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Volume 1.1

Diagnostic Manual, Body and Accessories,
Volume 5

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15.4 Model 208, 210 as 3/97 Electric Seat Adjustment (ESA) > 13 Diagnosis - Function Test, Recalling Actual Values with HHT

Diagnosis - Function Test, Recalling Actual Values with HHT

CAUTION!
Injury hazard from pinching and crushing, in extreme cases extremities can even be severed when caught in the mechanism.
When working on components activated via hand, electrically via motors, hydraulically, pneumatically via linkages, it is possible that severe injury can result in the severing, pinching, or crushing of body parts.
Do not allow any body parts to be in the general area of the moving components.
Protective measures:
- Supervise work.
- Do not reach into the moving mechanism at any time during any tests.
- Keep away from the moving mechanism of components which are being activated via the HHT and or directly via circuit 30.
- Ensure that all test cables are of sufficient length.

Preparation for Function Test, Recalling Actual Values:
1. Review

12,

20,

21,

31,
2. Fuses ok,
3. Battery voltage ok,
4. Connect the Hand-Held Tester (HHT) to X11/4, according to diagram, see section 0,
5. Voltage supply for control module and CAN-data wiring ok, refer to DM Body and Accessories, Volume 2.1, section 7.1, > 23,
6. All CAN-data wiring contacted,
7. Ignition ON, or open relevant left door,
8. Additional test for seatback activation: vehicle speed < 5mph
(Model 208 only).

Function sequence:
The voltage-coded signals from the power seat switches (S91/1, S92/2) are read into the associated door control modules (N69/1, N69/2). The door control modules (N69/1, N69/2) send a CAN message to the associated ESA control module (N32/1, N32/2) which actuates the seat adjustment motors.
Actual values and activations from one system may be stored in several control modules, therefore the actual values and activations of control modules which are relevant to the system should be retreived.
When retreiving actual values, all available actual values from the respective control module appear.

Abbreviations:

Electric seat adjustment, left

Electric seat adjustment, right

Electronic ignition switch/lock control module (N73)

Pneumatic system equipment (A37)

Front driver door control module (N69/1)

Front driver door control module (N69/2)

The abbreviations listed above are found in the second column of the following test table test steps and they indicate in which control module(s) the actual values or activations are stored.

Test equipment; See MBUSA Standard Service Equipment Program

Description Brand, model, etc.

Digital multimeter Fluke models 23, 77 III, 83, 85, 87

Test scope Test connection Activation Nominal value Possible cause/Remedy 1)

1.0
Circuit 15

Ignition switch position 2:
ON
OFF

23 4.0

2.0 Door switch

< 10.0 V
> 10.0 V
DM, Body and Accessories,
Vol. 1.1, section 3.4, >23 PSE

3.0 Door switch

> 15.5 V
< 15.5 V
DM, Body and Accessories,
Vol. 1.1, section 3.4, > 23 PSE

4.0 Left front ESA motor group (with memory)
fore/aft motor (M27m1)
(Hall sensor)

Left front ESA switch group (with memory) fore/aft switch (S91/2s1)

Press switch forward:

Press switch aft:

Value increases, seat moves forward.

Value decreases, seat moves backward.
Wiring,
23 2.0

5.0 Left front ESA motor group (with memory) rear raise/lower motor (M27m2)
(Hall sensor)

Left front ESA switch group (with memory) raise/lower switch (S91/2s2)

Press switch up:

Press switch down:

Value increases, seat rises at rear.

Value decreases, seat lowers at rear.
Wiring,
23 8.0

6.0 Left front ESA motor group (with memory) front raise/lower motor (M27m3)
(Hall sensor)

Left front ESA switch group (with memory) fore/aft switch (S91/2s1)

Press switch up:

Press switch down:

Value increases, seat rises at front.

Value decreases, seat lowers at front.
Wiring,
23 5.0

7.0 Left front ESA motor group (with memory), head restraint raise/lower motor (M27m4)
(Hall sensor)

Left front ESA switch group (with memory), head restraint raise/lower switch (S91/2s4)

Press switch up:

Press switch down

Value increases, head restraint rises.

Value decreases,
head restraint lowers. Wiring,
23 14.0

8.0 Left front ESA motor group (with memory), backrest fore/aft motor (M27m5)
(Hall sensor)

Left front ESA switch group (with memory), backrest fore/aft switch (S91/2s5)

Press switch forward:

Press switch aft:

Value increases, backrest moves forward.

Value decreases, backrest moves backward. Wiring,
23 11.0

9.0 Left front seat back release microswitch (S91/3)
(Model 208 up to 6/98)

Left front seatback release microswitch (S91/3) or left front hibernation
microswitch (S91/1s2)
(Model 208 as of 06/98 only)

Seat back:

Unlocked:

Locked:

Seat back:
Unlocked and tilted only 20 degrees forward:

Tilted completely forward and locked:

23 19.0
Left front ESA control
module (N32/1).

23 20.0
Left front ESA control
module (N32/1).

10.0 Left front seatback inclination microswitch (S91/1)
(model 208)

Seat back tilted:

Forward:

Backward:

23 21.0
Left front ESA control module (N32/1).

