2001 TOYOTA SEQUOIA Page 18

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).

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

I27699
Body ECU Wire Harness View:
B7
DCTY
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1535
1729 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check harness and connector (Body ECU ± door courtesy light switch assy).
PREPARATION:
(a) Disconnect the B7 body ECU connector.
(b) Reinstall the courtesy light switch assy.
(c) Reconnect the courtesy light switch assy connector.
CHECK:
Measure the resistance of the wire harness side connectors.
OK:
Tester Connection
(Symbol)ConditionSpecified Condition
B7±12 (DCTY) ±
Body groundCourtesy light switch
pushed " free10 kW or higher
" Below 1 W
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
DI±1508).

DIDEX±01
DI±1536
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1730 Author: Date:
2005 SEQUOIA (RM1146U)
CRUISE CONTROL SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77

DI26R±41
Customer Problem Analysis
Check and Clear DTC
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Symptom does not occur
DTC CheckNormal system code
DTC Chart
Problem Symptoms Table
Circuit InspectionInput Signal Check
Parts Inspection
Identification of Problem
Repair
Confirmation Test
EndItems 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
2
34
5
6
7
89
10
Step 2, 5, 8, 10: Diagnostic steps permitting use of
the hand±held tester. P. DI±1538
P. DI±1545
P. DI±1545
P. DI±1549
P. IN±24
P. DI±1541
P. DI±1551 ± DI±1567
OKNG
Symptom occurs
Trouble code
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1537
1731 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the following procedures:

DI26X±44
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1541
1735 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
If a normal system code is displayed during the DTC check but the problem still occurs, check the circuits
for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting
page.
HINT:
Inspect the ºFuseº and ºRelayº before confirming the suspected areas shown in the table below.
Inspect each suspected area in numerical order, in relation to the corresponding symptom.
If the malfunction still exists after checking and confirming that all the circuits are normal, replace the ECM.
SymptomSuspected AreaSee page
Main switch cannot be turned ON.
(Cruise indicator light in combination meter does not come on.)
1. Cruise control switch circuit
2. CRUISE main indicator light circuit
3. Combination meter system
4. ECMDI±1561
DI±1557
DI±1608
IN±35
Vehicle speed setting cannot be done.
(Although indicator light in combination meter comes on when
main switch is turned ON, it goes off when vehicle speed is set.)1. Cruise control switch circuit
2. ECMDI±1561
IN±35
Setting cannot be done.
(Indicator light in combination meter comes on when main switch
is turned ON and it remains ON while setting.)
1. Cruise control switch circuit
2. Vehicle speed sensor circuit (DTC P0500)
3. Stop light switch circuit (DTC P0571)
4. Park/neutral position switch circuit (DTC P0705)
5. O/D main switch circuit
6. Combination meter system
7. ECMDI±1561
DI±278
DI±1552
DI±576
DI±688
DI±1610
IN±35
While vehicle is driven with cruise control, set control is cancelled.
(Indicator light and CRUISE remain ON.)
1. Cruise control switch circuit
2. Vehicle speed sensor circuit (DTC P0500)
3. Stop light switch circuit (DTC P0571)
4. CRUISE main indicator light circuit
5. Park/neutral position switch circuit (DTC P0705)
6. Combination meter system
7. ECMDI±1561
DI±278
DI±1552
DI±1557
DI±576
DI±1608
IN±35
Hunting
(Speed is not constant.)1. Vehicle speed sensor circuit (DTC P0500)
2. ECMDI±278
IN±35
Setting cannot be cancelled.
(When coast, acceleration, resume, or set speed change function
is operated with control switch.)1. Cruise control switch circuit
2. ECMDI±1561
IN±35
DTC is not output, or is output when it should not be.1. Diagnosis circuitDI±1567
CRUISE main indicator light does not come on.
1. Cruise control switch circuit
2. CRUISE main indicator light circuit
3. Combination meter system
4. ECMDI±1561
DI±1557
DI±1610
IN±35

DI3CH±22
I28458
E8E7 E6 E5 E4
DI±1542
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1736 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
TC (E4±23) ± E1 (E6±1)P±B ± BRDTC output signalIgnition switch on10 to 14 V
TC (E4±23) ± E1 (E6±1)P±B ± BRDTC output signalIgnition switch on, connect terminals
TC and CG of DLC3Below 1 V
ST1± (E4±16) ± E1 (E6±1)L±B ± BRCruise cancel input signalIgnition switch on, depress brake
pedalBelow 1 V
ST1± (E4±16) ± E1 (E6±1)L±B ± BRCruise cancel input signalIgnition switch on, release brake
pedal10 to 14 V
STP (E4±15) ± E1 (E6±1)G±Y ± BRStop light switch input sig-
nalIgnition switch on, depress brake
pedal10 to 14 V
STP (E4±15) ± E1 (E6±1)G±Y ± BRStop light switch input sig-
nalIgnition switch on, release brake
pedalBelow 1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on10 to 14 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, CANCEL switch
held ON6.6 to 10.1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, +/RES switch
held ON4.5 to 7.1 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, ±/SET switch
held ON2.3 to 4.0 V
CCS (E5±2) ± E1 (E6±1)R±Y ± BRCruise control main
switch input circuitIgnition switch on, MAIN switch held
ONBelow 1 V
SPD (E5±8) ±E1 (E6±1)G±O ± BRSpeed signalIgnition switch on, rotate driving
wheel slowlyPulse generation
(see page DI±278)
D (E5±21) ±E1 (E6±1)W±R ± BRD shift position switch in-
put signalIgnition switch on, shift lever D posi-
tion10 to 14 V
D (E5±21) ±E1 (E6±1)W±R ± BRD shift position switch in-
put signalIgnition switch on, shift lever any
position except DBelow 1 V
PI (E5±18) ±E1 (E6±1)LG±R ± BRCruise indication signalIgnition switch on, MAIN switch
OFF10 to 14 V
PI (E5±18) ±E1 (E6±1)LG±R ± BRCruise indication signalIgnition switch on, MAIN switch onBelow 1 V

I11929
CRUISE Main
Indicator Light
BE4034
Indicator Light
1.5 secs.0.5 secs.
ON
OFF DI±1544
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1738 Author: Date:
2005 SEQUOIA (RM1146U)
3. CHECK THE INDICATOR
(a) Turn the ignition switch to the ON position.
(b) Check that the CRUISE main indicator light comes on
when the cruise control main switch ON±OFF button is
pushed on, and that the indicator light goes off when the
ON±OFF button is pushed off.
HINT:
If there is a problem with the indicator, inspect the cruise main
indicator light circuit (see page DI±1557).
HINT:
If a malfunction occurs in the vehicle speed sensors, stop lamp
switch assy, or other related parts during cruise control driving,
the ECM will actuate AUTO CANCEL of the cruise control. The
CRUISE main indicator light will then start to blink, informing the
driver of the malfunction. At the same time, data concerning the
malfunction is stored as a diagnostic trouble code (DTC).