Year: 2026

A practical engineering reference for a rare cluster variant

Overview

UPDATE: Later the official schematic was found

This article documents the electrical pinout and internal behavior of a rare Volkswagen Mk1 Rabbit instrument cluster for which official documentation is difficult to obtain.

The cluster uses a dual-row 18-pin connector (9+9 layout), with numbering defined from the rear side.

The main PCB is flexible (and very old) and now most of them are in very bad condition.

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Connector Layout

Rear view numbering: 
1  ...  9
18 ... 10

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Pinout Description

Upper Row (Pins 1–9)

Pin	Function	Notes
1	Not connected	Electrically linked to Pin 2 (likely missing resistor path)
2	Not connected	Possibly part of unused circuit
3	Constant +12V	Supplies clock
4	Fuel level sensor	Standard resistive sender 30 – 300 Ohms (around that) – high/low.
5	Tachometer input (KL1)	High probability
6	Illumination (KL58)	Dashboard lighting
7	Ground (GND)	Common reference
8	Not present	No pin
9	Turn signal indicator	Blinkers

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Lower Row (Pins 10–18)

Pin	Function	Notes
18	Temperature sensor	Low resistance triggers warning lamp. As usual, around 1k on amb. temperature and around 40-50 Ohms while fully heated.
17	Glow plug lamp (diesel)	Active low
16	Oil pressure lamp	Active low
15	PCB trace only	Routed on board, no external function
14	Seatbelt warning lamp	Active low
13	+12V supply (likely ignition)	Feeds multiple resistive paths
12	Brake warning lamp	Active low
11	Battery/alternator lamp	Active low, used for excitation
10	High beam (KL56)	+12V → lamp → ground

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Internal Design Characteristics

Analog Measurement System

All primary gauges (fuel, temperature) are based on:

• Bimetallic thermal elements
• Heating via controlled current
• Mechanical deflection proportional to temperature

This design is consistent with early Volkswagen clusters (Mk1, Mk2).

Stabilized Supply

• Gauge elements are powered from a regulated ~10V supply
• Ensures stable readings independent of battery voltage fluctuations

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Indicator Logic

• Most warning lamps operate on active-low signals
  → The cluster expects a ground signal to illuminate
• Exceptions:
  • High beam (Pin 18) uses positive drive
  • Illumination (Pin 6) tied to vehicle lighting circuit

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Notable Electrical Observations

• No diode present in series with the alternator lamp (Pin 17)
  → Important for proper excitation circuit behavior
• No digital electronics present (except clock but clock does not work on my unit)
  • No signal conditioning ICs
  • Tachometer input likely handled via discrete analog circuitry, but our cluster is without tacho.
• Minimal signal processing
  → Direct wiring + passive components dominate design

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Engineering Notes

• The cluster is fully analog, making it:
  • Easy to interface with custom hardware (e.g., microcontrollers)
  • Predictable in behavior
  • Robust but less precise than modern systems
• When interfacing:
  • Respect active-low logic for most indicators
  • Provide stable voltage for gauge emulation
  • Use appropriate signal shaping for tachometer input

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Conclusion

This instrument cluster represents a classic analog automotive design, with simple yet effective circuitry. Despite the lack of official documentation, the pinout and behavior can be reliably characterized, enabling restoration, testing, or integration into custom automotive or embedded projects.

There is a lot of unclear information about Golf/Jetta 2 pinouts so we decided to publish the information for these old cars here free of charge and so everyone can use it in projects and in repairs.

Golf 2(Jetta 2) had two generation of cars, the first was CE1 and had two sockets in the car – black and white, and the second one, CE2 – white or black single two-row 28-pin(14+14) socket with 2.54 spacing.

CE1

Below is a pinout of CE1 version of wiring with two versions of the naming.

Plugs are assembled from two parts but it’s not easy to notice it.

The plugs part number:

White:

AMP 926505+927294

Black:

AMP 926505+927293

The plugs are slightly different in their appearance.

Important – the crimped pin part number:

000979115E

It is almost impossible to buy it separately and uncrimped, unfortunately.

White connector

Pin	Assignment
1 (O7)	Blinker output, tied to ground for the indicator lamp.
2 (A7)	Frei — not connected.
3 (O6)	Terminal 58, positive supply for the panel backlight.
4 (A6)	Resistive coolant temperature sensor input. (1K-100 Ohm)
5 (O5)	Resistive fuel level sensor input. (30-220 Ohm)
6 (A5)	Ground return “For MFA”
7 (O4)	Additional ground return.
8 (A4)	Terminal 1 engine-speed signal (coil, distributor, or other waveform up to 12 V with possible 300 V spikes).
9 (O3)	MFA mode line used to change MFA functions. (Active: connect to Car Mass/ GND)
10 (A3)	UNR permanent positive supply (unused on Replica Gen One , main supply on Replica Next).
11 (B2)	MFA temperature “+” lead for the ambient sensor
12 (A2)	MFA oil temperature sensor lead
13 (O1)	KL 56a high-beam indicator input (+12 V active).
14 (A1)	Not connected

Black connector

Pin	Assignment
1 (O7)	Terminal 15 switched +12 V from the ignition switch.
2–4 (C7, O6, C6)	Not connected.
5 (O5)	Handbrake indicator input (Active: connect to Car Mass/ GND)
6 (C5)	KL 61 generator warning lamp drive with 120 Ω excitation resistor. (Lamp active: connect to Car Mass/ GND)
7 (O4)	Oil pressure switch, 0.3 bar. (Active “failure”: connect to Car Mass/ GND)
8 (C4)	Oil pressure switch, 1.8 bar. (Active “OK”: connect to Car Mass/ GND – after 3000 RPM)
9 (O3)	Not used.
10 (C3)	Glow-plug indicator input (+12 V active, diesel only). (Active: connect to Car Mass/ GND)
11(O2)	Hall sensor input for optional speed sensors. (10V pulse output)
12 (C2)	MFA block selection line. (Active: connect to Car Mass/ GND)
13 (O1)	MFA reset line. (Active: connect to Car Mass/ GND)
14(C1)	Free

CE2

Reference: Internal tests and checks And (many thanks):

https://www.a2resource.com/electrical/CE2cluster.html

Example connector was provided in one of the clusters, which was sourced from a car junkyard. Connector(car side) part number: 191 972 530B Additional label: “W. Germany. 6HW 16 331”

28 pin is organised by 2 rows by 14 pins. Pitch: 2.54 mm. Distance between rows: 2.54*2 mm

Cluster Pin	Function	Color (A2)
01	Outside Air Temperature Sensor Ground	Blue/White
02	Coolant Level Low (1990+ only)	Violet (1989) or Red/White
03	Ground	Brown
04	MFA Switch- Reset	Gray
05	MFA Switch Ground, Ground for Sensors	Brown/White
06	MFA Switch- Function	Green/White
07	Speed Sensor Output	Violet
08	High Oil Pressure Signal	Yellow
09	Low Oil pressure Signal	Red/White
10	Tachometer	Green
11	MFA/Clock Constant Power	Red
12	Dash Lights	Gray
13	Start/Run Power, Fuse 16	Black
15	MFA Switch- Mode	Black
16	Battery Light	Blue
17	Engine Oil Temperature	Black/White
19	Outside Air Temperature Sensor	Violet
20	Glow Plug Indicator	Green/White
21	Fuel Level	Blue
23	Coolant Temperature Sensor	Yellow/Red
24	Turn Signal Light	Green
25	High Beam Indicator Light	Blue/White