Installation instructions

Residual engine heat utilization

83.4

Model 124 left-hand steering
(not for vehicles with stationary heater)

Procedure

All vehicles

1

Disconnect ground cable from battery.

Note:
Find out code for coded radio.

2

Remove both front foot mats.

3

Remove foot support in right front footwell.

4

Remove cover at bottom of right A-pillar.

5

Remove right bottom section of cover below
instrument panel.

6

Remove cover below instrument panel on
left (68-150).

7

Remove side paneling on left and right of
center console.

8

Remove instrument cluster.

9

Remove left side nozzle and left air hose.

a

Cover, top section

b

Cover, bottom section

c

Instrument cluster

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

10 Remove cover on radio or two-way radio,

remove radio and cover on heater control.

A2

Radio

a

Cover on heater control

b

Cover on two-way radio

11 Loosen pushbutton control module
(N18, N19/1 or N22) and put down at side.

N18

Heater pushbutton control module

a

Screw

12 Screw REST time-limit relay module (N11/4)

to hole present in support plate with sheet
metal screw.

a

Support plate

N11/4

REST time-limit relay module

P83.75-0203-13

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

13 Remove cover from fuse and relay box
(6 screws), loosen fuse carrier (arrow) and put
down at side.

14 Loosen relay holder and put down at side.

For this purpose press fuse and relay box
apart (arrows).

15 Clip connector for wiring harness auxiliary

fuse holder (engine residual heat utilization
system) into relay box section F.

16 Attach auxiliary fuse holder to connector in

section F and insert 16 A fuse into circuit 4.

Location of auxiliary fuse holder (F10)
16

Amperes (circuit 4)

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

17 Disconnect black/pink wire or wires (with

sliding roof) from fuse 7 (output) and connect
black/red wire from auxiliary wiring harness
in their place. Connect previously
disconnected black/pink wire from auxiliary
wiring harness to 1-pin connector (X93).

X93

Tempmatic A/C terminal block
(REST)

18 Connect red wire from auxiliary wiring

harness to terminal block (X4) circuit 30.

19 Install fuse carrier and cover for fuse and

relay box.

X4 Terminal block, circuit 30, relay/fuse box

On vehicles with automatic air conditioning
items 20-23 are eliminated.

20 Disconnect connector for blower motor

preresistor group (R14, arrow) and open.

21 Remove green/blue wire from connector pin 1

and replace with plug sleeve for green wire
from auxiliary wiring harness.

22 Close connector and plug back into

preresistor group.

X76/ 1

Air volume switch connector (REST) (1-pin)

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

23 Install connector housing on green/blue wire

removed and connect with round plug on
green/blue wire from auxiliary wiring harness
(connector X76/1).

X76/ 1

Air volume switch connector

(REST) (1-pin)

24 Connect brown wire from auxiliary wiring

harness to main ground point (W1).

W1

Main ground
(behind instrument cluster)

P83.75-0204-13

25 Route auxiliary wiring harness to center

console so that it cannot chafe. Tie down as
required.

26

Unclip switch mount grate. Clip in 6-pin
connector (arrow) for auxiliary wiring
harness. Attach switch (S46/3) and
reinstall switch mounting grate.

a

Auxiliary wiring harness

b

Switch mounting grate

P83.75-0200-13

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

27 Connect grey/blue wire from auxiliary wiring

harness to terminal block (X6).

X6

Terminal block, circuit 58d

Only with automatic A/C

28 Disconnect right connector (arrow) from

pushbutton control module and insert green
wire from auxiliary wiring harness into vacant
chamber 13 on connector. Then reinstall
connector.

N22 A/C pushbutton control module

(automatic A/C)

29 Route tie-out from wiring harness with 3-pin

intermediate connector to blower regulator/
interior harness connector (X64).

X64 Blower regulator/interior harness

connector

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

30 Disconnect connector from blower regulator/

interior harness connector (X64). Connect
intermediate connector from auxiliary wiring
harness and connector to intermediate
connector.

X64/2

REST blower regulator
intermediate connector

All vehicles
31 Lay auxiliary wiring harness to front right

footwell, connect to time-limit relay module
and fasten with present cable strap.

