Remove/install tuner unit

AR82.60-P-2002LWP

Remove/install tuner unit

12.08.2019

Model

238.4

with code 522 (Audio 20 radio)

with code 536 (Sirius satellite radio complete system)

Model

238.4

with code 522 (Audio 20 radio)

with code 537 (DAB digital radio standard (Digital Audio Broadcast))

Shown with code B01 (48V technology)

1

Bolts

5

Bracket

2

Bracket

6

Electrical connectors

3

Nut

7

Bolts

4

Screw

A90/4

Tuner unit

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on avoiding damage to optical fibers during repair work

AH82.60-P-0001-05AK

 

Remove/install

1

Carry out initial startup of tuner unit (A90/4)

When replacing tuner unit (A90/4).



AD00.00-P-2000-06LWO

2

Switch off ignition and store transmitter key outside of transmission range (min. 2  m)

3

Remove trunk recess cover

AR68.30-P-4600LWO

4

Remove on-board electrical system battery

Model 238.4
with code 522 (Audio 20 radio)
with code 536 (Sirius satellite radio complete system)
with code B01 (48V technology)
Model 238.4
with code 522 (Audio 20 radio)
with code 537 (DAB digital radio standard (Digital Audio Broadcast))
with code B01 (48V technology)

AR54.10-P-0009LWK

5

Remove screws (1) and lift up bracket (2) far enough to gain access to the nut (3) under the bracket (2)

Model 238.4
with code 522 (Audio 20 radio)
with code 536 (Sirius satellite radio complete system)
with code B01 (48V technology)
Model 238.4
with code 522 (Audio 20 radio)
with code 537 (DAB digital radio standard (Digital Audio Broadcast))
with code B01 (48V technology)

6

Remove parking system control unit from bracket (5)

Model 238.4
with code 235 (Parking Pilot with PARKTRONIC)
with code 522 (Audio 20 radio)
with code 536 (Sirius satellite radio complete system)
except code B01 (48V technology)
Model 238.4
with code 235 (Parking Pilot with PARKTRONIC)
with code 522 (Audio 20 radio)
with code 537 (DAB digital radio standard (Digital Audio Broadcast))
except code B01 (48V technology)

AR54.65-P-0018LWP

 The electrical connectors on the parking system control unit must not be disconnected.

7

Unscrew nuts (3)

8

Remove bolts (4)

9

Lift up bracket (5) with tuner unit (A90/4)

10

Disconnect electrical connectors (6) and cover fiber-optic cables

11

Remove screw/bolts (7)

12

Remove tuner unit (A90/4) downwards from bracket (5)

13

Install in the reverse order