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37
TORQUE ON DEMAND (T.O.D.) SYSTEM
See Dash
Fuse Box,
page 11-1.
C-16
HOT IN ON OR START
C-4
ELEC.
IGN.
15A
DASH
FUSE
BOX
C-10
METER
GAUGE
10A
C-14
STOPLIGHT
A/T CONT
15A
T.O.D.
CON-
TROL
UNIT
Solid
State:
Do not
check
resis-
tance.
RR
1
2
3
AUTO
CHECK
BRN/
GRN
BLU/WHT
HOT IN ON OR START
HOT AT ALL TIMES
4WD
SWITCH
METER
ASSEMBLY
BRAKE
SWITCH
BLU/
WHT
GRN/
RED
Dash and
Console
Lights
6
2
15
(
S Model 15
)
26
)
21
22
23
16
17
4
I-9
I-9
H-25
BRN/RED
BRN
BRN/
YEL
BRN/
WHT
RED
GRN/YEL
BRN/
GRN
BRN/RED
BRN
BRN/
YEL
BRN/
WHT
RED
20
19
17
6
18
8
1
B-13
B-13
BLK/WHT
BLK/WHT
8
Dash and
Console
Lights
RED/
GRN
BLU/YEL
H-25
10
See Dash
Fuse Box,
page 11-3.
14
B-49
BLU/
WHT
See Dash
Fuse Box,
page 11-4.
BLU/YEL
BLU/YEL
GRN/WHT
GRN/WHT
Brake Lights,
Automatic
Transmission
Controls,
Cruise Control
B-48
15
GRN/YEL
14
Ignition
30
4WD switch
ON input
8
18
6
17
19
20
37
Brake switch
input
Front axle
engaged
input
42
Front axle
VSV’s control
23
12
32
13
45
Clutch
solenoid
control
11
Speed sensors input/output
Indicator control
PNK
BLU/
YEL
1
2
M-23
FRONT
AXLE
SWITCH
Closed
with 4WD
engaged.
FRONT
AXLE
VACUUM
SOLENOID
VALVE (C)
– GRAY
M-23
1
2
M-24
FRONT
AXLE
VACUUM
SOLENOID
VALVE (D)
– BLUE
M-24
LT GRN
YEL
(Not Used)
H-7
6
20
1
H-8
3
PNK
YEL
YEL
C-94
9
YEL
H-10
6
YEL
M-22
2
3
BLU/YEL
BLU/YEL
GRN
B-49
H-36
1
12
GRN
BLU/YEL
BLU/YEL
H-10
2
M-22
1
BLK
BLK
BLK
BLK
BLK
See Ground
Distribution
page 14-7.
CLUTCH
SOLENOID
(TRANSFER)
FRONT SPEED
SENSOR
(TRANSFER)
1
GRN
GRN
GRN
2
GRN/WHT
B-48
2
18
GRN/WHT
4
6
GRN/WHT
LT BLU
H-33
GRN/RED
B-49
12
13
GRN/RED
7
10
GRN/RED
GRY
REAR SPEED
SENSOR
(TRANSFER)
9
GRY
GRN/RED
5
BLK/
GRN
B-48
23
9
GRN/
YEL
1
GRN
8
LT BLU
B-49
11
GRN/YEL
GRN/YEL
GRN/YEL
H-36
3
H-33
10
M-27
YEL
5
H-17
Ground
Ground
Ref
Ref
(+)
Signal
(+)
Signal
I-12
I-12
4
1
3
H-25
14
6
2
18
12
22
7
LT BLU
LT BLU
C-94
20
GRN/
RED
H-24
14
SB9
BLU/WHT
SB13
Meter
As-
sembly
RED/BLU
RED/
BLU
12
B-48
BLU/
WHT
34
Ignition
OFF
ON
ILLU-
MINA-
TION
B-48
SB25
B-49
B-48
GRN/WHT
19
GRN
SB15
Circuit Schematic
37-1
TORQUE ON DEMAND (T.O.D.) SYSTEM
RED
BLK
YEL
40
Lights
ON
input
B-49
14
24
H-12
19
PNK
PNK
C-14
STOP-
LIGHT
A/T CONT
15A
GRN/
WHT
GRN/WHT
HOT AT ALL TIMES
See Dash
Fuse Box,
page 11-4.
DASH
FUSE
BOX
M-27
3
BLK/
BLU
H-17
2
BLK/PNK
H-33
7
BLK/BLU
BLK/BLU
H-7
17
BLK/BLU
BLK/BLU
H-55
9
BLK/BLU
BLK/BLU
See Ground
Distribution,
page 14-11.
