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Locating Comfort Module in Golf IV Estate: A Detailed Query on Golf Electronics

MrBartolinio1 15792 14
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  • #1 17288897
    MrBartolinio1
    Level 8  
    Posts: 7
    Rate: 4
    Hello, I have a problem with golf electronics and I need to find a comfort module. In Passat it is supposedly somewhere in my legs, but in Golf none of my friends can tell me. I would ask for a hint.
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    #2 17288921
    Adam1234
    Level 12  
    Posts: 129
    Help: 6
    Rate: 13
    Welcome to the steering wheel is probably located.
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    #3 17289032
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    What are your problems with electronics?
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    #4 17290751
    ziomek-33
    Level 14  
    Posts: 154
    Help: 7
    Rate: 47
    You'll have him under the wheel
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  • #5 17291307
    MrBartolinio1
    Level 8  
    Posts: 7
    Rate: 4
    Thanks gentlemen! I have already covered the subject. I did not have a fan of air, it turned out that the previous owner converted the beam and there was no electricity on the plug. I managed to get it and work, but I have a different problem. Due to the fact that this guy przekombinował disappeared me backlight clocks, radios, etc. please tell me, if you know what colors of cables are responsible for this highlight and where does the power come from and where it should go
  • #6 17291364
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    Check if you have power on the brightness control panel backlight
  • #7 17292745
    MrBartolinio1
    Level 8  
    Posts: 7
    Rate: 4
    I have power on a gray cable. I understand that the gray-blue cable is (-)? I measured this with a multimeter and wonders why there is a minus on this cable, since it is in the blue plug on the clocks and is responsible for highlighting (from what the diagrams say). Someone was working with electronics in this car, but until now everything was playing ... I do not know what it was. As bridged on the potentiometer gray with gray-blue there is no effect: /
  • #8 17292800
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    1. check fuse No. 3
    2. check if the voltage appears on the fuse after switching on the lights (+ the ignition switch)
    3. Check the fuse 20
    Let me know what you agreed
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  • #9 17292888
    MrBartolinio1
    Level 8  
    Posts: 7
    Rate: 4
    The fuse number 3 is good, after switching on the lights and the ignition is 12.01 on the multimeter. The number 20 is also good, but I have 11.62 on it after switching on the lights and ignition
  • #10 17292966
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    You can replace the light switch on the test?
  • #11 17293006
    MrBartolinio1
    Level 8  
    Posts: 7
    Rate: 4
    He's got me comfortable with Seat Exeo (Audi A4 - the same plug, the lights also turned on as the original one). On the gray-blue cable there is still no electricity, and in the Seating 12.00.

    I was thinking about chirping directly in front of the board from the purple cable on the switch. Along the way I would do some fuse and if I do not have a way out, I will probably do it. What do you think?
  • #12 17293735
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    Check if you have +12 on the pins described as lighting indicators
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  • #13 17294391
    MrBartolinio1
    Level 8  
    Posts: 7
    Rate: 4
    On 58 I have +12, on 31 (brown - looks like mass) and on 58d I have nothing
  • #14 17294611
    psilos1
    Level 32  
    Posts: 1822
    Help: 203
    Rate: 873
    Check if our backlit license plate is turned on after turning on the lights ...
  • #15 17294661
    MrBartolinio1
    Level 8  
    Posts: 7
    Rate: 4
    I have. The left bulb is on, the right one is probably burnt
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Topic summary

✨ The discussion revolves around locating the comfort module in a Golf IV Estate and troubleshooting related electronic issues. The user initially seeks guidance on the comfort module's location, with suggestions pointing to its placement under the steering wheel. After resolving a fan issue caused by a previous owner's modifications, the user encounters problems with the backlight for the clocks and radio. Various responses provide troubleshooting steps, including checking fuses, verifying power on specific cables, and testing the light switch. The user measures voltages on different cables and discusses potential solutions, including direct wiring to the switch. The conversation highlights the complexity of automotive electronics and the importance of proper wiring and connections.
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FAQ

TL;DR: Golf IV Estate dash‑lighting and comfort‑module guide. 11.62 V measured at fuse 20; "fuse number 3 is good." Use fuse and dimmer‑pin checks to restore backlight quickly. [Elektroda, MrBartolinio1, post #17292888]

Why it matters: This FAQ helps Golf IV Estate owners quickly find the comfort module and fix dead instrument backlighting without guesswork.

Quick Facts

Where is the comfort module in a Golf IV Estate?

It sits under the steering wheel area, behind the lower dash trim. Remove the under‑wheel panel to access connectors and the module. An owner described it succinctly: "You'll have him under the wheel." Use trim tools and disconnect the battery before unplugging. [Elektroda, ziomek-33, post #17290751]

Which fuses should I check for dead dash illumination?

Check Fuse 3 and Fuse 20 first. Verify that voltage appears on the fuse with the lights turned on and the ignition active. As one expert put it, "Check fuse No. 3." Confirm both continuity and live voltage under load, not just visual condition. [Elektroda, psilos1, post #17292800]

What do terminals 58, 31, and 58d stand for on the lighting circuit?

Terminal 58 is the +12 V lighting feed when lights are on. Terminal 31 is ground. Terminal 58d is the dimmer output that feeds the cluster and other illumination. In the referenced case, 58 had +12 V, 31 was ground, and 58d showed no output. [Elektroda, MrBartolinio1, post #17294391]

How do I test the dimmer output (58d) with a multimeter?

Turn on the parking or headlamps. Back‑probe terminal 58 for +12 V and terminal 58d while rotating the dimmer. You should see voltage change on 58d if the dimmer works. If 58 is live but 58d stays at 0 V, trace wiring or the dimmer. [Elektroda, psilos1, post #17293735]

My license‑plate light works, but the dash backlight doesn’t. What does that mean?

It suggests the light switch’s general feed is present. The fault likely lies in the dimmer output path (58d), the cluster feed, or related wiring. Use the plate‑light as a quick confirmation, then measure at 58 and 58d to narrow the fault. [Elektroda, psilos1, post #17294611]

I see 12.01 V on Fuse 3 and 11.62 V on Fuse 20. What next?

Those readings show power reaches the panel, with a 0.39 V difference noted. Proceed to the dimmer: verify 58 is +12 V and check 58d for output while turning the wheel control. If 58d is dead, focus on the dimmer or its wiring. [Elektroda, MrBartolinio1, post #17292888]

Will replacing the headlight switch fix no‑backlight issues?

Not always. In testing with a Seat Exeo/Audi A4 switch, the lights worked, yet the gray‑blue dimmer output still had 0 V in the Golf. That points to wiring or downstream issues rather than the switch. A known‑good switch is still a useful test. [Elektroda, MrBartolinio1, post #17293006]

What do the gray and gray‑blue wires do on the dimmer/cluster plug?

In the reported case, the gray wire had power. The gray‑blue wire measured negative potential, and bridging gray to gray‑blue at the potentiometer made no difference. That behavior indicates a break or miswire in the dimmer output path. [Elektroda, MrBartolinio1, post #17292745]

How can I quickly diagnose no cluster backlight?

Follow this three‑step sequence:
  1. Check Fuse 3 for continuity.
  2. With lights and ignition on, confirm voltage appears on the fuse.
  3. Check Fuse 20 similarly and note readings under load. This isolates supply issues fast before deeper tracing. [Elektroda, psilos1, post #17292800]

Is it safe to bridge 12 V from the switch to the cluster to restore lighting?

Use a fused jumper only for brief testing, not as a permanent fix. One owner proposed a fused feed from the switch to the cluster when 58d was dead. Restore the original 58/58d path after identifying the break or failed dimmer. [Elektroda, MrBartolinio1, post #17293006]

My Golf’s wiring was modified by a previous owner. Where should I start?

Start at the light switch and dimmer. Verify power at the plug and trace the illumination feed toward the cluster. The owner reported missing feeds after a harness conversion, which removed backlighting. Recreate the correct paths before adding new wires. [Elektroda, MrBartolinio1, post #17291307]

Could the comfort module be causing the cluster backlight failure?

Focus first on the lighting circuit: Fuse 3, Fuse 20, terminal 58, and 58d from the dimmer. These are the primary backlight paths flagged in the thread. Check the comfort module only after these pass tests. [Elektroda, psilos1, post #17292800]

How do I confirm the cluster illumination feed at the connector?

Back‑probe the cluster’s blue plug at the terminal for lighting feed. Expect +12 V on 58 with lights on. Then check 58d while adjusting the dimmer. A dead 58d with live 58 indicates a dimmer or wiring fault. [Elektroda, MrBartolinio1, post #17294391]

Plate light works on one side only—can the dash still be dark?

Yes. One report showed a lit left plate bulb, a likely burnt right bulb, and still no dash backlight. That combination points to an issue specific to the dimmer output or cluster feed, not the main lighting feed. [Elektroda, MrBartolinio1, post #17294661]
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