Pinout of the Škoda Octavia Tour comfort unit: analysis of diagrams, errors and nuances

Comfort block in Škoda Octavia Tour - This is the central unit responsible for controlling lighting, power windows, central locking and other “comfort” functions. Without this module working correctly, even basic operations - from opening doors to adjusting mirrors - can become a problem. However, information about its pinout is often scattered: in the manufacturer’s manuals the data is presented fragmentarily, and on forums there are contradictory diagrams.

This article brings together verified data on the pinout of comfort blocks for generations A5 (1Z3, 2004–2013), A7 (5E, 2013–2020) and restyled versions (FL). We will analyze not only the purpose of each contact, but also typical errors when connecting, methods for diagnosing faults, as well as nuances that even experienced automotive electrical systems are silent about. If you are planning repairs, tuning, or just want to understand why the interior lighting is not working, here you will find the answers.

What comfort units were installed on the Octavia Tour

On different generations Octavia Tour comfort blocks from VW Group with different articles and pinouts. Main options:

• 🔧 1K0 937 049 (A/B/C) — basic version for Octavia A5 (until 2009). Features a lack of support CAN-LIN for some functions.
• 🔧 1K0 937 049 D — modification with extended logic for machines with climate control and xenon headlights.
• 🔧 5E0 937 049 - block for Octavia A7 (2013–2020), compatible with MQB-platform. It has a different connector and data exchange protocol.
• 🔧 5E0 937 049 C — version for restyled models (FL), with support keyless entry (Keyless).

Important: blocks from Octavia A5 and A7 not interchangeable no modifications! Even externally similar modules (for example, 1K0 937 049 B and 5E0 937 049 A) have different firmware and connector pinouts. Before purchasing a replacement, check not only the article number, but also software version (you can find it out through a diagnostic scanner).

On forums there is often advice to “take a disassembled unit and reflash it.” This is dangerous: if the firmware version does not match immobilizer or CAN bus car, you risk getting errors like U1113 (no connection with the comfort unit) or even blocking the engine from starting.

Pinout of comfort block Octavia A5 (1Z3, 2004–2013)

Comfort block in Octavia A5 Tour has two main connectors: T32a (32-pin, black) and T32b (32-pin, gray). Below is the pinout for the most common version 1K0 937 049 C:

Contact	Wire color	Purpose	Notes
T32a/1	Red/black	Power supply +12V (KL.30)	Constant battery power
T32a/2	Brown	Ground (GND)	Total weight for block
T32a/10	Green/black	CAN-High	High speed (500 kbps)
T32a/11	Yellow/black	CAN-Low	Low speed (100 kbps)
T32b/25	Purple/black	LIN bus (doors)	Door controller management

Pinout features Octavia A5:

• 🔌 Contacts T32a/16 and T32a/17 responsible for management interior lighting. If the lamps do not work, check the integrity of the wires and the presence of + 12V on these contacts.
• 🔌 T32b/5 and T32b/6 - signals from rain sensor (if installed). If the wire is broken, an error may appear B1168.
• 🔌 T32b/20 - management heated mirrors. Often oxidizes due to moisture.

Critical Feature: In Comfort Blocks Octavia A5 before 2008 release contact T32a/24 (blue/green wire) is responsible for the signal from immobilizer. If it is damaged, the car may not start, and the diagnostics will show an error. U1113 or P1610.

Pinout of comfort block Octavia A7 (5E, 2013–2020) and FL

B Octavia A7 Tour comfort block (5E0 937 049) has a different architecture: instead of two 32-pin connectors, one is used here 54-pin connector (T54c). Main changes:

• 🔄 Go to CAN-FD (higher data transfer speed).
• 🔄 Integration with the system Keyless (if installed).
• 🔄 Separate lines for control LED lighting salon

Key contacts for diagnostics:

Contact	Wire color	Purpose	Typical faults
T54c/1	Red	Power supply +12V (KL.30)	Fuse blown S5 (20A)
T54c/16	Green/yellow	CAN-High (comfort)	Open or short circuit to ground
T54c/30	Orange/black	Glove box light control	Oxidation of contacts due to moisture
T54c/45	Blue/green	Signal from trunk button	False alarms due to wire damage

B Octavia A7 FL (facelift) added contacts for control contactless trunk opening (T54c/50 - foot sensor) and ambient lighting (T54c/52). If these functions do not work, check:

1. Availability of food T54c/1 and T54c/2 (mass).
2. The integrity of the wires from the motion sensor under the bumper.
3. Menu settings MMI → Vehicle settings → Comfort.

