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AirBag Laguna II 1.9 DCI Dynamique: Dashboard Indicator Light On, Replaced Components & Solutions

tomas1261 8523 18
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Why is the airbag warning light still on in a Laguna II after replacing the airbags, impact sensors, airbag module, and configuration, and how can I fix it?

The warning stayed on because the airbag controller itself had a damaged CAN H trace, specifically path 58, and repairing the solder joint/track on the airbag ECU board fixed it [#16722709] After that repair, the dashboard airbag light went out, the steering lock started working again when the card was removed, and the doors locked automatically while driving [#16722709] The earlier UCH errors and loss of steering lock/auto-lock were consequences of the airbag fault, not separate causes [#16716343] If the light remains, check the airbag module parameters/status and verify that the controller is shown as unlocked/inactive [#16716800]
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  • #1 16715988
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    Hello.
    Laguna II 1.9 DCI dynamique accident version (side curtain shot from the driver and seat cushion). After replacing the cushions, impact sensors, the AirBag module and the system configuration, the AirBag indicator on the dashboard is still lit (without the SERVICE indicator) although the system does not show any error, the steering lock (which cannot be diagnosed by CLIP) does not work, and automatic closing door while driving.
    I am asking for help in solving the problem
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  • #2 16716113
    sulof1601
    Level 26  
    Posts: 598
    Help: 94
    Rate: 280
    Hello. The module has the same designation as its predecessor or was the crasch was deleted? The lock does not work and the car starts?
  • #3 16716139
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    The module has been replaced with identical markings (this was done by car electronics). The car starts without any problems.
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  • #4 16716343
    milejow

    Level 43  
    Posts: 13047
    Help: 1558
    Rate: 5104
    What mistakes in UCH? Lack of blocking and locking after starting is a consequence of glowing airbag.
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #5 16716567
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    Errors in UCH:
    1. DF053 - Car speed information - 1.DEF
    2. DF052 - Receiver of signals sent by the pressure sensor - 1.DEF
    I can add screen parameters if it helps.
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  • #6 16716636
    milejow

    Level 43  
    Posts: 13047
    Help: 1558
    Rate: 5104
    There is no option that the cushion is lit for no reason, scan all the modules because there must be a bull somewhere. Option two - poorly made sensor.
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #7 16716727
    janek-krzysiek
    Level 11  
    Posts: 12
    Help: 2
    Rate: 2
    See if you can enter the parameters of the airbag system through a clip or other interface. You probably have a badly made driver. After an accident, in this lagoon, you need to "repair" the controller on the table. Once an experienced electronics technician told me that it is better to clean the old driver what was in the car than to configure a new one.
  • #8 16716745
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    You can enter the parameters of the AirBag system without any problem and configure it, but it doesn't do anything. Unfortunately, I don't have the old module anymore.
  • #9 16716770
    milejow

    Level 43  
    Posts: 13047
    Help: 1558
    Rate: 5104
    This is a new controller for the table and proven content inside.
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #10 16716798
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    In the week I will pull it out and program it again. I'll let you know how it went.
  • #11 16716800
    janek-krzysiek
    Level 11  
    Posts: 12
    Help: 2
    Rate: 2
    Find parameters such as controller status or controller lock in parameters. It should be "unlocked" l
    ub "inactive".
  • #12 16716816
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    Screenshots from the AirBag module
    AirBag Laguna II 1.9 DCI Dynamique: Dashboard Indicator Light On, Replaced Components & Solutions AirBag Laguna II 1.9 DCI Dynamique: Dashboard Indicator Light On, Replaced Components & Solutions AirBag Laguna II 1.9 DCI Dynamique: Dashboard Indicator Light On, Replaced Components & Solutions
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  • #13 16716849
    janek-krzysiek
    Level 11  
    Posts: 12
    Help: 2
    Rate: 2
    I would still try to look for an option that allows you to control the steering wheel lock with a computer and see if it can be done.
  • #14 16717031
    kamiloskop
    Level 23  
    Posts: 555
    Help: 42
    Rate: 278
    Take turn on the passenger airbag and see then !!!
  • #15 16717132
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    There is no on / off airbag switch on the passenger side
  • #16 16717208
    kamiloskop
    Level 23  
    Posts: 555
    Help: 42
    Rate: 278
    See in the parameters you have the passenger airbag blocked. I'm wrong, correct me
  • #17 16719149
    milejow

    Level 43  
    Posts: 13047
    Help: 1558
    Rate: 5104
    Which light is on because there are two. left-yellow or right-green?
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #18 16719158
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    The left yellow indicator is on.
  • #19 16722709
    tomas1261
    Level 10  
    Posts: 25
    Rate: 4
    The problem is solved, it turned out that the path in the AirBag driver is damaged, namely path 58 (CAN H), Clip sometimes showed that the multiplex network was damaged. After improving the soldering binder on the AirBag controller board and repairing the path, everything returned to normal, i.e. no indicator light, working steering lock after removing the card and locking the door when moving off. I attach demonstrative photos. Greetings to all and thank you for your interest in the topic. I consider the topic closed.
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    • IMG_20170926_180839.jpg (4.37 MB) You must be logged in to download this attachment.
    • IMG_20170926_180826.jpg (4.63 MB) You must be logged in to download this attachment.
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Topic summary

✨ The discussion revolves around a persistent AirBag indicator light issue in a Renault Laguna II 1.9 DCI Dynamique following an accident. Despite replacing the airbag cushions, impact sensors, and the AirBag module, the indicator remains lit without any error codes. Users suggest checking the UCH for errors, particularly related to car speed information and pressure sensor signals. The original poster confirms the module was replaced with an identical one and that the car starts normally. Further troubleshooting reveals a damaged path in the AirBag driver, specifically path 58 (CAN H), which was repaired, resolving the indicator light issue and restoring functionality to the steering lock and automatic door locking.
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FAQ

TL;DR: On a Laguna II 1.9 dCi, 1 damaged PCB trace (path 58/CAN H) kept the left yellow airbag light on; “everything returned to normal” after repairing the Airbag ECU track. [Elektroda, tomas1261, post #16722709]

Why it matters: This fix restores steering lock function and automatic door locking after crash repairs, preventing unnecessary parts swapping.

