Removing and installing seat height adjustment motor: Audi A4 B8

🧭 Before you start

Fits: Audi A4 B8 (8K, 2007–2015)

• Renewed: all self-locking bolts

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• The bushes cannot be renewed with the equipment available to workshops.The corresponding components must be renewed if the bushes are damaged. — Swivel up upper seat pan frame (1) as far as possible.
• Make sure electrical connectors are fitted correctly (as far as stop) and engage audibly.
• If the airbag warning lamp K75 indicates a fault following installation, you must interrogate, erase and then re-interrogate the event memory .

📋 Procedure

1. ⚠ Observe safety regulations for pyrotechnic components .Before handling pyrotechnic components (e.g. unplugging the electrical connector) the mechanic must discharge any static electricity. This can be done by briefly touching the door striker plate, or similar. — Remove trim (tunnel side) .
2. Remove trim (sill side) .
3. Unplug electrical connector (1) at seat height adjustment motor (2).
4. Slacken off torsion bar.
5. ⚠ Risk of (irreparable) damage to threaded hole in seat pan.Bolted connection for adjustment spindle to seat pan must be free of strain when fitting/removing bolt.Risk of damage to bush (3) in pivot point (bolted connection between adjustment spindle and seat pan).The bush cannot be renewed with the equipment available to workshops.The relevant components must be renewed if the bush is damaged.Risk of damage to thread of bolt (2).Bolt for adjustment spindle has left-hand thread. — Unscrew bolt (2) at adjustment spindle (1) of seat height adjustment motor.

6. Unscrew bolt (2) for adjustment spindle (1) of seat rake adjustment motor (pre-set at factory).
7. When removing bolt (2), take care not to damage bushes (1) inserted in pivot points.
8. ⚠ The bushes cannot be renewed with the equipment available to workshops.The corresponding components must be renewed if the bushes are damaged. — Swivel up upper seat pan frame (1) as far as possible.
9. Use a suitable block of wood (6) to support upper seat pan frame on seat repair standVAS 6136(item 2).
10. Remove bolts (3) (2x).
11. Detach retainer (5) with seat height adjustment motor (4) from seat pan.
12. Remove bolts (1).
13. Separate retainer (2) and seat height adjustment motor (3).
14. ⚠ Observe safety regulations for pyrotechnic components .Before handling pyrotechnic components (e.g. plugging in the electrical connector) the mechanic must discharge any static electricity. This can be done by briefly touching the door striker plate, or similar. — Clean threaded holes for self-locking bolts, using e.g. a thread tap.
15. Renew all self-locking bolts.
16. Secure adjustment spindle (1) of seat rake adjustment motor (pre-set at factory) with bolt (2).
17. Take care not to damage bush (1) when inserting bolt.
18. ⚠ If strain on bolt connection adjustment spindle/seat pan is not relieved when unscrewing or bolting on, threaded hole in seat pan will be damaged or destroyed.Risk of damage to thread of bolt (2).Bolt for adjustment spindle has left-hand thread. — Take care not to damage bush (3) when inserting bolt (2). [Note: Make sure electrical connectors are fitted correctly (as far as stop) and engage audibly.]
19. ⚠ The battery must be connected with the ignition switched on. If pyrotechnic components (e.g. airbag or belt tensioner) are inexpertly repaired, this may result in unwanted triggering after connecting the battery. There must not be anyone in the vehicle while you are connecting the battery. — With ignition switched on, connect battery earth wire Electrical system27Battery; Disconnecting and connecting battery. [Note: If the airbag warning lamp K75 indicates a fault following installation, you must interrogate, erase and then re-interrogate the event memory .]

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