What happens if you confuse CAN-High and CAN-Low?

If the CAN buses are connected incorrectly, the comfort unit will go into emergency mode and errors will appear in the system U1121 (no connection with CAN) and U1113. In some cases, this can lead to the immobilizer being blocked. To restore, you will need to reset adaptations via VCDS or similar scanner.

Typical mistakes when working with a comfort unit

Even experienced automotive electrical systems make mistakes when diagnosing or replacing a comfort unit. Here are the most common:

⚠️ Attention: Never connect the comfort unit from Octavia A7 to A5 without CAN bus adapter! Differences in communication protocols can lead to failure immobilizer or engine control unit.

• ⚡ Ignoring adaptation after replacement. A new comfort unit requires "learning" via a diagnostic scanner (e.g. VCDS or ODIS). Without this, the power windows, central locking and lighting will not work.
• ⚡ Checking only power, without mass. Contact T32a/2 (or T54c/2 for A7) must have reliable grounding. Bad ground leads to floating errors like B1140 (control circuit malfunction).
• ⚡ Replacing the unit without checking the fuses. B Octavia A5 fuses are responsible for the comfort unit S30 (10A) and S5 (20A). B A7 — S5 (20A) and S31 (15A).

Another common problem is false alarms. If the comfort unit begins to “see” an open door or trunk when they are closed, check:

• 🔍 Condition door limit switches (often oxidize or break).
• 🔍 Integrity of wires from the limit switches to the comfort block (especially in the corrugation of the threshold).
• 🔍 Sensor sensitivity settings in Adaptations → Comfort block → Limit switches (via diagnostic scanner).

Check fuses S5, S30, S31|

Measure the voltage at the power contacts (should be 12V)|

Ring the ground on the body|

Download error log via diagnostic scanner|

Check the integrity of the CAN buses (the resistance between CAN-H and CAN-L should be 60 Ohms)

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How to diagnose a comfort unit without a scanner

Not everyone has access to VCDS or OBDeleven, but basic diagnostics can be done using a multimeter and a probe lamp. Algorithm of actions:

1. Power check:
   • Connect red dipstick multimeter to T32a/1 (A5) or T54c/1 (A7).
   • Black dipstick - to ground (for example, a block mounting bolt).
   • The voltage should be 11.8–12.6V with the ignition off.
2. Checking CAN buses:
   • Measure the resistance between CAN-High and CAN-Low (contacts T32a/10 and T32a/11 for A5).
   • Norm: 58–62 Ohm. If the resistance tends to 0 or infinity, there is a break or short circuit.
3. Control check:
   • Connect the probe lamp to T32b/16 (interior lighting control) and turn on the ignition.
   • When the door is opened, the lamp should light up. If not, the problem is in the block or wiring.

If the comfort unit shows no signs of life at all (window lifters do not work, there is no response to the central locking buttons), try resetting its settings:

1. Disable negative battery terminal for 10 minutes.
2. Reconnect and turn on the ignition (without starting the engine).
3. Press and hold the button central lock on the driver's door in the "closed" position for 10 seconds.

Attention: this method only works for blocks Octavia A5! B A7 Resetting the settings is only possible through a diagnostic scanner.

