2001 TOYOTA SEQUOIA warning

DI±1156
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1350 Author: Date:
2005 SEQUOIA (RM1146U)B1656/38
(DI±1220)

Seat belt buckle switch LH malfunction

Front seat inner belt LH

Airbag sensor assembly

Floor wire No. 2
ON
B1660/43
(DI±1227)
Passenger airbag ON/OFF indicator malfunction

Integration control and panel (Passenger
airbag ON/OFF indicator)

Airbag sensor assembly

Cowl wire
ON
B1661/44
(*1)
(DI±1238)

Roll over cut off indicator malfunction

Combination meter (RSCA OFF indicator)

Airbag sensor assembly

Cowl wire
ON
B1662/45
(DI±1247)
SRS warning light circuit malfunction

Combination meter (SRS warning light)

Airbag sensor assembly

Cowl wire
ON
B1800/51
(DI±1352)
Short in D squib circuit

Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Cowl wire
ON
B1801/51
(DI±1352)
Open in D squib circuit

Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Cowl wire
ON
B1802/51
(DI±1352)
Short in D squib circuit (to ground)

Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Cowl wire
ON
B1803/51
(DI±1352)
Short in D squib circuit (to B+)

Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Cowl wire
ON
B1805/52
(DI±1374)
Short in P squib circuit

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire
ON
B1806/52
(DI±1374)
Open in P squib circuit

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire
ON
B1807/52
(DI±1374)
Short in P squib circuit (to ground)

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire
ON
B1808/52
(DI±1374)
Short in P squib circuit (to B+)

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire
ON
B1810/53
(DI±1384)
Short in D squib (Dual stage ± 2nd step) circuit

Steering wheel pad (D squib, Dual stage ±
2nd step)

Spiral cable

Airbag sensor assembly

Cowl wire
ON
B1811/53
(DI±1384)
Open in D squib (Dual stage ± 2nd step) circuit

Steering wheel pad (D squib, Dual stage ±
2nd step)

Spiral cable

Airbag sensor assembly

Cowl wire
ON

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1247
1441 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1662/45 SRS Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
The SRS warning light circuit consists of the airbag sensor assembly and the combination meter.
When the airbag sensor assembly detects a malfunction in the SRS airbag system, the SRS warning light
comes on to inform the driver.
It also comes on when the power voltage drops, and automatically goes off in approximately 10 seconds
after the power voltage returns to normal (DTC is not stored).
The SRS warning light comes on for 6 seconds after the ignition switch is turned to the ON position and goes
off if the system is normal.
When an open circuit is detected, such as when the connector between the combination meter and the air-
bag sensor assembly is disconnected, the SRS warning light remains on even when approximately 6 se-
conds elapsed after the ignition switch is turned to the ON position.
DTC B1662/45 is recorded when a malfunction is detected in the SRS warning light circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1662/45

The airbag sensor assembly receives an open circuit sig-
nal or a short circuit to ground signal in the SRS warning
light circuit for 2 seconds.

SRS warning light malfunction

Airbag sensor assembly malfunction

Combination meter (SRS warning light)

Airbag sensor assembly

Cowl wire
HINT:
When DTC B1662/45 and B1000/31 are output simultaneously, perform the troubleshooting for DTC
B1662/45 first.
DIDH3±01

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1249
1443 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check battery.
CHECK:
Measure the voltage of the battery.
OK:
Voltage: 11 to 14 V
NG Replace battery.
OK
2 Check connection of connectors.
PREPARATION:
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the battery, and wait for at least 90 seconds.
CHECK:
Check that the connectors are properly connected to the airbag sensor assembly and combination meter.
OK:
The connectors are connected securely.
NG Connect connectors, then go to step 1.
OK
3 Check combination meter.
PREPARATION:
(a) Disconnect the connectors from the airbag sensor assembly.
(b) Connect the negative (±) terminal cable to the battery, and wait for at least 2 seconds.
CHECK:
Turn the ignition switch to the ON position, check the operation of the SRS warning light.
OK:
The SRS warning light comes on (goes off 6 seconds after the ignition switch is turned to the
ON position).
NG Go to combination meter system
(see page DI±1610).
OK

