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Technical Product Manual
Fault analysis and repairs 1318
7 Wiring diagrams, fault analysis
TU00-1318-0200302 © Siemens VDO Trading GmbH Section 7 7–7
Section 7: Wiring diagrams, fault analysis • Edition 12/2005
Error Component 1 Component 2
Component 1 voltage check Troubleshooting Resistance check Component 2 Troubleshooting
Measurin
g point
colour
Conductor
no. ()
12 V unit 24 V unit
Component 1 Visual check Component 1 Component 2
v = 0 km/h v = 60 km/h v = 0 km/h v = 60 km/h
Clockwork
mechanism
defective
M / M1
v board
K
Clockwork
mechanism
Flat cable
23 +
24 +
(4) ((8))
(5) ((10))
1.5 V ...>9.5 V
imp
1.5 V ...>9.5 V
imp
Connect measuring device between the two coil connections, (MP1, MP2 or 23, 24).
Measuring value: 1.5...2 kΩ (4) (5) or ((8)) ((!0))
Faulty measuring value.
Replace clockwork mechanism or flat cable.
Illumination
defective
M / M1
v board
Check lamp holder and contact.
H 1
Illumination
Flat cable
25 +
22 -
(6) ((12))
(3) ((6))
12 V 24 V
(on lamp holder)
24 V unit: 25 Ω (fitted) 52 Ω (removed)
12 V unit: 10 Ω (fitted) 12 Ω (removed)
Faulty measuring value
Replace lamp.
Measuring value correct, replace flat cable.
H2 warning LED
defective
M / M1
v board
H
Lamp plate
Flat cable
27 + (8) ((16))
0 V 11 V 0 V 13.5 V
see component 2 troubleshooting
Faulty measuring value.
Check contact carrier or replace LED.
G
contact carrier
wtgn 19 + 0 V 11 V 0 V 23.5 V
wtgn 18 + 11 V 23.5 V
H3 warning LED
defective
M / M1
v board
H
Lamp plate
F1
F2
Flat cable
26 + (7) ((14))
Cover open 8 V
Also make a note of components A, E, F.
Contact set
Flat cable
21 -
26 +
(2) ((4))
(7) ((14))
Cover open
Cover closed
8 V
0 V
see component 2 troubleshooting
I
Cover contact
F2
Flat cable
20 + (1) ((2))
8 V
0 V
see component 2 troubleshooting
I cover contact
Lamp plate
Flat cable
I Cover contact 11 + cover open! Cover open 8 V Connect measuring device between points 10 and 11.
Tachograph chart inserted: 0 Ω
Tachograph chart not inserted: Ω
H Lamp plate
F2
10 + F2 chart not inserted
F2 chart inserted
8 V
0 V
Faulty speed display M / M1
v board
C
v DC motor
bk 10 +
r 11 +
0 V 2.7 ... 3.4V 0 V 2.7 ... 3.4V
Remove connector. Measuring value between wires r and bk: 50 Ω (+ 12 %)
From 05.97 30 Ω
Faulty measuring value.
Replace DC motor.
B
Potentiometer
Speed
p 7 + 2.3 V Remove connector. Measuring value between wires p and wt: about 200 Ω - 5 kΩ
The resistance value must increase or decrease steadily when turning the pointer
coupling slowly.
Faulty measuring value
Replace frame and integral unit.
wtr 8 + 5 V 4.3 V 5.7 V 4.3 V
wt 9 + 5.7 V
D
I/O socket see component 2
Remove connector. Plug jack plug into test socket.
Measuring value between pink wire and jack plug front part 0 Ω.
Measuring value between white wire and jack plug back part Ω.
L
Coding switch
see component 2
Measuring device negative pole at point 28. Measuring value between points 29 and 38
if switch set to "ON": 0 Ω. Measuring value if switch set to "OFF": > 0.5 kΩ.
Faulty distance
recording
Faulty WT
recording
H3 warning LED
flashes
M / M1
v board
A
WT motor
Knobs set to
ye 3 +
br 2 +
br 5 +
ye 4 +
11.2 V 6 V 23 V 12.2 V
Remove connector.
Measuring value between points 1 and 2 or 3 and measuring value between points 6 and
4 or 5:
150 Ω or 180 Ω (with 12 V units and STB; not
µP)
700 Ω (with 24 V units)
Lug missing / loose
gn (bl) 1 +
gn (bl) 6 +
11.2 V (bl) 23.3 V (gn)
Voltage control
function
defective
M / M1
v board
E
Contact set
gn 14 +
gn 15 +
Cover open 8 V Remove connector. Connect measuring device between points 14 and 15 (gn wire).
Measuring value with cover closed:
: Ω / 0 Ω
Faulty measuring value.
Adjust or replace contact set.
gn 14 + Cover closed 0.2 V
F
Carriage contact
gr 16 +
gr 17 +
0 km/h
8 V
0 km/h
8 V
see component 2 troubleshooting
Faulty measuring value.
Adjust or replace carriage contact.
Measuring value correct, replace v board.
gr 16 + 0 V (v max.) 0 V (v max.)
Apply a 0 V potential to A6 tab connector for the measuring device.
+ = Connect measuring device's positive cable. Measuring tolerance: ± 10 %
Measuring device: Multimeter –accuracy class 1.5 (>30.000 Ω /V)
= horizontal = vertical
= Visually check mechanical parts. = If defective, replace component 1 part. = Cover closed and tachograph charts missing
=
Visually check electrical cables, components, soldered connections,
conductors and plug contacts.
= Check ohmic resistance. = Cables may be interchanged.
=
Check gear engagement and that the gears from the DC motor to the
potentiometer are running freely.
= If defective, replace component 2 part. ( ) = 8 pin flat cable
= If defective, check or adjust the relevant component. = Tachograph chart(s) inserted (( )) = 16 pin flat cable
8
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