2001 TOYOTA SEQUOIA terminal TC

DIDF8±01
C00083DLC3
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1903
2097 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. DIAGNOSIS SYSTEM
(a) Inspect the battery voltage.
Battery voltage: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
(b) Check the DLC3.
The body ECU uses ISO 9141±2 for communication. The
terminal arrangement of the DLC3 complies with SAE
J1962 and matches the ISO 9141±2 format.
Verify the conditions listed in the table below:
Symbols (Terminals No.)Terminal DescriptionConditionSpecified Condition
SIL(7) ± SG(5)Bus º+º lineDuring communicationPulse generation
SG(5) ± Body groundSignal groundAlwaysBelow 1 W
BAT(16) ± Body groundBattery positiveAlways11 to 14 V
HINT:
If the hand±held tester display shows UNABLE TO CONNECT
TO VEHICLE when the cable of the hand±held tester is con-
nected to the DLC3, the ignition switch is turned to the ON posi-
tion and the tester is operated, there is a problem on either the
vehicle side or the tester side.

If communication is normal when the tester is connected
to another vehicle, inspect the DLC3 on the original ve-
hicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tester itself, so consult the Service Department listed in
the tester's instruction manual.

DI±1906
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2100 Author: Date:
2005 SEQUOIA (RM1146U)B1242
(DI±1933)
Wireless door lock tuner circuit malfunction

Wireless door lock control receiver

Wire harness

Body ECU
B1243
(DI±1935)GSW terminal circuit malfunction

Airbag sensor assembly

Wire harness

Body ECU
B1244
(DI±1937)Light sensor circuit malfunction

Automatic light control sensor

Wire harness

Body ECU
B1262
(DI±1940)A/C ECU communication stop

A/C ECU (Integration control and panel)

Wire harness

Body ECU
B1271
(DI±1943)Combination meter ECU communication stop

Combination meter

Wire harness

Body ECU
B1272
(DI±1946)Memory seat ECU communication stop
(w/ Driving position memory)
Memory seat ECU & switch

Wire harness

Body ECU
B1273
(DI±1949)Sliding roof ECU communication stop
(w/ Sliding roof)
Sliding roof ECU

Wire harness

Body ECU
B1287
(DI±1952)Back door ECU communication stop

Back door ECU

Wire harness

Body ECU
HINT:

When either DTC B1214 or B1215 is output, a DTC for another ECU communication stop may also
be output. In this case, perform troubleshooting for DTC B1214 or B1215 first. DTC B1214 or B1215
is output when a short to +B or short to ground occurs on a communication bus.

DTCs from B1221 to B1241 do not indicate that the corresponding switch is abnormal. They notify how
the switch is operating.
If the corresponding DTC is not indicated when operating a switch, there is a problem with the switch
contact.
If a DTC is indicated when not operating switches, the corresponding switch is stuck.

I15555
Body ECU W2
Wireless Door Lock
Control Receiver
2PRG
RDA 4 5
V
R±G 3
B5 PRG
RDAB5
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1933
2127 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1242 Wireless door lock tuner circuit mal-
function
CIRCUIT DESCRIPTION
This DTC is indicated when ground short of the RDA terminal is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1242Ground short of RDA circuit

Wireless door lock control receiver

Wire harness

Body ECU
WIRING DIAGRAM
DI638±10

I26946
Airbag Sensor Assembly Body ECU
A2018
GSW16
B6GSW Instrument Panel J/B
1A7
1B3
GR±R
B
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1935
2129 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1243 GSW terminal circuit malfunction
CIRCUIT DESCRIPTION
This DTC is indicated when open or ground short of the GSW terminal is detected.
DTC No.DTC Detection ConditionTrouble Area
B1243Open or ground short of GSW circuit

Airbag sensor assembly

Wire harness

Body ECU
WIRING DIAGRAM
DI1T3±09

DID9J±01
± DIAGNOSTICSAUDIO SYSTEM
DI±1955
2149 Author: Date:
2005 SEQUOIA (RM1146U)
AUDIO SYSTEM
PRECAUTION
NOTICE:
When disconnect the battery terminal, initialize the following systems after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77

DID9K±01
I27726
Radio Receiver Assy
Rear Door Speaker Tweeter
Rear Door Speaker Front Door Speaker (*1)
Front Door Speaker and
Woofer (*2)Steering Pad
Switch
Instrument Panel J/B