Frequent malfunctions and ways to solve them

Most problems with the comfort unit in Octavia Tour have typical "symptoms". Let's look at the most common ones:

Symptom	Possible reason	Solution
Power windows don't work	No power to T32b/12 or the fuse is faulty S30	Check the fuse and the integrity of the wire from the comfort unit to the driver button
Spontaneous opening/closing of doors	Short circuit in the limit switch wires or unit malfunction	Ring the wires from the doors to the block, replace the block if necessary
Interior lighting does not work	Oxidation of contacts T32a/16 or the lamp is burnt out	Clean the contacts, check the lamp and fuse S5
Error U1113 (no connection with comfort block)	CAN bus break or unit malfunction	Check the resistance of the CAN buses, replace the unit if necessary

The problem with false alarms. If the comfort unit “thinks” that the door is open, although it is closed:

1. Check door switches (the plastic rod often breaks).
2. Clean the contacts of the limit switches from oxidation.
3. If the problem remains, replace the limit switch (part number: 1K0 959 701 for A5, 5E0 959 701 for A7).

B Octavia A7 the system can become an additional headache Keyless. If the car does not respond to the key or opens the doors spontaneously:

• 🔑 Check the voltage on the system antennas (T54c/48 and T54c/49).
• 🔑 Update the firmware of the comfort unit (required ODIS or VCDS with a license).
• 🔑 Replace the battery in the key (even if the indicator does not show discharge).

Modifications and tuning of the comfort unit

Comfort block in Octavia Tour can be upgraded to add new features. Popular improvements:

• 🔧 Activating the "Comfort Opening/Closing" function (automatic opening/closing of windows and sunroof when holding down the key button). Requires unit firmware via VCDS.
• 🔧 Connecting ambient lighting. B Octavia A7 FL there is already a contact for this T54c/52, in A5 you will have to run separate wires.
• 🔧 Installation of contactless trunk opening. The wiring and firmware of the unit will need to be modified (if the function is not supported out of the box).
• 🔧 Replacing incandescent lamps with LED. It is important to select LEDs with the correct resistance, otherwise the comfort unit will generate an error B1140.

To activate hidden functions via VCDS:

1. Connect the scanner and select the module 46 – Comfort System.
2. Go to Adaptation → Channel 60 (for Comfort Opening).
3. Set value 1 (enabled) and save.

Attention: Not all functions can be activated on earlier versions of comfort units. For example, in Octavia A5 before 2008 there is no hardware support Comfort Opening, and trying to flash it will lead to errors.

How to bypass error B1140 when installing LED lamps?

In the comfort block Octavia A5/A7 There is current monitoring of lamp health. To avoid errors, connect a resistor with a resistance parallel to the LED lamp 470 Ohm (power 0.5 W). This simulates the load of a standard incandescent lamp.

FAQ: Frequently asked questions about the Škoda Octavia Tour comfort unit

Is it possible to replace the comfort unit from an Octavia A5 with an A7?

No, the units are incompatible due to different connectors and CAN bus protocols. B Octavia A7 used CAN-FD, and in A5 - classic CAN 2.0. In addition, the comfort block A7 integrated with the system Keyless, which is not in A5.

Why do the power windows not work after replacing the comfort unit?

Most likely not completed adaptation new block. Connect the diagnostic scanner (VCDS, OBDeleven) and follow the "Basic Settings" procedure in the module 46 – Comfort System. Also check the fuse S30 (10A).

How to reset error U1113 (no communication with comfort unit)?

Error U1113 indicates problems with the CAN bus. Check:

1. Resistance between CAN-High and CAN-Low (should be 60 ohms).
2. Integrity of wires from the comfort unit to head unit (usually the break occurs in the corrugation under the brake pedal).
3. Contact voltage CAN-H (2.5V) and CAN-L (2.5V) relative to mass.

If the wires are intact, but the error remains, the comfort unit itself is faulty.

Where is the comfort unit located in the Octavia Tour?

B Octavia A5 Tour the comfort block is located under the dashboard on the driver's side, next to the heater control unit. B Octavia A7 Tour he is located behind the glove compartment, under the casing. To gain access you will need to remove the plastic cover.

Is it possible to repair the comfort unit or just replace it?

In most cases the comfort block not repairable, since it is a microprocessor device with sealed components. However, sometimes it helps:

• Resoldering capacitors (if swollen).
• Cleaning oxidized connector contacts.
• Replacing the blown fuse inside the unit (if there is one).

If the problem is in the microcircuit or firmware - only replacement.