EBA – 01 29 9 790 029
BMW Installation Instructions
(For use in the BMW dealer organisation only). Specialised knowledge is required.
Installation time is approx. 3 hours, though this may vary depending on the condition of the vehicle and its fittings.
Knowledge of electrics is required.
Instructions and illustrations are given for left-hand drive models (LHD). Certain work steps must be carried out in mirror-image fashion for right-hand drive models (RHD).
Lay the cables so that they can be neither kinked nor squashed.
The seat heating is ready for operation when the ignition key is in position 2 (term. 15).
If the car is equipped with electric seat adjustment, the electrical connections for seat-cushion and seat- backrest heating may already be provided. In this case, cable strand B is not required and the work steps detailed in Chapter 4 can be ignored.
The seat and backrest covers and the switch cover must be ordered separately.
Tools and materials required
Open-end adjustable spanner, 10 mm A/F
Ratchet with 1/2″ drive
1/2″ Torx insert T50
Allen key, 2.5 A/F
Open-end adjustable spanner, 13 mm A/F
Torx screwdriver T10
- Car Preparation/Removal Tasks
- Supplementary Wiring Harnesses
- Installing Power-Supply Cable
- Installing Seat Wiring Harness
1. Car Preparation/Removal Tasks
Print out fault memories.
Install seat cover for backrest and seat cushion with heater elements.
Remove instrument cluster.
Remove storage tray from instrument panel, bottom left.
Remove glove compartment and panel below glove compartment.
Remove radio/on-board monitor at front completely. Remove cover strip below heating control.
Remove fuse strip below glove compartment.
Additional tasks when installing driver’s seat heater:
Remove entrance strip on driver’s side.
Remove centre-console panel in footwell on driver’s side.
Remove footwell panel below instrument panel on driver’s side.
Additional tasks when installing passenger seat heater:
Remove entrance strip on passenger’s side.
Remove A-pillar panel in footwell on passenger’s side. Remove centre-console panel in footwell on passenger’s side.
Remove footwell panel below instrument panel on passenger’s side.
2. Supplementary Wiring Harnesses Diagram
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|Item||Version/designation||Cable colour||Connection location in car||Short designat./ plug-in station|
|A1||Flat contact connector/tm. 15<32||green/black/yellow||Fuse carrier behind glove compartment||X10015/64|
|A2||6-pin yellow jack housing||Centre console in switch strip: driver’s side Centre console in switch strip: passenger’s side||X651
|A3||Fan connector, 3-pin||green/black/yellow||Fan-connector box behind glove compartment, passenger’s side||X1447|
|A4||Fan-connector contact/tm. 31||brown/black||Fan-connector box under instrument panel, driver’s side||X217|
|A5||Fan-connector contact/tm. 58g||grey/red||Fan-connector box under instrument panel, driver’s side||X908|
|A6||Jack contact/tm. 31||brown||Black 6-pin jack housing: driver’s side Black 6-pin jack housing: passenger’s side||X275/1
|A7||Jack contact/NTC||white/blue||Black 6-pin jack housing: driver’s side Black 6-pin jack housing: passenger’s side||X275/2
|Item||Version/designation||Cable colour||Connection location in car||Short designat. plug-in station|
|A8||Jack contact/HZ||white/yellow||Black 6-pin jack housing: driver’s side Black 6-pin jack housing: passenger’s side||X275/3
|B||Seat wiring harness|
|B1||Black 3-pin pin housing||brown and yellow/white||Jack housing on backrest: driver’s side Jack housing on backrest: passenger’s side||X732
|B2||White/black 3-pin pin housing||brown, white/yellow and white/blue||Jack housing on seat cushion: driver’s side Jack housing on seat cushion: passenger’s side||X733
|1||Pin housing||For pressed-out pin contact (lumbar only)|
|B3||Pin contact/NTC||white/blue||Black 6-pin pin housing on seat: driver’s side Black 6-pin pin housing on seat: passenger’s side||X275/2
|B4||Pin contact/HZ||white/yellow||Black 6-pin pin housing on seat: driver’s side Black 6-pin pin housing on seat: passenger’s side||X275/3
|B5||Pin contact/tm. 31||brown||Black 6-pin pin housing on seat: driver’s side Black 6-pin pin housing on seat: passenger’s side||X275/1
|B6||Jack housing||brown||black 1 -pin jack housing||X6500|
3. Installing Power-Supply Cable
Instructions and illustrations are given in this chapter for left-hand drive models. The work steps must be carried out in mirror-image fashion for right-hand drive models.
