What is the reason why the air conditioning screen of Changan CS55 does not light up?

[OBlakely]

The specific reasons for the unlit air conditioning display screen of Changan CS55 include power supply abnormalities and poor contact. The detailed reasons are as follows: Power supply abnormalities: Check whether the power supply of the display screen is normal. If the power supply is abnormal, replace the power supply module. Poor contact: Check whether the cable connection is good. If there is poor contact in the circuit, it is necessary to promptly inspect whether there is a loose connection in the circuit, which causes the central control screen to go black. Simply reconnect the loose part properly. Display screen damage: Check whether the display screen is damaged. Replace the display screen for testing. If it returns to normal, the display screen is damaged. If the power supply is normal and the cable connection is good, check the video output signal of the motherboard and replace the motherboard for testing.

[SanGrant]

As a technician with over a decade of car repair experience, when encountering a non-illuminating CS55 AC screen, I usually first check the temperature on the back of the screen. If it's powered but not displaying, it's most likely a backlight failure, which requires replacing the entire screen assembly. If there's no response at all, focus on inspecting the F37 AC fuse in the dashboard's fuse box—use needle-nose pliers to pull it out and check against light; if blown, replacing it with a 15A fuse is very cheap. Also, a reminder: audio system modifications are most likely to tug on AC wiring harnesses. Just last week, a customer had just installed a subwoofer, resulting in poor contact due to displaced AC wiring. Don't ignore this issue—the worst case I've fixed was a customer's DIY attempt that burned out the AC control module, costing over two thousand more in the end.

[VanKeira]

Experienced two instances of AC screen blackout in three years of driving the CS55. The first time happened on a highway in summer when the screen suddenly went dark, but restarting the engine fixed it. Later, it was diagnosed as a sporadic system crash. Here's a handy tip: For Changan vehicles, simultaneously press and hold the steering wheel volume button and the AC switch for 10 seconds to force restart the infotainment system—it works most of the time. If this doesn't help, it's likely physical damage. Focus on checking the dual-row connector behind the AC panel—if you spot moisture during rainy days, use a hair dryer on low heat for three minutes. Last monsoon season, this trick saved me 800 RMB in repair costs. Also, wiring harnesses behind the glove compartment often get loosened by kicked feet.

[LaEleanor]

From a circuit perspective, there may be five key points: First, the fuse is blown. The blue 15A fuse located in the 3rd position from the left in the 7th row of the main driver's footwell fuse box is responsible for the screen power supply. Second, the CAN bus communication interruption causes signal transmission failure, which requires a diagnostic tool to read the fault codes. Third, the main control chip on the panel has overheated and triggered protection. Fourth, the display screen ribbon cable is loose. When disassembling the panel, use anhydrous alcohol to clean the gold fingers of the interface. Lastly, it might be a system crash of the car's infotainment system, which can be resolved by reinstalling the system at a 4S shop. It is recommended to prioritize reading the BSI fault codes. A common issue with this car model is module moisture. If the voltage at pin 1 of the panel interface measures below 11 volts with a multimeter, it is almost confirmed.

[MacViolet]

Veteran owner teaches you a three-step self-check: Don't rush to dismantle the center console. Start the engine and press the physical AC buttons to check for airflow. Cold air means the AC system works fine, it's just a display issue. Then turn off the engine, disconnect the negative battery terminal for five minutes before reconnecting - this trick solved my black screen issue three times. Finally, use your phone's flashlight to illuminate the screen edges; faint visibility indicates backlight failure. Replacing backlight strips is quite simple - buy 80-yuan adhesive LED strips from Taobao, just be careful not to break clips when removing panels. If none of these apply, keep a physical AC button diagram near the gearshift as backup. Most importantly - never peel off the screen's anti-glare film!

[TessaLee]

Helped my cousin deal with this issue before. For female car owners, focus on two key checks: First, see if the screen-off function was accidentally triggered—on Changan models, holding the air volume down button for five seconds can turn off the display. Then, check if the dashboard brightness knob was turned to the darkest setting. My cousin’s car had the knob turned to the lowest setting by a cleaner during car washing, and she thought the screen was broken. If a hardware issue is confirmed, a 4S store typically quotes around 800 for a full screen replacement, but a specialized auto repair shop in the parts market can do it for just 300. A money-saving tip: For out-of-warranty vehicles, look for used parts on Xianyu—the air conditioning panel for a CS55 costs only about 200 secondhand. Lastly, remember to turn off the AC before parking to prevent current surges from damaging the screen during the next cold start.