32 Install foot support.

a

Auxiliary wiring harness

b

Cable strap

N11/ 4

REST time-limit relay module

P83.75-0202-13

33 Cut out hole for switch in cover or use new

cover with switch cutout.

S46/3

REST pushbutton switch

P83.75-0201-13

34 Install instrument cluster
35 Install air nozzle and air hose.
36 Install pushbutton control module
(N18, N19/1 or N22).
37 Install all panels and covers removed.
38 Reconnect ground lead to battery.
39 Check for proper function.

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

P83.75-0206-55

Wiring harness for residual engine heat utilization system with automatic heater (HEAT) and air
conditioning (Tempmatic)

Fuse and relay box

Terminal block (circuit 30, fuse and relay box)

F1/ 7

X4

Fuse 7 (black/red wire)

(red wire)

Auxiliary fuse holder (HEAT)

F10

X6

Terminal block (circuit 58d) (2-pin)
(grey/blue wire)

REST time-limit relay module

N11/ 4

X76/ 1

Air volume switch connector (REST) (1-pin)

Blower motor preresistor group

R14

(green wire)

X93

Tempmatic A/C terminal block (REST) (black/

REST pushbutton switch

S46/ 3

pink wire)

W1

Main ground (behind instrument cluster)
(brown wire)

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

P83.75-0207-55

Wiring harness for residual engine heat utilization system with air conditioning (automatic)

Fuse and relay box

Terminal block (circuit 30, fuse and relay box)

F1/ 7

X4

Fuse 7 (black/red wire)

(red wire)

Auxiliary fuse holder (HEAT)

F10

X6

Terminal block (circuit 58d) (2-pin)
(grey/blue wire)

REST time-limit relay module

N11/ 4

X64/ 2

REST blower regulator intermediate connector

A/C pushbutton control module (automatic (AC)

N22

(yellow wire)

X93

Tempmatic A/C terminal block (REST) (black/

REST pushbutton switch

S46/ 3

pink wire)

W1

Main ground (behind instrument cluster)
(brown wire)

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

P83.75-0208-59

Wiring diagram, residual engine heat utilization system with automatic heater (HEAT) and air
conditioning (Tempmatic)

Air volume switch illumination

E9/6

S46/3

REST pushbutton switch

Fuse and relay box

F1

W1

Main ground (behind instrument cluster)

Fuse 7, circuit 15

F1-7

X4/1

Terminal block (circuit 30, interior)

Fuse 12, circuit 15X

F1-12

X6

Terminal block (circuit 58d) (2-pin)

Auxiliary fuse holder (HEAT)

F10

X76/1

Air volume switch connector (REST) (1-pin)

Blower motor

M2

X93

Tempmatic A/C terminal block (REST), 1-pin

Coolant circulation pump

M13

X93x1

Tempmatic A/C terminal block connector (REST)

REST time-limit relay module

N11/4

Y21

Duovalve

A/C pushbutton control module (Tempmatic A/C)

N19/1

Blower motor preresistor group

R14

Blower switch

S3

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)

P83.75-0209-59

Wiring diagram, residual engine heat utilization system with air conditioning (automatic)

Fuse and relay box

F1

W1

Main ground (behind instrument cluster)

Fuse 7, circuit 15

Terminal block (circuit 30, interior)

F1-7

X4/1

Fuse 12, circuit 15X

Terminal block (circuit 58d) (2-pin)

F1-12

X6

Auxiliary fuse holder (HEAT)

F10

X11/4

Data link connector

Blower motor

M2

X64/2

REST blower regulator intermediate connector

REST time-limit relay module

N11/4

X93

Tempmatic A/C connector (REST), 1-pin

A/C pushbutton control module (automatic A/C)

N22

X93x1

Tempmatic A/C terminal block connector (REST)

Electric blower regulator

N29

S46/3

REST pushbutton switch

Parts ordering note

The parts required for installation are given in the following parts documents:

Kit

SA 56.547

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© Daimler AG, 12.07.12, G/03/09 / ea8304pb3es00x / 83.04 - Installation instructions: Residual engine heat utilization system Model 124.1/3, LHD (except for vehicles with stationary heater)