11.0 Left front door ESA switch group (with memory), fore/aft switch (S91/2s1)

S91/2s1 pressed forward:

S91/2s1 pressed backward:

23 1.0

12.0 Left front door ESA switch group (with memory), front raise lower switch (S91/2s3)

S91/2s3 pressed up:

S91/2s1 pressed down:

23 4.0

13.0 Left front door ESA switch group (with memory), rear raise lower switch (S91/2s2)

S91/2s2 pressed up:

S91/2s2 pressed down:

23 7.0

14.0 Left front door ESA switch group (with memory), backrest fore/aft
switch (S91/2s5)

S91/2s5 pressed forward:

S91/2s5 pressed aft:

23 10.0

15.0 Left front door ESA switch group (with memory), head restraint
raise/lower (S91/2s4)

S91/2s4 pressed up:

S91/2s4 pressed down:

23 13.0

16.0 Left front door ESA switch group (with memory), memory button 1
switch (S91/2s6)

Button 1: Rest position:

Press button:

23 17.0

17.0 Left front door ESA switch group (with memory), memory button 2
switch (S91/2s7)

Button 2: Rest position:

Press button:

23 17.0

18.0 Left front door ESA switch group (with memory), memory button 3
switch (S91/2s8)

Button 3: Rest position

Press button:

23 17.0

19.0 Left front door ESA switch group (with memory), memory store
button (S91/2s9)

Green button:
Rest position:

Press button:

23 17.0

20.0
Circuit 15

Ignition switch: Position 2
ON
OFF

DM, Body and Accessories,
Vol. 2.1, section 7.1, >23 NS

21.0 Door switch

< 10.0 V
> 10.0 V
DM, Body and Accessories,
Vol. 1.1, section 3.4, > 23 PSE

22.0 Door switch
>15.5 V
< 15.5 V
DM, Body and Accessories,
Vol. 1.1, section 3.4, > 23 PSE

23.0 Right front ESA motor group (with memory)
fore/aft motor (M28m1)
(Hall sensor)

Right front ESA switch group (with memory) fore/aft switch (S92/2s1)

Press switch forward:

Press switch aft:

Value increases, seat moves forward.

Value decreases, seat moves backward.
23 2.0

24.0 Right front ESA motor group (with memory) rear raise/lower motor (M28m2)
(Hall sensor)

Right front ESA switch group (with memory) raise lower/switch (S92/2s2)

Press switch up:

Press switch down:

Value increases, seat rises at front.

Value decreases, seat lowers at front.
23 8.0

25.0 Right front ESA motor group (with memory), front raise/lower motor (M28m3)
(Hall sensor)

Right front door ESA switch group (with memory), fore/aft switch (S92/2s1)

Press switch up:

Press switch down:

Value increases, seat rises at front.

Value decreases, seat lowers at front.
23 5.0

26.0 Right front ESA motor group (with memory), head restraint raise/lower motor (M28m4)
(Hall sensor)

Left front door ESA switch group (with memory), raise/lower switch (S92/2s4)

Press switch up:

Press switch down:

Value increases, head restraint rises.

Value decreases,
head restraint lowers.
Wiring,
23 14.0

27.0 Right front ESA motor group (with memory), backrest fore/aft motor (M28m5)
(Hall sensor)

Right front door ESA switch group (with memory), backrest fore/aft switch (S92/2s5)

Press switch forward:

Press switch aft:

Value increases backrest moves forward.

Value decreases backrest moves backward.
Wiring,
23 11.0

28.0
Illuminate ESA switch group
(S91/2, S92/2)
(Activation)

Ignition: ON
Adjust instrument lamps to full intensity.

HHT button:
Press F2

Switch group illumination:

Wiring,
S91/2, S92/2,
Front driver-side door control module (N69/1),
Front passenger-side door control module (N69/2).

29.0 Right front seatback release microswitch (S92/3)
(Model 208 up to 6/98 only)

Left front seatback release microswitch (S91/3) or left front hibernation
microswitch (S91/1s2)
(Model 208 as of 06/98 only)

Seatback:

Unlocked:

Locked:

Seatback:
Unlocked and tilted only 20 degrees forward:

Tilted completely forward and locked:

23 19.0
Right front ESA control module (N32/2).

23 20.0
Right front ESA control module (N32/2).

30.0 Right front seat backrest inclination microswitch (S92/1)
(Model 208)

Seatback moved:

Forward:

Backward:

23 21.0
Right front ESA control module (N32/2).

31.0 Right front door ESA switch group (with memory), fore/aft switch (S92/2s1)

S92/2s1 pressed forward:

S92/2s1 pressed backward:

23 1.0

32.0 Right front door ESA switch group (with memory), front raise lower switch (S92/2s3)

S92/2s3 pressed up:

S92/2s1 pressed down:

23 4.0

33.0 Right front door ESA switch group (with memory), rear raise lower switch (S92/2s2)

S92/2s2 pressed up:

S92/2s2 pressed down:

23 7.0

34.0 Right front door ESA switch group (with memory), backrest fore/aft
switch (S92/2s5)

S92/2s5 pressed forward:

S92/2s5 pressed aft:

23 10.0

35.0 Right front door ESA switch group (with memory), head restraint
raise/lower (S92/2s4)

S92/2s4 pressed up:

S92/2s4 pressed down:

23 13.0

36.0 Right front door ESA switch group (with memory), memory button 1
switch (S92/2s6)

Button 1: Rest position

Press button:

23 17.0

37.0 Right front door ESA switch group (with memory), memory button 2
switch (S92/2s7)

Button 2: Rest position

Press button:

23 17.0

38.0 Right front door ESA switch group (with memory), memory button 3
switch (S92/2s8)

Button 3: Rest position

Press button:

23 17.0

39.0 Right front door ESA switch group (with memory), memory store
button (S92/2s9)

Green button:
Rest position

Press button:

23 17.0

1) Observe Preparation for test, see 22.