2001 TOYOTA SEQUOIA ECU

DI±1630
± DIAGNOSTICSCOMBINATION METER SYSTEM
1824 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check fuse.
CHECK:
Measure the resistance of the IGN2 fuse and IGN1 fuse in the instrument panel J/B.
OK:
Below 1 W
CHECK:
Measure the resistance of the STA fuse in the engine room R/B.
OK:
Below 1 W
CHECK:
Measure the resistance of the ECU±B fuse and AM2 fuse in the engine room R/B.
OK:
Below 1 W
NG Inspect for short circuit in harness and all com-
ponents connected to fuse.
OK

I28559
E5 C5 ECU
TACHCombination Meter
23 J/C
J14D
J15F
Y±G Y±G 1 DI±1636
± DIAGNOSTICSCOMBINATION METER SYSTEM
1830 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in tachometer
CIRCUIT DESCRIPTION
The indication on the tachometer is based on information that the ECM receives from the crankshaft position
sensor.
WIRING DIAGRAM
DID90±01

DI±1644
± DIAGNOSTICSCOMBINATION METER SYSTEM
1838 Author: Date:
2005 SEQUOIA (RM1146U)
Malfunction in engine coolant temperature receiver gauge
CIRCUIT DESCRIPTION
The ECM receives an engine coolant temperature signal from the engine coolant temperature sensor and
sends it to the A/C ECU.
The combination meter receives the signal from the A/C ECU through multiplex communication. Therefore,
if a malfunction occurs in the engine coolant temperature receiver gauge, there may be a malfunction in the
multiplex communication system, air conditioning system, or engine system.
(Multiplex communication system: See page DI±1892)
(Air conditioning system: See page DI±2301)
(Engine system: See page DI±9)
INSPECTION PROCEDURE
1 Perform active test by hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON, and push the hand±held tester main switch ON.
CHECK:
From the display on the tester, perform the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
COOLANT TEMPHIGH / NORMAL / LOW (OFF)Confirm that the vehicle is stopped and engine is
idling.
OK:
Engine coolant temperature receiver gauge readings change according to hand±held tester op-
eration.
OK Go to engine system or air conditioning system
(See page DI±9 or DI±2301).
NG
Replace combination meter
(See page IN±35).
DID92±01

I28561
R6
Rheostat
To Each
Illumination Parts
To Each
Illumination Parts
Instrument Panel J/B
Combination Meter
I18
Ignition SW J8
J/C
Sub J/B No. 3
F10
Fusible Link Block
Engine Room J/B
Battery
IET
ILL±
E
TR
IG C5
C612 22
24
C6
Illumination 1F
1J 1C1D 1H
1C
1C8
2
11 9
34 13
6
IGN1
AM11H 1E
1C4
1 1F
1L 6
7 56
12
2DECU±IG
2188
3A 3E
8
4
51 3 4
5 6
ALT
AM2 IG2
AM2 11
2C A
A
AM1 IG1
G
W±G
W±B
BR W±G
W±G
W±BW±G
B±R
B±YB±O
B±R
W
W±L
W±RB±R
BW±RB DI±1646
± DIAGNOSTICSCOMBINATION METER SYSTEM
1840 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI272±11
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Symptom does not occur
Problem Symptom Table
Circuit Inspection
Identification of Problem
Repair
Confirmation Test
EndTitles inside
are titles of pages in this
manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations. 1
23
5
6
8Step 6, 8 : Diagnostic steps permitting the use
of the hand±held tester. P. DI±1663
P. DI±1664
P. IN±24
P. DI±1668 ± DI±1675
Symptom occurs
7
Multiplex Communication System Inspection * 4
P. DI±1904
*: Confirm that there is no trouble by DTC check. DI±1662
± DIAGNOSTICSSLIDING ROOF SYSTEM
1856 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
The ECU of this system is connected to the multiplex communication system. Therefore, before starting trou-
bleshooting, make sure to check that there is no trouble in the multiplex communication system.

DI276±09
DI±1664
± DIAGNOSTICSSLIDING ROOF SYSTEM
1858 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Sliding roof control system does not operate.
1. SUN ROOF Fuse
2. ECU±IG Fuse
3. Power Source Circuit
4. Sliding Roof Control Switch CircuitBE±14
BE±14
DI±1668
DI±1671
Sliding roof operates abnormally or stops half way.Sliding Roof Pulse Plate CircuitDI±1675
Jam protection system does not operate.Sliding Roof Pulse Plate CircuitDI±1675

DI275±12
I04611
S19
± DIAGNOSTICSSLIDING ROOF SYSTEM
DI±1665
1859 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSpecified Condition
MPX1 e ± (S19 ± 2 e ±)G±O e ±Multiplex communication circuit±
DWN e E
(S19 ± 3 e S19 ± 7)R±W e W±BIgnition switch ON " Sliding roof control switch TILT DOWN10 to 14 V "
Below 1 V
UP e E
(S19 ± 4 e S19 ± 7)R±Y e W±BIgnition switch ON " Sliding roof control switch TILT UP10 to 14 V "
Below 1 V
B e E
(S19 ± 5 e S19 ± 7)L±W e W±BAlways10 to 14 V
E e Body ground
(S19 ± 7 e Body ground)W±B e Body
groundAlwaysBelow 1 V
IG e E
(S19 ± 8 e S19 ± 7)B±R e W±BIgnition switch ON " Ignition switch OFF or ACC10 to 14 V "
Below 1 V
OPN e E
(S19 ± 9 e S19 ± 7)P±B e W±BIgnition switch ON " Sliding roof control switch OPEN10 to 14 V "
Below 1 V
CLS e E
(S19 ± 10 e S19 ± 7)G±Y e W±BIgnition switch ON " Sliding roof control switch CLOSE10 to 14 V "
Below 1 V

DI274±08
I28411
Ignition Switch Instrument Panel J/B

ECU±IG Fuse

SUN ROOF Fuse
Sliding Roof Gear Assembly

Sliding Roof ECU

Sliding Roof Motor
Sliding Roof Control Switch
± DIAGNOSTICSSLIDING ROOF SYSTEM
DI±1667
1861 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION