2001 TOYOTA SEQUOIA ECU

DID8U±01
DI±1614
± DIAGNOSTICSCOMBINATION METER SYSTEM
1808 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:
Inspect the related ºFuseº and ºRelayº before confirming the suspected area as shown in the table below.
MALFUNCTION SYSTEM:
SymptomSuspected AreaSee page
Entire combination meter does not operate.Refer to troubleshooting proceduresDI±1628
Operating light control rheostat does not change light brightness.Refer to troubleshooting proceduresDI±1645
Seat belt warning does not operate.Refer to troubleshooting proceduresDI±1650
Key reminder warning buzzer does not sound.
1. Multiplex communication system
2. Key unlock warning switch circuit
3. Door courtesy lamp switch circuit
4. Combination meter assyDI±1892
DI±1715
DI±1728
IN±35
METER GAUGES:
SymptomSuspected AreaSee page
Malfunction in speedometerRefer to troubleshooting proceduresDI±1632
Malfunction in tachometerRefer to troubleshooting proceduresDI±1636
Malfunction in fuel receiver gaugeRefer to troubleshooting proceduresDI±1640
Malfunction in engine coolant temperature receiver gaugeRefer to troubleshooting proceduresDI±1644
Malfunction in oil pressure receiver gaugeRefer to troubleshooting proceduresDI±1654
Malfunction in volt meterRefer to troubleshooting proceduresDI±1658
WARNING LIGHTS:
SymptomSuspected AreaSee page
Check engine warning light (MIL) does not come on.
1. ECM
2. Wire harness or connector
3. Combination meter assyDI±9
±
IN±35
Discharge warning light does not come on.
1. ECM
2. Wire harness or connector
3. Combination meter assyDI±9
±
IN±35
Brake warning light does not come on.
1. Skid control ECU
2. Wire harness or connector
3. Combination meter assyDI±895
±
IN±35
ABS warning light does not come on.
1. Skid control ECU
2. Wire harness or connector
3. Combination meter assyDI±895
±
IN±35
SRS warning light does not come on.
1. Airbag sensor assy
2. Wire harness or connector
3. Combination meter assyDI±1126
±
IN±35
Open door warning light does not come on.
1. Door courtesy light switch circuit
2. Wire harness or connector
3. Combination meter assy
4. Body ECUDI±1728
±
IN±35
IN±35
Fuel level warning light does not come on.
1. Refer to troubleshooting
2. Wire harness or connector
3. Combination meter assyDI±1640
±
IN±35
Low oil pressure warning light does not come on.
1. Low oil pressure warning switch
2. Wire harness or connector
3. Combination meter assyBE±55
±
IN±35

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1615
1809 Author: Date:
2005 SEQUOIA (RM1146U) Seat belt warning lamp for driver's seat does not operate.
Refer to troubleshooting proceduresDI±1650
SLIP warning light does not come on.
1. SLIP warning light circuit
2. Wire harness and connector
3. Combination meter assy
4. Skid control ECUDI±1041
±
IN±35
IN±35
INDICATOR LIGHTS:
SymptomSuspected AreaSee page
Turn indicator light does not come on.
1. Turn signal flasher relay
2. Wire harness or connector
3. Combination meter assyBE±36
±
IN±35
High beam indicator light does not come on.
1. Headlight dimmer switch (*1)
Headlight dimmer switch circuit (*2)
2. Wire harness or connector
3. Combination meter assyBE±27
DI±1755
±
IN±35
Washer level indicator light does not come on.
1. Washer level warning switch
2. Wire harness or connector
3. Combination meter assyBE±49
±
IN±35
Tire pressure indicator light does not come on.
1. Tire pressure monitor ECU
2. Wire harness or connector
3. Combination meter assyDI±873
±
IN±35
CRUISE main indicator light does not come on.
1. CRUISE main indicator light circuit
2. Cruise main control switch circuit
3. Wire harness or connector
4. Combination meter assyDI±1557
DI±1561
±
IN±35
VSC OFF indicator light does not come on.1. VSC OFF indicator light circuit
2. Combination meter assyDI±1048
IN±35
VSC TRAC indicator light does not come on.1. VSC TRAC indicator light circuit
2. Combination meter assyDI±1027
IN±35
Security indicator light does not come on.1. Security indicator light circuit
2. Combination meter assyDI±1731
IN±35
4HI indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
4LO indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
CTR DIF LOCK indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
Height control indicator lamp does not come on.1. Height control indicator lamp circuit
2. Combination meter assyDI±785
IN±35
Height control manual indicator lamp does not come on.1. Height control manual indicator lamp circuit
2. Combination meter assyDI±789
IN±35
A/T indicator light does not come on.
1. Park/neutral position switch circuit
2. Wire harness and connector
3. Combination meter assyDI±576
±
IN±35
*1: w/o Day time running light
*2: w/ Day time running light
OTHERS:
SymptomSuspected AreaSee page
All buzzers (key reminder, seat belt) do not operate.Combination meter assyIN±35

