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VW Crafter 2.5 TDI 2011: Interior Lighting Issues, Cargo Space, 2 Error Codes B4 & 90B5

wacek 16536 15
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  • #1 16740698
    wacek
    Level 13  
    VW Crafter metal tin lack of interior lighting and cargo space.
    There is a constant weight in the cabin on the lamp, the lack of this after opening the door, the counter reacts to the opening of the door.
    Please help

    There are two mistakes:

    Address B4: Central electronic assembly
    Item designation SW: 9069027500 HW: 9069011400
    Service code: WSC 00000 000 00000
    ASAM dataset: 33,548
    ROD: CRFT_EZE_33_548.rod (*)
    VCID: 060963C5B9486F71D3-8052

    2 - number of errors found. Here they are:
    9042 - Front interior lighting (W1): short to positive
    Test completed - Active / saved
    90B5 - Fault 90B5: FNrSgDefekt_ShortCircCount (not supported)
    Test completed - Active / saved
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  • #2 16740732
    krzysiokal
    Level 13  
    As you can see from the errors you have a short circuit with a plus (+). You probably need to pull this plastic (housing) out of the headliner and check if there is a short circuit, similarly in the cargo area. Fuses would also be useful to peek before and after these attempts.
  • #3 16761579
    wacek
    Level 13  
    Light bulbs were a problem in the cargo space, but it is still "dark" in the cabin.
    All fuses checked.
    The lamp and bulb in the cabin are functional.
    There are three wires from the lamp:
    - permanent +12
    - constant mass
    - mass after opening the door or pressing "open" on the remote control.
    The beam from the lamp to the "SAM" checked.
    Errors are still the same, what do they mean? is the "SAM" module to be replaced?
  • #4 16763515
    krzysiokal
    Level 13  
    If you replace ordinary bulbs for LEDs (the cheapest), you'll always have errors because you have attached detection of defective bulbs. I don't understand your statement very much. If they go from a functional bulb in the cab, then release from the battery through the fuse directly to these bulbs and after the problem.
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  • #5 16769229
    wacek
    Level 13  
    Did I write anything about leds?
    Why should I give additional "permanent" power supply through a fuse, if I have it?
    If you don't know what the "SAM" module is, you don't know what I'm writing about.
  • #6 16769788
    sk700
    Level 31  
    Set the lamp switch to the constant light position and check with the meter whether there is a short circuit, if not the same for substitution and there is nothing to debate. I am writing about checking in this way because you did not specify what measurements you made and whether it was not just a circuit continuity test.
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  • #7 16770458
    wacek
    Level 13  
    I unplugged the plug from "SAM" which has three wires:
    +12 - goes to the front and back lights
    front lamp weight
    rear lamp weight

    I gave the power supply from the rectifier there, and the lamp works, which indicates that the "SAM" module is damaged.
    I found a translation of the errors in the twin MB Sprinter 906:

    (9042) Front interior light-The function is implausible.
    (90B5) N10 (SAM control unit) -Status of output stage Implausible value.
  • #8 16770519
    sk700
    Level 31  
    For the sake of peace, replace the light bulb so that it does not turn out that it simply draws too much current, which SAM interprets as a short circuit and how to change the module. You can still dismantle the current one and look at the current control system in this circuit because the increased resistance in the shunt circuit can cause such results but is it worth it? It's up to you :)
  • #9 16770695
    wacek
    Level 13  
    As the first I changed the bulb, I also connected the indicator and meter in place of the bulb, with no effect.
    Can this module be replaced without additional operations? assuming that I can get the same numbers.
  • #10 16770923
    sk700
    Level 31  
    For the diagnosis of damage, you can replace, if you want to replace it would suit to code the equipment.
  • #11 17302597
    bartex0
    Level 11  
    I have the same problem with the same module. Adjusting the electric mirrors do you work? Next week I will try to fix it
  • #12 17451491
    pawko122
    Level 2  
    bartex0 wrote:
    I have the same problem with the same module. Adjusting the electric mirrors do you work? Next week I will try to fix it

    what's up? could you find something? what cause? Regards
    Paul
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  • #13 17451743
    bartex0
    Level 11  
    Unfortunately, the customer had to take the car, I think I will look into it, car almost on the road ... I will definitely write. Tell me if the mirror adjustment works for you
  • #14 17452431
    pawko122
    Level 2  
    bartex0 wrote:
    Unfortunately, the customer had to take the car, I think I will look into it, car almost on the road ... I will definitely write. Tell me if the mirror adjustment works for you

    I have mirrors control.
    I have this symptom:
    lighting does not work automatically: i.e. when I release the light with a button it comes on, and something else: on the dashboard after a while the yellow light turns on - as if a light bulb burned somewhere in the car ... but I don't know how check because there are a lot of them ...
  • #15 18056492
    krzy0
    Level 12  
    Hello
    I have exactly the same problem as my friend Wacek or maybe someone found a solution.
  • #16 19462408
    pastylutza
    Level 1  
    wacek wrote:
    As the first I changed the bulb, I also connected the indicator and meter in place of the bulb, with no effect.
    Can this module be replaced without additional operations? assuming that I can get the same numbers.