Quick Facts

How do I fix a Laguna II airbag light that stays on after crash repairs?

Inspect the Airbag ECU on the bench. Check the CAN lines for broken PCB tracks, especially path 58 (CAN H). Re-solder and repair the trace if open. Refit, clear faults, and verify the light goes out and body functions return. “Everything returned to normal” after this repair in the documented case. [Elektroda, tomas1261, post #16722709]

Does the airbag light disable the steering lock and auto door locking?

Yes. The forum diagnosis linked the lack of steering column locking and the absence of auto door locking to the illuminated airbag indicator. Restore the airbag system and those functions return. Scan UCH and Airbag to confirm. [Elektroda, milejow, post #16716343]

Which dashboard light is relevant—left yellow or right green?

The thread distinguishes two indicators on the cluster. The troubleshooting focuses on the left yellow light, which was illuminated in this case. Treat that as the fault signal to resolve first. This gives one clear target during diagnostics. [Elektroda, milejow, post #16719149]

What did Renault CLIP show before the successful repair?

CLIP intermittently reported a damaged multiplex network. That pointed toward a communication problem inside the Airbag ECU. The root cause proved to be an open CAN H track on the ECU PCB, fixed by solder repair. [Elektroda, tomas1261, post #16722709]

What UCH errors accompanied the airbag light in this case?

Two UCH codes were present: DF053 (vehicle speed information) and DF052 (pressure sensor receiver). Record such codes before hardware work. They help correlate body network behavior with SRS faults. [Elektroda, tomas1261, post #16716567]

Should I replace the Airbag ECU or clear crash data on the bench?

Experienced contributors recommend bench “repair/clean” of the original controller after an accident. “It is better to clean the old driver… than to configure a new one.” If you lack the old unit, validate the replacement’s internal state. [Elektroda, janek-krzysiek, post #16716727]

How can I check if the Airbag ECU is locked or active?

Use CLIP (or an equivalent tool) to view parameters like controller status or controller lock. Look for values such as “unlocked” or “inactive” where applicable. Confirm before further wiring or PCB work. [Elektroda, janek-krzysiek, post #16716800]

Can I command the steering lock with diagnostics to test it?

Yes. Look for an option in your diagnostic suite to actuate or control the steering lock. If the command works after SRS repair, it confirms the interdependency and that the network is healthy again. [Elektroda, janek-krzysiek, post #16716849]

What if my Laguna II has no passenger airbag ON/OFF switch?

That’s normal on some trims. Instead, check the passenger airbag status in the Airbag ECU parameters. Ensure it isn’t blocked or disabled in software during diagnostics and after repairs. [Elektroda, kamiloskop, post #16717208]

Could a bad impact sensor keep the airbag light on even after replacement?

Yes. A contributor warned, “There is no option that the cushion is lit for no reason,” noting a poorly made or faulty sensor as a possibility. Validate sensor wiring, resistance, and part quality. [Elektroda, milejow, post #16716636]

What does “path 58 (CAN H)” mean on the Airbag ECU?

It refers to the high line of the CAN communication trace on the ECU’s PCB. In the reported fix, that specific track was broken. Restoring conductivity reestablished network comms and cleared the indicator. [Elektroda, tomas1261, post #16722709]

How can I reproduce the successful diagnostic workflow?

Try this 3-step sequence:
  1. Scan SRS/UCH, save parameters and any network warnings.
  2. Remove the Airbag ECU; visually inspect and continuity-test CAN traces.
  3. Repair any open tracks (e.g., path 58/CAN H), refit, clear faults, road test. This mirrors the resolved case. [Elektroda, tomas1261, post #16722709]

What initial symptoms should I log before opening the ECU?

Note that the left yellow airbag indicator is on while the SERVICE lamp stays off. Also record if the car starts, steering lock behavior, and auto door locking status. Capture screenshots of parameters. [Elektroda, tomas1261, post #16715988]

Is the problem definitely inside the ECU if no DTCs appear in SRS?

Not always. Scan all modules because the fault can present elsewhere on the network. Still, internal ECU issues like a bad CAN trace can exist without SRS DTCs. Check both angles. [Elektroda, milejow, post #16716636]

Was the light confirmed as the left yellow indicator in the solved case?

Yes. The owner confirmed the left yellow lamp was the one illuminated during the fault. That aligns with the network issue found and repaired later in the Airbag ECU. [Elektroda, tomas1261, post #16719158]

After the fix, what confirms full system recovery?

Verify the airbag light is off, the steering lock engages when you remove the card, and doors auto lock on move-off. The poster reported these exact outcomes after repairing the CAN H track. [Elektroda, tomas1261, post #16722709]
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