DI±1480
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1674 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage±increase circuit (DC±DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage±increase circuit (DC±DC converter) functions to increase the
voltage of the SRS to normal voltage.
A malfunction in this circuit is displayed differently from other codes. The source voltage drop is indicated
when the SRS warning light comes on without showing any DTCs.
A malfunction in this circuit is not recorded in the airbag sensor assembly. The SRS warning light automati-
cally goes off when the source voltage returns to normal.
DTC No.Detection Item
(Normal)Source voltage drop
DIDHS±01

DI±1484
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1678 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check SRS warning light.
PREPARATION:
(a) Connect the connectors to the airbag sensor assembly.
(b) Connect the connectors to the steering wheel pad.
(c) Connect the connectors to the front passenger airbag assembly.
(d) w/ Side and curtain shield airbag:
Connect the connectors to the side airbag assembly LH and RH.
(e) w/ Side and curtain shield airbag:
Connect the connectors to the curtain shield airbag assembly LH and RH.
(f) Connect the connectors to the front seat outer belt LH and RH.
(g) Connect the negative (±) terminal cable to the battery, and wait for at least 2 seconds.
CHECK:
(a) Turn the ignition switch to the ON position, and wait for at least 6 seconds.
(b) Operate all components of the electrical system (defogger, wiper, headlight, heater blower, etc.) and
check the SRS warning light operation.
OK:
The SRS warning light does not come on.
NG Replace airbag sensor assembly
(see page RS±82).
OK
END

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1485
1679 Author: Date:
2005 SEQUOIA (RM1146U)
Trouble in Indicator of Passenger Airbag ON/OFF Indicator
CIRCUIT DESCRIPTION
The occupant classification system detects the front passenger seat condition. It then informs a passenger
of the front passenger airbag assembly condition (activated/not activated) by the passenger airbag ON/OFF
indicator.
The table below shows the normal indication condition of the passenger airbag ON/OFF indicator and the
front passenger seat condition.
Front passenger seat conditionON IndicatorOFF Indicator
Adult is seated.ONOFF
Child is seated.OFFON
VacantOFFOFF
Occupant classification system failureOFFON
INSPECTION PROCEDURE
1 Check SRS warning light.
CHECK:
Turn the ignition switch to the ON position, and check the SRS warning light condition.
HINT:
If this trouble occurs, the SRS warning light is off. If it is on, a DTC is output. Troubleshoot for the output DTC.
OK:
The SRS warning light does not come on.
NG Check DTC (see page DI±1147).
OK
DIDHT±01

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1491
1685 Author: Date:
2005 SEQUOIA (RM1146U)
SRS Warning Light Circuit Malfunction (Always light up, when
DTC is not output)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition
switch is turned from the LOCK position to ON position, and then goes off automatically.
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.
When terminals TC and CG of the DLC3 are connected, the DTCs are displayed by blinking the SRS warning
light.
DIDHU±01

DI±1496
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1690 Author: Date:
2005 SEQUOIA (RM1146U)
SRS Warning Light Circuit Malfunction (Does not light up, when
ignition switch is turned to on)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter assembly.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition
switch is turned from the LOCK position to the ON position, and then goes off automatically.
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.
When terminals TC and CG of the DLC3 are connected, the DTC is displayed by blinking the SRS warning
light.
WIRING DIAGRAM
See page DI±1491.
INSPECTION PROCEDURE
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the airbag sensor assembly.
(d) Disconnect the connectors from the steering wheel pad.
(e) Disconnect the connectors from the front passenger airbag assembly.
(f) w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.
(g) w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.
(h) Disconnect the connectors from the front seat outer belt LH and RH.
1 Check battery.
CHECK:
Measure the voltage of the battery.
OK:
Voltage: 11 to 14 V
NG Replace battery.
OK
DIDHV±01