Page 1729 of 4323

I28704
Wire Harness Side:
Position Control ECU & Switch Assy
Power Seat Motor Assy P14
P16P15P17
M7
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1527
1721 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (Position control ECU & switch assy ± power seat
motor assy).
PREPARATION:
Disconnect the M7 ECU and P14, P15, P16 and P17 motor con-
nectors.
CHECK:
Measure the resistance of the wire harness side connectors.
OK:
Tester ConnectionSpecified Condition
M7±2 ± P17±1Below 1 W
M7±3 ± P17±2Below 1 W
M7±4 ± P14±2Below 1 W
M7±6 ± P14±1Below 1 W
M7±7 ± P15±2Below 1 W
M7±9 ± P15±1Below 1 W
M7±8 ± P16±2Below 1 W
M7±10 ± P16±1Below 1 W
M7±2 ± Body ground10 kW or higher
M7±3 ± Body ground10 kW or higher
M7±4 ± Body ground10 kW or higher
M7±6 ± Body ground10 kW or higher
M7±7 ± Body ground10 kW or higher
M7±8 ± Body ground10 kW or higher
M7±9 ± Body ground10 kW or higher
M7±10 ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1508
).
Page 1730 of 4323
I28451
BatteryJ/C
I18
Ignition SW
1
2
AM1IG1
5W BF10
FL Block
ALT
81L 1CInstrument Panel J/B
7 J52 J51
21AM1
6
1C4
1 78 L±Y1
MPX1 M6 WW
C5 C53430 Combination MeterPosition Control
ECU & Switch
P
L±Y
L±R
L±R CCPL RB 62 P1
Park/Neutral
Position Switch
B±Y
W±LGAUGEIPOIG49 BEAN
1D DI±1528
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1722 Author: Date:
2005 SEQUOIA (RM1146U)
Park/neutral position switch circuit
CIRCUIT DESCRIPTION
The power seat memory system operates only when the ignition switch is in the ON position and the park/
neutral position is in the P (park) position.
The position control ECU & switch assy detects the P position, via multiplex communication, through the
park/neutral position switch.
WIRING DIAGRAM
DIDEC±01
Page 1731 of 4323
I27704
Combination Meter Wire Harness View:
C5±34C5
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1529
1723 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check combination meter operation.
CHECK:
Check that the ºPº indicator light in the combination meter comes on when the shift lever is moved to the
P position.
OK:
The ºPº indicator light comes on.
NG Go to combination meter system (See page
DI±1610).
OK
2 Check harness and connector (Combination meter).
PREPARATION:
Disconnect the C5 combination meter connector.
CHECK:
Measure the voltage of each terminal of the wire harness side connectors.
OK:
Tester ConnectionConditionSpecified Condition
C5±34 ± Body groundIgnition switch is in ON position and shift lever is
in P position10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI±1508).
NG
Page 1732 of 4323
I28706
Park/Neutral Position Switch Assy:
P1
RB
PL
DI±1530± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1724 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect park/neutral position switch assy.
PREPARATION:
Disconnect the P1 switch connector.
CHECK:
Measure the resistance of each terminal of the wire harness
side connectors.
OK:
Tester Connection
(Symbols)ConditionSpecified Condition
P1±2 (RB) ± P1±6 (PL)Shift lever is moved to
P positionBelow 1 W
P1±2 (RB) ± P1±6 (PL)Shift lever is moved to any
position except P10 kW or higher
NG Replace park/neutral position switch.
OK
Page 1733 of 4323
I28707
Wire Harness Side:
Park/Neutral Position Switch
P1
PL
I27704
Combination Meter Wire Harness View:
C5±34C5
I28707
Wire Harness Side:
Park/Neutral Position Switch
P1RB
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1531
1725 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector (Combination meter ± park/neutral position switch
assy).
CHECK:
Measure the resistance of each terminal of the wire harness
side connectors.
OK:
Tester Connection
(Symbols)ConditionSpecified Condition
C5±34 ± P1±6 (PL)AlwaysBelow 1 W
C5±34 ± Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
5 Check harness and connector (Park/neutral position switch assy ± battery).
CHECK:
Measure the voltage of each terminal of the wire harness side
connectors.
OK:
Tester Connection
(Symbols)ConditionSpecified Condition
P1±2 (RB) ± Body groundIgnition switch ON10 to 14 V
NG Repair or replace harness or connector.
OK
Page 1734 of 4323
DI±1532± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1726 Author: Date:
2005 SEQUOIA (RM1146U)
Proceed to next circuit inspection shown in
problem symptoms table (See page
DI±1508).
Page 1735 of 4323
I28450
MPX1 M61
12
B7
GR±R
1
D14
Door Courtesy Light
Switch Front LHGR±RBEAN
24
B5
DCTY J/C
J29
J30
NGBody ECUPosition Control
ECU & Switch
MPX2
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1533
1727 Author: Date:
2005 SEQUOIA (RM1146U)
Door courtesy switch circuit
CIRCUIT DESCRIPTION
The position control ECU & switch assy detects the open/close condition of the driver's door, via multiplex
communication, through the front door courtesy light switch.
WIRING DIAGRAM
DIDEE±01
Page 1736 of 4323
N20159
Ohmmeter Free
PushedD14
DI±1534± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
1728 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check courtesy light system.
CHECK:
Check that the door courtesy light comes on when the driver's door is opened and goes off when it is closed.
OK:
The door courtesy light operates normally.
NG Go to courtesy light system
(See page BE±40).
OK
2 Inspect door courtesy light switch front LH.
PREPARATION:
Remove the courtesy light switch assy.
CHECK:
Measure the switch resistance.
OK:
Tester ConnectionSwitch PositionSpecified Condition
1 ± Switch bodySwitch pushed10 kW or higher
1 ± Switch bodySwitch freeBelow 1 W
NG Replace door courtesy light switch front LH.
OK