    Hello!
    I have the same problem with the crafter with the interior lights that do not work when the doors open. They only work when I manually turn on the button.
    Can you please tell me how you solved this problem?
    Thank you
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Topic summary

✨ The discussion revolves around interior lighting issues in a 2011 VW Crafter 2.5 TDI, specifically the malfunction of lights in the cabin and cargo area, alongside two error codes: B4 (Central electronic assembly) and 90B5 (SAM control unit fault). Users suggest checking for short circuits in the wiring and fuses, as well as the functionality of the SAM module. The original poster confirmed that the bulbs are functional and that the SAM module may be damaged, as indicated by the error codes. There are also mentions of potential solutions, including replacing the SAM module and ensuring proper wiring connections. Several users report similar issues, indicating a common problem with the model.
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FAQ

TL;DR: VW Crafter/Sprinter cabin light faults often trace to the SAM output stage; this case showed 3 lamp wires and “the lamp works” on external 12 V. [Elektroda, wacek, post #16770458]

Why it matters: This FAQ helps Crafter 2.5 TDI owners diagnose no‑interior‑light issues without guesswork or unnecessary parts swaps.

Quick Facts

What do error codes 9042 and 90B5 mean on a VW Crafter 2.5 TDI?

9042 flags an implausible front interior light function. 90B5 reports the SAM (N10) output stage with an implausible status. Together they point to a control‑side fault, not necessarily the bulb. One owner translated these codes from the Sprinter 906 twin, which shares the SAM logic. [Elektroda, wacek, post #16770458]

How can I confirm the SAM module is the culprit for no cabin light?

Isolate the lamp feed at the SAM connector with the three related wires. Apply a stable external 12 V to the lamp circuit. If the dome light illuminates, the lamp and wiring are good, and the SAM output stage is suspect. As one tester noted, “the lamp works” when powered directly, indicating internal SAM failure. [Elektroda, wacek, post #16770458]

How do I check the interior light circuit with a multimeter?

Set the lamp switch to the constant‑on position. Measure for a short from the lamp feed to battery positive, not just continuity. If no short appears, substitute a known‑good lamp and retest. This separates wiring and load faults from SAM control faults during diagnosis. [Elektroda, sk700, post #16769788]

Can I just replace the SAM without coding?

You can swap the SAM to confirm damage. For a permanent replacement, plan to code the equipment so the new unit matches the vehicle configuration. This ensures all supervised loads and features behave correctly after installation. [Elektroda, sk700, post #16770923]

Do LED bulbs cause interior light errors on Crafter/Sprinter?

Yes. Low‑cost LEDs can trip the bulb‑out detection and mimic a short‑to‑positive condition. If LEDs are installed, refit a standard bulb or use CAN‑bus‑compatible LEDs with proper load. “You’ll always have errors” when detection is active and load is too low. [Elektroda, krzysiokal, post #16763515]

My cargo lights now work after bulb changes, but the cabin lamp stays dark. What next?

Verify fuses again, then focus on the cabin lamp control path. The user with this symptom had a good lamp and fuses, with three wires present. That narrowed the fault to the SAM‑controlled ground path for door/remote activation. Test at the SAM connector or substitute power to confirm. [Elektroda, wacek, post #16761579]

What wires feed the front dome lamp on this vehicle?

+12 V constant supply, a constant ground, and a switched ground that goes active with door opening or remote unlock. Knowing these helps you meter the circuit and separate supply issues from SAM‑controlled switching faults. [Elektroda, wacek, post #16761579]

Why does my light work with the button but not when I open the door?

Manual switch forces the lamp on, bypassing the door‑triggered ground path. If door‑open activation fails, suspect the SAM’s supervised output stage or its logic. Several owners report manual‑only lighting with door‑trigger failure. [Elektroda, pastylutza, post #19462408]

Is a short to positive likely here, and how do I verify it?

The scan shows a short‑to‑positive flag. Pull the lamp housing, visually inspect for chafing, and meter the feed while the switch is at constant light. Check fuses before and after testing. This approach verifies a genuine short versus a control‑stage interpretation. [Elektroda, krzysiokal, post #16740732]

Are the electric mirrors related to the interior light fault?

One report shows mirror adjustment working while the interior light automation failed. That suggests the mirror circuit is separate from the failing SAM output stage. Do not assume mirrors will fail with the dome light issue. [Elektroda, pawko122, post #17452431]

What is the SAM module on Crafter/Sprinter?

SAM is the Signal Acquisition and Actuation Module. It supervises loads like interior lights and reports implausible output states. In the Sprinter 906 twin, it’s referenced as unit N10, aligning with the error translations used for diagnosis. [Elektroda, wacek, post #16770458]

How do I rule out the lamp and wiring in three quick steps?

  1. Set the dome switch to constant light.
  2. Measure for shorts with a meter, not just continuity.
  3. Substitute a known‑good bulb and retest. These steps isolate load and wiring before condemning the SAM. [Elektroda, sk700, post #16769788]

Could a high‑draw bulb mimic a short and trigger SAM protection?

Yes. An over‑current bulb or poor shunt sensing can look like a short. One advisor recommended replacing the bulb first to avoid misdiagnosis and possibly inspecting the current‑sense path in the SAM if replacing the module. [Elektroda, sk700, post #16770519]

What proportion of cases show module fault versus bulb/wiring?

In this thread, at least one case confirmed the lamp and wiring worked on external 12 V, pointing to the SAM output stage. Two distinct codes were logged. Treat the SAM as suspect after basic lamp and wiring tests. [Elektroda, wacek, post #16770458]

Why does the cluster show a yellow bulb warning after a while?

The SAM supervises circuits and flags a bulb‑out or implausible state on the dash. One owner saw the yellow lamp symbol despite manual lamp operation. That supports a monitored output not meeting expected current or state. [Elektroda, pawko122, post #17452431]

What unanswered question from the thread can we resolve? Can the SAM be replaced with matching numbers only?

You can install a same‑number SAM to test, but for a proper fix you should code it to the vehicle’s equipment. Coding aligns supervised outputs and avoids persistent warnings. [Elektroda, sk700, post #16770923]
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