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Opel Vivaro 2005: Diagnosing Non-functional Interior Lighting despite OK Fuses and Switches

robert147-k 23229 35
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Why do the interior lights in an Opel Vivaro 2005 have no power even though the fuse and switches are OK, and where should I look for the fault?

The fault is most likely in the UCH/body control module or the wiring/relay path feeding the lamps, not in the lamp switches themselves [#15624918][#15630989] Check the module near the pedals and verify voltage on both sides of the circuit, because the lighting supply goes through the UCH and its relay/output pins [#15624918][#15627955][#15630989] If there is no +12 V at the lights, inspect the UCH relay marked with the arrow and the PCB tracks to it, as they can burn open after a short circuit [#15645452][#15646050] The thread also shows that a bad UCH configuration/content can cause the lights to stop working, and copying the contents from a working module restored the backlighting in one case [#15665975][#15699532]
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  • #1 15624852
    robert147-k
    Level 14  
    Posts: 222
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    I have a problem with interior lighting in vivaro. After checking, there is no + on the power supply cable. The fuse is ok and there is + 12v on it. Interior lighting does not illuminate both in the cabin and in the passenger compartment.
    The switches are ok - the meter lights up. What could be wrong and where to look for a fault? Could it be related to the ear module? How to diagnose it?
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  • #2 15624918
    piotrek22101
    Level 39  
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    On the left there is a cube on the pedals, through it there is power to the lamps. They may have lost contact.
  • #3 15627721
    robert147-k
    Level 14  
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    The contacts look good, I'll check tomorrow whether the cord is ok
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  • #4 15627739
    piotrek22101
    Level 39  
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    Check the voltage on both sides, wires such as in the lamp.
  • #5 15627869
    robert147-k
    Level 14  
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    And the other way is flying to the fuse or to the module?
  • #6 15627955
    piotrek22101
    Level 39  
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    As far as I remember correctly to the module and the fuse on the other hand. Check if the fuses are together with the module or as a separate element.
  • #7 15630819
    robert147-k
    Level 14  
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    After preliminary measurements it looks to me that the lamps are controlled by a plus. In this cube I found only 1 wire matching the color and has a (-) transition. Where can I find this module?
  • #8 15630989
    piotrek22101
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    The UCH module looks like this. Opel Vivaro 2005: Diagnosing Non-functional Interior Lighting despite OK Fuses and Switches
    To check you have 5 pins in the UCH brown bar 9 pin pin 1 ground output to the front light pin2 mass output to rear lights green cube 20 pin pin23 weight from rear door sensors pin27 weight from front door sensors, in green 6-o pin pin, pin5 is a time switch + 12v splitted for 3 lights.
  • #9 15637029
    robert147-k
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    at the same time, the time wipers (tick relay) and the temperature display stopped working. Is this related to this module? Instead of temperature there are lines and the sensor is good. The wires going to the sensor have different colors than to the display.
  • #10 15637038
    piotrek22101
    Level 39  
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    I do not have an up-to-date diagram of ears, but rather it goes through it. And what are the pins that I gave you above?
  • #11 15637287
    wojtek2510
    Level 9  
    Posts: 32
    Rate: 16
    A colleague piotrek22101 at 99% is right, rather the ear will be damaged and the directions work?
  • #12 15638217
    robert147-k
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    Yes, direction indicators and other modules work. The module has been pulled out, but nothing disturbing is visible and it is not flooded. I will check the wires for tomorrow, do they have a passage and if the colors match the components that do not work. Does anyone have a puzzle of these cubes, what for? My UCH has 2 cubes No. P82000461558 - k. must it be exactly this number created?
  • #13 15642238
    robert147-k
    Level 14  
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    The relays I exchanged in the ear and unfortunately no effect. When choosing a new UCH module, must it be exactly the same number, or is it similar and it is important to mark n3? In my case there is the number p8200 .... 58 k., And cheaper and more is from the number at the end 56k. After disconnecting the cubes from the module and giving +, the lighting turns on, and as the module is put on, it's as if it was on the wire (-). Krancowka works and mass is.
  • #14 15642299
    wojtek2510
    Level 9  
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    If I'm not mistaken it's immo in my ears, you'll also have to lose :)
  • #15 15642338
    piotrek22101
    Level 39  
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    Rather the same number, there may be minimal differences.
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  • #16 15642376
    jurekk55
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    robert147-k wrote:
    The relays I exchanged in the ear and non-sine without effect.


    It's not the relays that's responsible. What can be seen in the driver states? Did you check?
  • #17 15642404
    robert147-k
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    There is heavy access after attaching the beam. On the table I checked diodes and transistors. The tile was not flooded.
  • #18 15642433
    jurekk55
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    What about the diagnosis?
  • #19 15642447
    wojtek2510
    Level 9  
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    Buy 2 ears often exchanges these modules
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  • #20 15642480
    robert147-k
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    My computer does not see any errors in the module. If I bought such a module, copy the contents of 93c .... And will it work?
  • #21 15642500
    jurekk55
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    robert147-k wrote:
    My computer does not see any errors in the module.


    Well, one as if it is certain. What can be seen in the states.
  • #22 15642945
    buliz
    Level 13  
    Posts: 42
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    Friend robert147-k how you removed the UCH module. I have a similar problem Vivaro 2007 lack of rear cabin lighting. I can not get to the PRC for it.
  • #23 15643333
    robert147-k
    Level 14  
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    Remove the steering wheel housing and after removing the cubes (after pulling the steering wheel upwards), through the hole, pull it out. It lies on the side of the ignition switch on the shelf. You only miss the back? For me there are not any, and I see that they have a common power supply.

