3-step: enabling CAN after installation

Verify CAN-H/L pins and plug in the adapter. 2. In Factory Settings, enter the supplier code (often 8888). 3. Select car make/model, save and reboot. Functions appear immediately [Elektroda, 60jarek, post #18826900]