Great Wall service chassis and body Manual — part 69
BE-5
If there is diode in the circuit, connect the two leads in reverse
polar and make another inspection. When the cathode lead (-)
is connected with the positive (+) side of diode, and the
positive (+) lead should be connected with the cathode (-) lead
of diode, the diode should conduct, while the two leads
connected to the reverse polar, the diode should not contact.
Remark: the specification may be not same due to different
testing meter types; therefore, the application instruction for
testing meter should be referred before the inspection.
Check the light emitting diode (LED) according to the same
approach for diode inspection.
Remark:
The testing meter should be used the one with 3V voltage or the
one has larger resistance than that in circuit.
If no suitable testing meter is applied, the voltage of accumu-
lator may be added to check the LED to see whether it is
lighted.
(c)
Use the voltage or ohmn meter with high-impedance
(min voltage of 10 KV) to diagnose the failure in electric
circuit.
Body Electric System
Brief Introduction
0
0
K
K
ohmn meter
diode
0
0
K
K
ohmn
LED
digital type
analogue type
DC
D
C
V
LG terminal of ignition switch
testing bubble
fuse box
short circuit
SW1
short circuit
disconnection
electromagnetic
coil
short circuit
disconnection
disconnectiong
Check to see whether there is short circuit
(a)
Tear down the burned fuse and remove all loads from
the fuse.
(b)
Connect the testing bubble at the fuse position;
(c)
Verify the situation of testing bubble position:
For example:
Put the ignition switch of SW atON position;
Put the ignition switch of SW and SW1 atON position;
Put the ignition switch of SW, SW1 and Relay at
ON position (which connects with the relay), and put
SW2 at
OFF) position (or disconnect the SW2).
(d)
Disconnect or re-connect the plugging elements when
observing the testing bubble. In case the testing bubble
keeps lighting, which shows there is short circuit between
the plugging elements; if the testing bubble extinguishes,
there is short circuit between the plugging elements.
(e)
Shake the trouble wire alongside the body to locate the
SW2
electromagnetic
coil
BE-6
Position and content of protective box
Parts mounting Position
Body Electric System
Protective Box Position and Content
time-delay relay
protective box I
protective box III
horn relay
SL diesel
SY diesel
pre-heating timer
SL diesel
SY diesel
flasher relay
protective box I
rear defrost relay SY
rear air-conditioning relay SY
SL SK SY SJ
Dr SF
BE-7
Body Electric System
Protective Box Position and Content
protective box II
preheating relay
diesel
air-conditioner relay
fuel pump relay
ECU relay
Parts Mounting Position (Continued)
BE-8
Body Electric System
Protective Box Position and Content
Content of Protective Box
1 protective box I
fuse
1.Small lamp
10A
2.Rain brus
20A
3.Ceiling lamp
10A
4.(Cigarette lighter)
15A
5.Back -u
15A
6.Brake
10A
7.electric window
30A
8.Instrument
10A
fuel delivery/break electromagnetic valve10A(diesel
9.Central control lock
15A
Dr
A
B
C
1
2
3
4
5
6
7
8
9
SL SK
U
N
O
V
P
Q
R
NM
NN
NO
S
T
NP
NQ
FUSE
1. Protection
10A
2. Unload
3. Charging
10A
4. Back-up
10A
5. ECU
10A
6. Unload
7. Rain wiper
10A
8. Stop lamp
10A
9. Ceiling lamp
10A
10. Central control lock 15A
11. Dual flasher
10A
12. EC
10A
13. Fuel pump
10A
14. Cigarette lighter
15A
relay
A electric window relay
B. small lamp relay
C.(flasher)
(plugging elements of ceiling
lamp wire harness)
(plugging elements of wire
harness in engine room)
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