Power source circuit (Body ECU)

DI−998
DIAGNOSTICS
−
BODY CONTROL SYSTEM
DIAY3−01
Power source circuit (Body ECU)
CIRCUIT DESCRIPTION
This circuit supplies power to operate the Body ECU.
WIRING DIAGRAM
LAND CRUISER (W/G) SUP (RM970E)
DI−999
−
DIAGNOSTICS
BODY CONTROL SYSTEM
LHD Models:
Cowl Side J/B LH
Cowl Side J/B RH
ECU−B2
25
3B
L−O
1
3C
52
3Q
B−G
SB (*1)
SB (*1)
71
3Q
1
ACC CUT Relay
2
1
SB
BECU
51
3Q
50
3Q
4
3
22
2Q
Body ECU
Engine Control System
DOOR
B−R (*3)
ACC Relay
5
3
40
2E
2
ACC
L−B
B−R
5
3
2
1
ECU−IG1
AM1
39
2E
ACC
J/B No. 6
4
6B
5
6B
10
SIG
1
2C
IF
Ignition Switch
4
B (*1) 3
6D
IV1
3 B (*2)
2
IV1
6D
B (*1)
24
BDR1
1
IG1 Relay
37
2E
12
IG1
B (*1) ACC
2
AM1
Fusible Link Block
24
1B
Engine Room J/B
Short Pin
BAT
1
2
1
1C
B−G
1
F38
J/B No.2
1
F38
J/B No.3
2
J15
MAIN
140 ALT
16
Battery
*1: 2UZ−FE A/T
*2: 2UZ−FE M/T
*3: 2UZ−FE
GND2
(LH)
IG
I26290
LAND CRUISER (W/G) SUP (RM970E)
DI−1000
−
DIAGNOSTICS
BODY CONTROL SYSTEM
RHD Models:
Cowl Side J/B RH
Cowl Side J/B RH
ACC CUT Relay
1
2
1
3C
B−G
52
3Q
SB (*1)
3
51
3Q
Engine
Control
System
50
3Q
4
V
37
3E
18
3Q
Body ECU
BDR1
ACC
SB
SB (*1)
Cowl Side J/B LH
DOOR
ACC Relay
3
5
B−R (*3)
40
2E
2
ACC
5
2G
2
2Q
1
B (*4)
B−R
AM1
39
2E
1
B−G
2C
IF
Ignition Switch
4
B (*1) 3
6D
IV1
2
3 B (*2)
IV1
6D
B (*1)
J/B No.6
4
6B
5
6C
2
3
B (*3) ACC
AM1
Fusible Link Block
1
F38
J/B No.2
1
F39
J/B No.3
ALT
16 GND2
(RH)
Battery
*1: 2UZ−FE A/T
*2: 2UZ−FE M/T
*3: 2UZ−FE
*4: Except *3
IH
I26284
LAND CRUISER (W/G) SUP (RM970E)
DI−1001
DIAGNOSTICS
−
BODY CONTROL SYSTEM
RHD Models:
Body ECU
Cowl Side J/B RH
1
3C
B−G
39
3Q
39
2E
B−R
IG1 No. 3 Relay
3
5
10
SIG
1
2
AM1
1
2C
Cowl Side J/B LH
II
Ignition Switch
Cowl Side J/B LH
77
SB
2Q
37
2E
2
4
L−B
IG1
AM1
B−G
Fusible Link Block
1
F38
J/B No.2
1
F39
J/B No.3
ALT
16 GND2
(RH)
Battery
IH
I26289
LAND CRUISER (W/G) SUP (RM970E)
DI−1002
DIAGNOSTICS
−
BODY CONTROL SYSTEM
INSPECTION PROCEDURE
1
Check ECU−B2, DOOR fuse.
CHECK:
Check continuity of ECU−B2, DOOR fuse.
OK:
Continuity
NG
Replace faulty fuse.
OK
2
Check voltage between terminals BDR1, BECU and GND1, 2 of Body ECU connector.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the Body ECU connector.
CHECK:
Measure the voltage between terminals BDR1, BECU and GND1, 2.
OK:
Voltage: 10 − 14V
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page DI−992).
NG
3
Check wire harness and connector between Body ECU and body ground (See
page IN−38).
NG
OK
Proceed to next circuit inspection shown on
problem symptoms table
(See page DI−992).
LAND CRUISER (W/G) SUP (RM970E)
Repair or replace wire harness or connector.

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