DID8V±01
I27709
C5C6
DI±1616
± DIAGNOSTICSCOMBINATION METER SYSTEM
1810 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
COMBINATION METER ASSY
(a) Disconnect the C5 and C6 connectors.
(b) Measure the resistance of each terminal of the wire harness side connector.
Standard:
Terminals No.Wiring ColorTerminal DescriptionConditionSpecified Condition
C5±5 ± Body groundL±W ± Body
groundCompass and garage
door openerAlwaysBelow 1 W
C5±6 ± Body groundL±R ± Body
groundCompass and garage
door opener communica-
tion line
AlwaysBelow 1 W
C5±30 (*2) ± Body groundW ± Body groundMultiplex communication
signalAlwaysBelow 1 W
C5±31 ± Body groundLG±R ± Body
groundMultiplex communication
signalAlwaysBelow 1 W
C5±32 ± Body groundLG±B ± Body
groundMultiplex communication
signalAlwaysBelow 1 W

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1617
1811 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Reconnect the C5 and C6 connectors.
(d) Measure the voltage of each terminal of the wire harness side connector.
Standard:
Terminals No.Wiring ColorTerminal DescriptionConditionSpecified Condition
C5±1 ± Body groundR±B ± Body
groundParking brake signalParking brake warning light ON6.7 to 12 V
C5±1 ± Body groundR±B ± Body
groundParking brake signalParking brake warning light OFFBelow 1 V
C5±2 ± Body groundLG±R ± Body
groundCRUISE signalCRUISE indicator light ONBelow 1 V
C5±2 ± Body groundLG±R ± Body
groundCRUISE signalCRUISE indicator light OFF10 to 14 V
C5±3 ± Body groundB ± Body groundIgnition switch signal
(Start)Ignition switch OFFBelow 1 V
C5±3 ± Body groundB ± Body groundIgnition switch signal
(Start)Ignition switch START10 to 14 V
C5±4 ± Body groundG±Y ± Body
groundSeat belt condition signal
(Driver side)D±BELT indicator light ONBelow 1 V
C5±4 ± Body groundG±Y ± Body
groundSeat belt condition signal
(Driver side)D±BELT indicator light OFF10 to 14 V
C5±13 ± Body groundLG±R ± Body
groundWasher level signalWASH LVL indicator light ONBelow 1 V
C5±13 ± Body groundLG±R ± Body
groundWasher level signalWASH LVL indicator light OFF10 to 14 V
C5±14 ± Body groundL±O ± Body
groundO/D OFF indicator signalO/D OFF indicator light ONBelow 1 V
C5±14 ± Body groundL±O ± Body
groundO/D OFF indicator signalO/D OFF indicator light OFF10 to 14 V
C5±15 (*1) ± Body groundY±R ± Body
groundA/T oil temperature signalA/T OIL TEMP. warning light ONBelow 1 V
C5±15 (*1) ± Body groundY±R ± Body
groundA/T oil temperature signalA/T OIL TEMP. warning light OFF10 to 14 V
C5±16 ± Body groundLG±B ± Body
groundSecurity indicator light
signal (Engine immobilizer
system)
Security indicator light ON10 to 14 V
C5±16 ± Body groundLG±B ± Body
groundSecurity indicator light
signal (Engine immobilizer
system)
Security indicator light OFFBelow 1 V
C5±17 ± Body groundGR ± Body
groundSecurity indicator light
signal (Theft deterrent
system)
Security indicator light ON10 to 14 V
C5±17 ± Body groundGR ± Body
groundSecurity indicator light
signal (Theft deterrent
system)
Security indicator light OFFBelow 1 V
C5±18 ± Body groundV±W ± Body
groundCHECK ENGINE signalCHECK ENGINE warning light ONBelow 1 V
C5±18 ± Body groundV±W ± Body
groundCHECK ENGINE signalCHECK ENGINE warning light OFF10 to 14 V
C5±19 ± Body groundG±B ± Body
groundA/T shift position signal
(L)A/T L indicator OFFBelow 1 V