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For installation of the driver’s and passenger seat heaters, the seat connections A6-A8 are laid differently. The illustration shows a left-hand drive model. For right-hand drive models, the illustration must be used in mirror-image fashion.
Lay power-supply cable along vehicle wiring harness:
Branch A1 to fuse carrier.
Branch A2 to centre console, switch strip.
Branch A3 to fan-connector box, passenger’s side. Branches A4/A5 to fan-connector box, driver’s side. Branches A6-A8 to 6-pin jack housing, X275 or X279, under the seat.
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If fuse no. 32 is already assigned, branch A1 is insulated and tied back.
Connect branch A3, green/black/yellow, to same- colour fan connector X1447 in fan-connector box behind glove compartment.
If fuse no. 32 is not assigned, lay branch A1, green/ black/yellow, to fuse strip X10015 (1) and press into plug-in station no. 64. Insert 15A fuse in plug-in station no. 32.
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If the fan-connector box is already fully assigned, fan connector A3 is tied back to the vehicle wiring harness with a cable strap.
Secure branch A3, green/black/yellow X1447, in fan- connector box (1) behind glove compartment.
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Lay branches A6/A7/A8 along vehicle wiring harness and press into jack housing X275 or X279 (1) under seat.
|Branch||Cable colour||Plug-in station|
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Depending on the car’s fitted equipment, the cover for the switch strip may differ in length and must therefore be ordered separately from the Electronic Parts Catalogue (EPC).
Lay branch A2 (yellow 6-pin jack housing) along vehicle wiring harness to centre console. Connect seat-heating switch S53 or S54 provided and press into retaining frame. Clip in cover for switch strip.
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If the required fan connector is already completely assigned, the branch is connected to the cable with the largest cross-section in the fan connector.
Lay branches A4, brown/black, and A5, grey/red, along vehicle wiring harness to fan-connector box (1) under instrument panel on driver’s side.
Lay branch A4, brown/black, to same-colour fan connector X217.
Lay branch A5, grey/red, to same-colour fan connector X908.
4. Installing Seat Wiring Harness
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Depending on the equipment fitted, the seat may already be prewired.
On the seat with lumbar support, plug-in station 1 is already assigned with a cable, brown (0.5 mm2).
Press brown cable for lumbar support out of pin housing X275 or X279 and press branch B5, brown (1.5 mm2), into plug-in station 1. Insert pressed-out pin contact into supplied pin housing and connect with branch B6, X6500 brown (0.5 mm2).
If branch B6, brown (0.5 mm2), is not required, tie branch back to seat wiring harness with a cable strap. Lay branches B3/B4/B5 to pin housing X275 or X279 (1) as follows:
|Branch||Cable colour||Plug-in station|
|B5||brown 1.5 mm2||1|
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Lay branch B1, black 3-pin pin housing, to backrest on left side of seat under shaft for backrest adjustment. Connect branch B1, X732 or X741, with jack housing of backrest cover (1) and secure plug connection to seat frame with clip (2).
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Connect branch B2, white/black 3-pin pin housing, with jack housing X733 or X740 (1) of seat cover. Secure wiring harness to seat base with cable straps.
Reinstall all parts that have been removed in reverse sequence.
Carry out a test for correct operation.
Coding is not applicable to this system.
This article was last modified on June 9, 2018, 9:47 am