Vehicle scope and preparation
This guide uses Mercedes-Benz C-Class 205 as its source installation example. The original article also lists GLC253, E-Class 213, S-Class 222, GLE167 and GLS167 as references and says they can be used as comparisons. That statement does not establish common seat construction, vehicle year/configuration coverage, modules, terminals, SRS systems or foam-cutting requirements. Fitment for the actual vehicle remains unconfirmed.
The source says programming/coding is needed for this retrofit to operate, but supplies no vehicle-specific parameters or accepted procedure. It says some configurations lack a door ventilation-switch opening and require a different door panel. Its instruction to protect the interior, steering wheel and door trim while moving the seat is retained as a source caution.
Technical limits: The source mentions switching off ignition before unplugging seat connectors. It does not provide a verified supply-isolation or airbag/SRS procedure, a waiting period, belt/occupancy-system handling, refastening torque or post-work safety checks. The photo reader below documents what the source shows; it is not approval to unplug connectors, drill, cut foam or modify a heating pad.
Ventilation-switch circuit and source ambiguity
The written source names door-controller connector No. 6 (12-pin) and lists switch terminal 1 against pin 7. It repeats switch terminal 2 against both pins 8 and 9. That switch-side assignment remains ambiguous. The circuit fragment and its Code 275 / No Code 401 / No Code 873 labels do not resolve it or establish programming instructions. No executable switch-pin mapping or coding plan is provided.
Source 001: circuit fragment and printed code legend
This source circuit fragment prints “Code 275,” “No Code 401” and “No Code 873,” together with LIN B5, S22 and conductor labels 0.13 RD, 0.13 BN and 0.13 VT. These are labels in the archived diagram, not programming settings supplied for the reader. The article separately repeats ventilation-switch terminal 2 for door-controller connector pins 8 and 9.
Source limits: The small, cropped circuit fragment does not resolve that repeated-terminal ambiguity or establish a complete switch, connector, vehicle or coding configuration. No executable pin assignment or coding procedure is accepted.
Separate heating and ventilation source table
The source table separates seat heating from seat ventilation and cushion from backrest. The English reading below records all eight printed rows for historical comparison only. It does not verify the actual module, connector orientation, terminal functions, polarity, electrical ratings or safe connection procedure; no direct connection is authorized by the listed source numbers.
Source 002: separate heating and ventilation rows
The source table separates heating from ventilation. Its printed heating entries are: cushion—red, under-seat module connector 3 (purple), pin 4; black, connector 3 (purple), pin 5. Backrest—red, connector 2 (blue), pin 4; black, connector 2 (blue), pin 1. Its printed ventilation entries are: cushion—red, connector 3 (purple), pin 25; black, connector 3 (purple), pin 18. Backrest—red, connector 2 (blue), pin 17; black, connector 2 (blue), pin 11.
Source limits: This is a reading of the source table only. Heating and ventilation rows must not be combined or treated as a verified connection plan. Actual module/connector identity, terminal functions, polarity, electrical ratings and power/SRS isolation are not established.
Source tools and supplies
The tools and supplies below are those printed in the source. In particular, the 65 mm hole saw is a listed tool, not a confirmed hole size or cutting requirement. Rivet/drilling, trim removal and seat refitting requirements depend on the actual seat and remain unverified.
Source 003: tool and supply list
The source list names a ratchet, E12 socket, small and large flathead screwdrivers, small rivets, a rivet gun, a 65 mm hole saw, an electric drill, a magnetic pickup tool, T20/T25/T30 drivers, a utility knife and a marker. Its supplies are cable ties and fabric adhesive tape.
Source limits: The printed 65 mm size is a source tool specification, not an approved hole diameter for any seat. Rivet size, drilling locations, clearances, fastener torque and safe cutting requirements are not supplied.
Seat disassembly source photo reader
The ten photo groups below preserve the complete original Chinese disassembly strip in its source order. Headrest parts pictured are guide sleeves and seat-back retainers are clips. Each action is described as a source example; SRS/electrical and mechanical acceptance remain open.