RAD NO. 2 Fuse

ECU±B Fuse

AM1 FuseEngine Room J/B

RAD NO. 1 Fuse

RAD NO. 3 Fuse
Ignition Switch
Disc Player
Controller
(*3)
Stereo
Component
AmplifierMulti±display
Controller (*3)
VTR
Terminal
(*3)Headphone
Terminal
(*3, *4)
Television Display Assy (*3)
Rear Seat Audio
Controller Assy (*4)
Radio Sub
Antenna*1: Built±in Type Amplifier
*2: Separate Type Amplifier
*3: w/ RSE System
*4: w/ RSA System Radio Main Antenna
DI±1956
± DIAGNOSTICSAUDIO SYSTEM
2150 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DID9R±01
I28312
R4R19R20
± DIAGNOSTICSAUDIO SYSTEM
DI±1969
2163 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
1. RADIO RECEIVER ASSY (SEPARATE TYPE AMPLIFIER)
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecification
BU+B (R4±1) ± GND (R4±20)L±Y ± BRBatteryAlways10 to 14 V
ILL+ (R4±2) ± GND (R4±20)G ± BRIllumination (dimmer)
signalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
TX+ (R4±5) ± GND (R4±20)V ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
MUTE (R4±7) ± GND (R4±20)R±W ± BRMUTE signalAudio system is playing "changing
modeAbove 3.5 V "
Below 1 V
R+ (R4±8) ± GND (R4±20)W ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sounds is
output
L+ (R4±9) ± GND (R4±20)B ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R4±10) ± Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
ACC+B (R4±11) ±
GND (R4±20)GR ± BRAccessory (ON)Turn ignition switch to OFF "ACC10 to 14 V
ILL± (R4±12) ± GND (R4±20)W±G ± BRIllumination (rheostat)
signalLight control switch TAILBelow 1 V "
10 to 14 V
ANT+B (R4±13) ±
GND (R4±20)B±R ± BRPower source of antennaRadio switch ON and AM or FM10 to 14 V
TX± (R4±15) ± GND (R4±20)P ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
R± (R4±18) ± GND (R4±20)G ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sounds is
output
L± (R4±19) ± GND (R4±20)R ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R4±20) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
GND (R19±6) ± GND (R4±20)BR±W ± BRSteering pad switch
groundAlwaysBelow 1 V
SW1 (R19±7) ± GND (R4±20)LG±R ± BRSteering pad switch signal
Steering pad switch not operating.
"SEEK+ switch push
"SEEK± switch push
"VOL+ switch push
"VOL± switch push4 V or more
"Approx. 0.5 V
"Approx. 0.9 V
"Approx. 2.0 V
"Approx. 3.4 V
SW2 (R19±8) ± GND (R4±20)GR±R ± BRSteering pad switch signalSteering pad switch not operating
"MODE switch push4 V or more "
Below 2.5 V

I28313
R2R3R19
± DIAGNOSTICSAUDIO SYSTEM
DI±1971
2165 Author: Date:
2005 SEQUOIA (RM1146U)
*1: w/ Rear seat entertainment system
*2: w/ Rear seat audio system
2. RADIO RECEIVER ASSY (BUILT±IN TYPE AMPLIFIER)
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecification
FR+ (R2±1) ± GND (R2±7)LG ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
FL+ (R2±2) ± GND (R2±7)P ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
ACC+B (R2±3) ± GND (R2±7)GR ± BRAccessory (ON)Turn ignition switch to OFF " ACCBelow 1 V "
10 to 14 V
BU+B (R2±4) ± GND (R2±7)L±Y ± BRBatteryAlways10 to 14 V
FR± (R2±5) ± GND (R2±7)L ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
FL± (R2±6) ± GND (R2±7)V ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R2±7) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
ANT+B (R2±8) ± GND (R2±7)B±R ± BRPower source of antennaRadio switch ON and AM or FM10 to 14 V
ILL+ (R2±10) ± GND (R2±7)G ± BRIllumination (rheostat) sig-
nalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
RR+ (R3±1) ± GND (R2±7)R ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
RL+ (R3±2) ± GND (R2±7)B ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
RR± (R3±3) ± GND (R2±7)W ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
ILL± (R3±5) ± GND (R2±7)W±G ± BRIllumination (rheostat) sig-
nalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
RL± (R3±6) ± GND (R2±7)Y ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R19±6) ± GND (R2±7)BR±W ± BRSteering pad switch
groundAlwaysBelow 1 V