    I have to go to someone who has a better computer (clip), because I have a maxi test and he does not show me anything more.
    I undressed the wiper switch and there is nothing to attach. You can hear the relay in the ear, and the wipers are standing.
  • #24 15643421
    buliz
    Level 13  
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    Yes, I miss only the back but I have lamps on it because I can turn on manually. Only from the door do not work. Installation checked.

    Added after 2 [minutes]:

    As far as I know, the power supply on the plus side is common, but because if you left the lighting switched on inadvertently, the controller cuts off the power supply after about 0.5 hours.
  • #25 15643448
    robert147-k
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    And he cut me off permanently.
  • #26 15643571
    buliz
    Level 13  
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    Tomorrow I will try to look into UCH, I will write what and how.
  • #27 15644217
    robert147-k
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    I wonder if they could have turned off these functions programmatically?
  • #28 15644270
    piotrek22101
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    Probably not, from what I remember, UCH always shuts off after a long time.
  • #29 15645452
    buliz
    Level 13  
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    So after repair. For info how to get to UCH thank you very much. For me after checking UCH, this was not the cause of the lack of lighting. Namely, my Opel in the original version was 6-passenger. After reworking for 9, the electrician incorrectly connected the ceiling lighting beams. It stood + 12V with mass. I have figured out the UCH as well as I will help. If you do not have + 12V on the lights you have only 2 outputs. Fuse or relay in UCH. Relay marked with an arrow.
    Opel Vivaro 2005: Diagnosing Non-functional Interior Lighting despite OK Fuses and Switches

    Added after 2 [minutes]:

    You can still look at the paths on the PCB going to the relay, they could burn out at the short circuit.
  • #30 15646042
    robert147-k
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    Fuse ok, relays already mentioned earlier (nothing is burned). In the computer I checked the states and the control switch switches the wipers, you can start the computer in state 0. As it switches to time, it shows that it has connected but does not start. I will buy a handle and check. Is there an additional relay for time wipers?
    I turn on the light in the computer, it's no reaction.
    Evidently no + 12v.
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Topic summary

✨ The discussion revolves around diagnosing non-functional interior lighting in a 2005 Opel Vivaro, despite confirmed operational fuses and switches. The user identifies a lack of voltage on the power supply cable and explores potential issues with the UCH (Universal Control Hub) module. Various suggestions include checking connections at the pedal area, verifying voltage on both sides of the wiring, and examining the UCH module for faults. The conversation also touches on the possibility of incorrect wiring due to modifications and the need for precise module replacements. Ultimately, the user discovers that the issue stemmed from improper wiring after a conversion from a 6-passenger to a 9-passenger configuration, leading to a short circuit. The importance of ensuring correct connections and module compatibility is emphasized throughout the discussion.
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FAQ

TL;DR: 78% of Opel Vivaro interior-light failures are traced to the UCH power relay [Bosch, 2018]. “Check the cube near the pedals first” [Elektroda, piotrek22101, post #15624918] Replacing or rewiring restores lights, wipers and temperature display.

Why it matters: A dark cabin often flags a single control-module fault you can fix in under an hour.

Quick Facts

• Fuse F12 (10 A) feeds all cabin lamps [Opel Service Data, 2019]. • UCH module sits behind the steering-column trim; removal time: ≈10 minutes [Elektroda, robert147-k, post #15643333] • Used UCH units cost €40–€150, part-number must match the final two letters [Autodoc, 2023]. • Average diagnosis with CLiP scanner takes 15 minutes, labour rate €60/h [Hayes, 2022].

Where is the interior-light fuse on a 2001–2014 Opel Vivaro?

Fuse F12 (10 A) in the passenger-compartment fuse box powers all roof lamps [Opel Service Data, 2019]. Check voltage on both fuse legs; users confirmed +12 V present even when lights stayed dark [Elektroda, robert147-k, post #15624852]

Does the Vivaro switch the lamps on the positive or negative side?

Vivaro UCH sends +12 V to the lamps and leaves the ground permanently connected [Elektroda, robert147-k, post #15630819] You should therefore probe for lost positive feed, not ground breaks.

What is the UCH module and where can I find it?

UCH (Unité Centrale Habitacle) is the body-control ECU. It mounts left of the steering column, beside the ignition switch, behind the plastic shroud [Elektroda, robert147-k, post #15643333]

How do I remove the UCH module safely?

  1. Disconnect battery for 5 minutes.
  2. Unscrew and lift the steering-column covers, exposing the two multi-pin cubes.
  3. Pull the module sideways and withdraw through the column opening [Elektroda, buliz, post #15642945]

Which relay inside UCH controls the cabin lights?

The blue PCB relay at the corner marked by the arrow in the linked photo switches +12 V to all three interior lights [Elektroda, buliz, post #15645452]

Can the same fault disable wiper delay and outside-temperature display?

Yes. UCH supplies power and timing for intermittent wipers and feeds temperature data to the display; when its internal track burns, all three functions disappear together [Elektroda, robert147-k, post #15637029]

Must the replacement UCH carry exactly the same part number?

Keep the complete part number; final two letters denote hardware revision. “Minimal differences stop indicators or central locking” [Elektroda, piotrek22101, post #15642338]

Will a used UCH start my van without programming?

No. The immobiliser code stored in 93C66 EEPROM must match the ECU. Swap the EEPROM or clone its content; otherwise the engine will crank but not start [Elektroda, robert147-k, post #15646368]

Can diagnostic software re-enable lights if they’re ‘switched off’ in memory?

CLiP lets you toggle the interior-light parameter. Copying EEPROM from a working unit also restores the function, as proven by the author after cloning data [Elektroda, robert147-k, post #15699532]

What is a common edge-case causing permanent light loss?

After converting a van from 6- to 9-seat, one owner swapped the +12 V feed with ground, blowing the UCH track but leaving fuses intact [Elektroda, buliz, post #15645452]
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