Source 004 · band 01/10: door switch and seat-rail screws
The source shows a hole saw, then describes removing the door panel to replace the ventilation switch. It describes adjusting the seat position and removing four seat-rail retaining screws labelled E12.
Source limits: This is the source example, not an accepted door-panel or seat-removal procedure. No drilling location, switch-opening geometry, seat fastener torque or SRS/power-isolation procedure is provided.
Source 004 · band 02/10: side trim, belt and connectors
The source describes removing the seat-side trim and seat belt, switching off the ignition, disconnecting all seat-computer connectors and lifting out the seat. Its next caption identifies concealed seat-back-panel clips.
Source limits: The source only mentions ignition off. It does not supply an accepted supply-isolation, airbag/SRS or belt-system procedure, waiting period or connector-handling requirements. These descriptions do not authorize disconnection.
Source 004 · band 03/10: concealed back-panel clips
The source describes lifting the pictured black area with a large flathead screwdriver. It warns that pressure at other places may separate and damage the clip and back panel, asks that the panel not be damaged, and identifies the pictured clip-release contact face.
Source limits: The source marks a contact area on this particular panel but supplies no release force or verified removal method for other panels. These concealed retainers are clips, not seat-belt buckles.
Source 004 · band 04/10: headrest and guide sleeves
The source describes removing the headrest and disconnecting all backrest connectors. It then shows removal of the headrest guide sleeves and a close-up of their clipped-in state inside the seat.
Source limits: The pictured plastic components are headrest guide sleeves. The photos do not identify every connector or provide an accepted SRS/electrical-disconnection or guide-release procedure.
Source 004 · band 05/10: released guide sleeve and next assembly
The source shows the guide sleeve in its released state and says the clip must reach the pictured state for the sleeve to be removed. The next photo begins the rear entertainment connector assembly, whose caption continues in the following band.
Source limits: Only the photographed clip states are described. No hidden retaining feature, release force or universal headrest guide design is inferred. The cut between bands is a crop boundary, not an added installation step.
Source 004 · band 06/10: rear entertainment connector and clips
The source describes removing the rear entertainment quick connector assembly, then identifies concealed clip positions after removal and on the removed part. The lower photo begins separating the seat back from its frame.
Source limits: These are the source labels for the pictured assembly. They do not establish its connector functions or a universal electrical/media-port connection method. The separation caption continues in the next band.
Source 004 · band 07/10: seat back, side trim and lumbar switch
The source describes separating the seat back from its frame, removing the cushion-side trim and disconnecting the lumbar-support switch connector. A drill is visible in the bracket-removal photos.
Source limits: The source supplies no accepted lumbar-switch disconnection method, drill depth, hole/rivet specification or clearance from wiring and SRS components. A drill in a photo is not approval to drill this or another seat.
Source 004 · band 08/10: side bracket, rivets and thigh support
The source describes removing the side-trim bracket, removing rivets to take off that bracket, and removing the thigh-support trim.
Source limits: These are source-described actions only. Rivet type/size, drilling and refastening method, fastener strength, clearances and thigh-support fitment remain unverified.
Source 004 · band 09/10: trim clips and thigh-support upholstery
The source shows trim-clip details and describes separating the thigh-support upholstery cover. The last photo starts the upholstery retaining-ring removal shown with its caption in the next band.
Source limits: The visible upholstery attachment is recorded without adding a removal tool, force, replacement ring specification or approved refitting method. The next caption belongs to the continuing original photo.
Source 004 · band 10/10: upholstery and foam separated
The source describes removing upholstery retaining rings and separating the seat upholstery from the seat foam. Its final photo is labelled “after separation.”
Source limits: This is the final short band of the original disassembly strip. The photo is not proof of a complete or safely reversible removal/refitting procedure.
Fan installation source photo reader
The seven photo groups below preserve the complete original Chinese fan-installation strip. They retain the source cautions about fan-blade interference and pulling wires, and separately identify its 5 cm foam-depth statement, unspecified passenger-sensor distance, heating-pad cuts and claimed benefits. None of these supplies an approved cutting or modification specification.
Source 005 · band 01/07: foam and source mounting positions
The source introduces making openings in the cushion and backrest foam and states that the backrest has reserved factory fan mounting positions. The next cushion photo continues into the following band.
Source limits: Reserved mounting positions are a source claim about the pictured foam, not proof that all listed seats have them. No approved hole size, depth, location or clearance is established.
Source 005 · band 02/07: cushion positions, heating pad and foam
The source states that the cushion also has reserved factory fan mounting positions. It describes separating the heating pad depending on the configuration, and removing the foam pad. The following photo starts a shape template.
Source limits: The source itself makes heating-pad handling configuration-dependent. Sensor/heating-element construction, safe separation and whether the pictured mounting positions apply to the actual seat remain unverified.
Source 005 · band 03/07: shape template, mesh and backrest openings
The source describes tracing the shape of the removed foam pad and cutting the mesh to the same shape, then making openings in the backrest foam.
Source limits: The shape and openings belong to the source example. No accepted cutting template, dimensions, hole depth or approved separation from heating elements/sensors is supplied.
Source 005 · band 04/07: backrest fans, wire caution and mesh
The source shows backrest fan installation, warns that wiring must not interfere with the fan blades or be pulled, and describes installing ventilation mesh.
Source limits: These are source-described appearances and cautions, not a verified routing plan. Wire retention, fan seating, clearance, electrical integrity and operating performance remain unconfirmed.
Source 005 · band 05/07: upholstery channel and heating-pad cutting
The source note describes treating the illustrated groove so there is room for the upholstery retaining strip in the middle. It depicts cutting the heating pad and claims that this improves heat dissipation. The cushion-fan installation photo continues into the following band.
Source limits: The groove note is small and its middle wording is awkward; only its visible retaining-strip context is translated. No cut pattern, heating-pad modification approval or measured heat-dissipation result is established.
Source 005 · band 06/07: cushion fans, passenger sensor and 5 cm claim
The source identifies cushion-fan installation positions and warns not to pull the wires. It states that the passenger seat has a cushion sensor and warns that openings must not be too far inward. It then labels excavation of the middle cushion surface to a depth of 5 cm.
Source limits: The 5 cm statement is source-only, not an approved cutting depth. The source gives no sensor boundary, minimum sensor distance, remaining foam thickness or accepted occupancy/SRS-system protection and test procedure.
Source 005 · band 07/07: flush mesh, airflow claim and coding check
The source describes installing ventilation mesh level with the cushion surface. It depicts cutting the heating pad and claims increased airflow. The final caption calls for checking ventilation operation after coding.
Source limits: No approved heating-pad cutting method, measured airflow benefit, coding parameters, complete functional test or vehicle handover result is supplied. A pictured switch or source instruction does not establish that operation passed.
Source troubleshooting and handover statements
1. The source associates an unresponsive ventilation switch with coding or wiring and calls for checking them. It gives no accepted diagnostic sequence or confirmed cause.
2. The source associates a switch lighting up and then switching off with reversed fan wiring. This is an unverified source troubleshooting suggestion, not a verified polarity test or instruction to reverse wires.
3. The source associates a non-rotating cushion or backrest fan with reversed wiring, an open circuit or a short circuit. Connector definitions, electrical tests and a confirmed fault-isolation result are absent.
4. The source associates abnormal fan noise with foreign material, contact with wires or incorrect installation seating. No actual fan sound was reviewed and no fault or noise-performance claim is accepted here.
5. The source calls for checking all functions and clearing fault codes before returning the vehicle. No coding parameters, complete safety/functional acceptance checklist, measured result or handover evidence is supplied; clearing faults is not proof that their causes were resolved.
Review limits: Exact vehicle/seat fitment, ambiguous switch pins, module and electrical definitions, supply/SRS isolation, belt and occupancy-sensor handling, rivet/drill specifications, refastening torque, 65 mm applicability, 5 cm foam depth, heating-pad cut approval, sensor clearance, coding, diagnostic causes and vehicle handover remain open. This batch contains image/text reading only: no video frames, no audio listening and no technical or publication approval.
CKCP tutorial reference: CKCP source archive