Toyota Sequoia (2005). Manual — part 363
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1247
1441
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 Condition
Trouble 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
H23996
LA
A20
14
AB
R
I18
Ignition SW
Combination Meter
Battery
IG2
A20
21
E1
A20
25
E2
A20
26
B
W–B
W–B
B–R
IG2
AM2
6
5
W–R
SRS
B–Y
C5
29
C6
12
C6
24
1D
4
1A
5
1A
3
IGN1
1D
6
1F
9
10
1A
6
1A
8
Instrument Panel J/B
Engine Room J/B
1H
11
1J
7
2C
1
2D
1
AM2
BR
W–B
W–B
J8
J/C
A
A
4
5
B
B
B–O
IE
Airbag Sensor
Assembly
1C
2
Instrument Panel J/B
F10
Fusible Link Block
1C
3
D6
DLC3
11
4B
10
4A
20
4A
10
B–Y
B–Y
1F
W–R
Sub J/B No. 4
DI–1248
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1442
WIRING DIAGRAM
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1249
1443
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
OK
H22564
H23040
I27704
H23986
A
Cowl Wire
Combination
Meter
C5
A20
Airbag
Sensor
Assembly
B
C
D
C5–29
LA
DI–1250
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1444
4
Check cowl wire (airbag sensor assembly – combination meter).
PREPARATION:
Disconnect the connector from the combination meter.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Condition
Specified Condition
A20–14 (LA) – C5–29
Always
Below 1
Ω
A20–14 (LA) –
Body ground
Always
1 M
Ω
or higher
NG
Repair or replace cowl wire.
OK
Replace airbag sensor assembly (see page
).
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