BLK/BLU
E-30
11
2
LT GRN/RED
LT GRN/RED
18
1
GRN
GRN
Lighting
Switch
Details
GRN
B-49
22
Ground
22
13
BLK
8
BLK
7
BLK
BLK
P-15
9
4H switch
input
31
2
GRY/RED
3
GRY/RED
4
GRY/RED
22
4L switch
input
44
H-33
15
GRY/BLU
H-17
6
GRY/BLU
M-27
12
GRY/BLU
4H/L
TRANSFER
SWITCH
ASSEMBLY
B-48 4
Ground
4
BLK/BLU
Anti-lock Brake
System (ABS)
Lighting
Switch
Details
11
15
TP sensor
input
15
H-12
6
RED/WHT
H-57
16
ORN/BLK
7
ORN/BLK
16
H-8
11
ORN/BLK
ORN/BLK
Anti-lock
Brake System
(ABS)
8
WHT
7
5
WHT
C-63
16
GRN/
WHT
H-7
9
T.O.D. CONTROL UNIT
Solid State:
Do not check resistance.
DLC
input/output
5
C-63
4
DATA LINK
CONNECTOR (DLC)
16
29
BLK
BLK/BLU
B-48
C-16
See Ground
Distribution,
page 14-7.
1
2
3
BLK/BLU
4
4H
4L
33
“ABS
active”
input
36
4WD
engaged
output
SB15
BLK
Ground
46
25
BLK/
BLU
Ground
47
B-49
E-21
TP Sensor
Output
ENGINE or
POWERTRAIN
CONTROL
MODULE
(ECM or PCM)
Solid State:
Do not check
resistance.
RED/WHT
RED/WHT
Circuit Schematic
37-2
TORQUE ON DEMAND (T.O.D.) SYSTEM
(Refer to Section 201 for photographs.)
Component
Photo No.
4H/L Transfer Switch Assembly
On bottom of transfer case
127
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Switch
Below I/P, on brake pedal support
74
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clutch Solenoid (Transfer)
In transfer case (see page 4B2-5 of Service Manual)
. . . .
Dash Fuse Box
Behind left dash side trim panel
55
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Link Connector (DLC)
C63 (16-BLK)
Left I/P lower cover, behind access cover
47
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine or Powertrain Control
Module (ECM or PCM)
Right side of engine compartment
60
. . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Axle Switch
Left center of front axle
17
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Axle Vacuum Solenoid
Valve (D) - Blue
Center of front axle
9
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Axle Vacuum Solenoid
Valve (C) - Gray
Center of front axle
9
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Speed Sensor
(Transfer)
On rear of transfer case
129
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Speed Sensor
(Transfer)
On rear of transfer case
129
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T.O.D. Control Unit
Below right front seat
125
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connector
C-94 (22-GRN)
Behind front console
62
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-7 (20-BRN/WHT)
Below I/P, above left dash side trim panel, on bracket
69
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
H-8 (16-WHT)
Below I/P, above left dash side trim panel, on bracket
70
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
H-10 (16-BLU)
Left front of engine compartment
27
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-12 (20-WHT)
Below I/P, above right dash side trim panel, on bracket
100
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
H-17 (9-WHT)
Underside of vehicle, beneath right front seat
50
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-24 (18-YEL)
Below I/P, above left dash side trim panel, on bracket
70
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
H-25 (22-BLU)
Below I/P, above left dash side trim panel, on bracket
71
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . .
H-33 (20-WHT)
In floor, below right front seat
110
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-36 (3-GRY/BLK)
Below right front seat
110
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-55 (16-BLU)
Right side of engine compartment
59
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-57 (16-BLK)
Right side of engine compartment
59
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I-9 (30-GRN)
On left top of meter assembly
53
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M-22 (2-BRN)
Center of front axle
17
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M-27 (12-BLK)
On top of transfer case
128
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground
C-16
Left rear corner of engine compartment, on inner fender panel
39
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
E-30
Top right rear of engine
16
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P-15
On top of transfer case, on shift lever bracket
19
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Operation
Voltage is applied with the starter switch in ON or
START, through the ELEC. IGN. fuse CB-4. The T.O.D.
control unit receives input from the front speed sensor
(transfer) and the rear speed sensor (transfer) and de-
termines if there is any variation. In the event of a varia-
tion in speeds, voltage is applied to the clutch solenoid
(transfer) to apply torque to the front wheels. While volt-
age is being applied to the clutch solenoid (transfer),
the T.O.D. control unit is providing ground to the corre-
sponding indicators in the meter assembly. The T.O.D.
control unit receives input from the throttle position sen-
sor (TPS) in order to determine acceleration and decel-
eration conditions. The T.O.D. control unit receives an
input from the ABS system, when active, to apply volt-
age to the clutch solenoid (transfer).
Component Location Index
AUTOMATIC TRANSMISSION CONTROLS
Automatic Transmission
Mode Switch
Brake Switch
Dash Fuse Box
Data Link Connector (DLC)
C63 (16-BLK)
Fuse/Relay Box
PCM Main Relay
Powertrain Control Module (PCM)
Transmission Speed Sensor
Component Location Index
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