I27707
C6±21
C6±8
(*4) C5±15
C5±18
C5±2
C5±14
C5±19
C5±13
C6±1
C6±2
C6±3
C5±20ABS
CHARGE
A/T OIL TEMP
CHECK E/G
4LO O/D OFF
A/T L
WASHER
SLIP
VSC OFF
VSC TRAC
4HI CRUISE
ONE STEP
DIMMERC6±24
C6±5
C6±6
C6±4
C5±40TIRE PRS
CTR DIFF LOCK
RSCA OFF
SECURITY
P
R
NC5±16
C5±17
C5±34
C5±35
C5±36
C5±37
C5±38
C5±39
C6±17 (*5)
C6±18 (*6)
C5±33
C6±19 TURN (L) TURN (R) BEAM3
2 D
*4: 4WD *5: w/o Daytime Running Light *6: w/ Daytime Running LightONE STEP
DIMMERRSCA OFF
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1623
1817 Author: Date:
2005 SEQUOIA (RM1146U)

Wire harness side
1
2
3
4
5
6
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
401
2
3
4
5
8 6
10
11
12
13
14
15
16
17
18
19
21
23
24
Terminal No.
Translate ECU
ECM
STA Fuse
Front Seat Inner Belt LH (Buckle Switch)
Overhead Module (Garage Door Opener)
Overhead Module (Garage Door Opener)
Washer Level Sensor
ECM
ECM (*1)
Transponder Key Computer
Body ECU
ECM
ECM
Tire Pressure Monitor ECU
Injector No. 1
Light Control Rheostat
ECM
Speed Sensor
4P OUT (Other Parts)
Fuel Sender Gauge
Oil Pressure Sender Gauge
IGN Fuse
Airbag Sensor Assembly
Memory Seat ECU and SW (*2)
Back Door ECU
Integration Control and Panel
Turn Signal Flasher Relay
Park/Neutral Position Switch
Airbag Sensor AssemblyTranslate ECU
Translate ECU
Skid Control ECU
4WD Control ECU
Alternator
Speed Sensor
Fuel Sender Gauge
Ground
Suspension Control ECU
Body ECU (*4)
Body ECU (*3)
Turn Signal Flasher Relay
Skid Control ECU
ECU±B Fuse
IGN1 Fuse Connectors:
Terminal No.
Wire harness side
C5
C64WD Control ECU
4WD Control ECU
Suspension Control ECU
Suspension Control ECU
Suspension Control ECU
*1: 4WD
*2: w/ Driving Position Memory
*3: w/ Daytime Running Light
*4: w/o Daytime Running LightPark/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch DI±1624
± DIAGNOSTICSCOMBINATION METER SYSTEM
1818 Author: Date:
2005 SEQUOIA (RM1146U)

DID8W±01
C00083DLC3
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1625
1819 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
INSPECT THE DLC3
The vehicle's combination meter ECU uses ISO 9141±2 for
communication. The terminal arrangement of the DLC3 com-
plies with SAE J1962 and matches the ISO 9141±2 format.
Tester connectionConditionSpecified condition
7 (Bus
Line) ± 5 (Signal ground)During communicationPulse generation
4 (Chassis Ground) ± BodyAlwaysBelow 1 W
5 (Signal Ground) ± BodyAlwaysBelow 1 W
16 (B+) ± BodyAlways10 to 14 V
HINT:
If the display shows UNABLE TO CONNECT TO VEHICLE
when you have connected the cable of the hand±held tester to
the DLC3, turned the ignition switch to the ON position and op-
erated the tester, there is a problem either on the vehicle side
or tester side.

If communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.

If communication is still impossible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.

I28557
I18
Ignition SWInstrument Panel J/BCombination Meter
Engine Room J/B
Sub J/B No. 4
IEBattery J8
J/CIA5 F10
Fusible
Link BlockC6
C5 C6
C6
C5 1F
1J
1C1D
1H
1C
1C1D
1D
1J
1J
2C 2D
222C
4B 4A AM2IG2
ST2
(*1) (*2)
W±B
W±R
B±R
B±WBR
B±O W±R
B±R
W±R W±RB±R
B±R B
AB
B
BB 893
98
2
1 1
1 4
5Short Pin
ECU±B
AM2
STA 4 5
8 211 9
37 6
53 396
IGN1
IGN212
23
24
28
Engine Room R/B
*1: Head (USA)
*2: Tail (CANADA)
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1629
1823 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM