1999 TOYOTA CAMRY warning light

DI1B0±10
H10307
Combination Meter
(Warning Light)Steering Wheel Pad
(with Airbag)
Airbag Sensor AssemblyFront Passenger
Airbag Assembly
Seat Belt
Pretensioner (LH)Seat Belt
Pretensioner (RH) Front Airbag
Sensor (LH)Front Airbag Sensor (RH)
Spiral Cable
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±231
PARTS LOCATION

DI1B1±15
H01357
C5
C4C6
287 8 9 10 16 17
18A B12 3 4 5 6
11 12 15 14 13
AABB
19 20 21 22 23 24 25 26 27 1 2 3 4 5 6
7 8 9 10 11 121 2 3 4 5 6
7 8 9 10 11 12 DI±232
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
TERMINALS OF ECU
No.SymbolTerminal Name
A±Electrical Connector Check Mechanism
B±Electrical Connector Check Mechanism
C5 ± 3LASRS Warning Light
C5 ± 4GSWEFI ECU
C5 ± 5IG2Power Source (IGN Fuse)
C5 ± 6ACCPower Source (CIG Fuse)
C5 ± 9SR+Front Airbag Sensor (RH)
C5 ± 10P+Squib (Passenger)
C5 ± 11P±Squib (Passenger)
C5 ± 12SILDiagnosis
C5 ± 13D±Squib (Driver)
C5 ± 14D+Squib (Driver)
C5 ± 15SL+Front Airbag Sensor (LH)
C5 ± 19TcDiagnosis
C5 ± 20SR±Front Airbag Sensor (RH)
C5 ± 26SL±Front Airbag Sensor (LH)
C5 ± 27E1Ground
C5 ± 28E2Ground
C4 ± 1PL±Squib (Seat Belt Pretensioner, LH)
C4 ± 2PL+Squib (Seat Belt Pretensioner, LH)
C6 ± 5PR+Squib (Seat Belt Pretensioner, RH)
C6 ± 6PR±Squib (Seat Belt Pretensioner, RH)

DI164±25
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±233
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
SymptomSuspect AreaSee page

With the ignition switch in ACC or ON position, the SRS warning
light sometimes lights up after approx. 6 seconds have elapsed.
SRS warning light circuit
(Al li ht h i iti it h i i LOCK iDI 308
SRS warning light is always lit up even when ignition switch is in
the LOCK position.(Always lights up when ignition switch is in LOCK posi-
tion.)DI±308

With the ignition switch in ACC or ON position, the SRS warning
light does not light up.
SRS warning light circuit
(Does not light up when ignition switch is turned to ACC or
ON.)
DI±308

DTC is not displayed.

SRS warning light is always lit up at the time of DTC check pro-
cedure.
Tc terminal circuitDI±313

DTC is displayed without Tc and E1 terminal connection.

H02288
15A CIG
L±R 2Airbag Sensor
Assembly 2
3 4
6 7
6
3B±R
65A IGN
C5 1K
IF 1K
1N1N
C5 Instrument Panel J/B
30A AM2
W±R W±R1
4 40A AM1
2L
1K2A
1B
1K1B
55 W2
1
2 Instrument Panel J/B
AF14 F9F11 FL MAIN
B±G
100A
ALT
Instrument Panel J/B Junction
Connector
W±B7
1J 1NW±BC5
1 Battery
1 1
2
5
B±O
GR
ACCIG2 Fusible Link Block
27
E1 Ignition Switch1 B±RB
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±305
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.
The diagnosis system malfunction display for this circuit is different from other circuits that is when the SRS
warning light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.Diagnosis
(Normal)Source voltage drop
WIRING DIAGRAM
DI1BN±12

AB0119H01298H01299
Airbag Sensor Assembly
ON
ACC
IG2
(+) (±)
H01249
ON
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±307
2 Check source voltage.
PREPARATION:
Connect negative (±) terminal cable to the battery.
CHECK:
(a) Turn ignition switch ON.
(b) Measure the voltage each of IG2 and ACC on the sensor
and operate electric system (defogger, wiper, headlight,
heater blower, etc.).
OK:
Voltage: 10 ± 14 V
NG Check harness between battery and airbag sen-
sor assembly, and check battery and charging
system.
OK
3 Does SRS warning light turn off?
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) Connect the airbag sensor assembly connectors.
(e) Connect the seat belt pretensioner connectors.
(f) Connect the front airbag sensor connectors.
(g) Turn ignition switch to ON.
CHECK:
Operate electric system (defogger, wiper, headlight, heater
blower, etc.) and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

H02289
2 Airbag Sensor
Assembly
237
B±Y
12 IE2 LG
AB10A
ECU±B
Short Pin
W±R
1W Engine Room J/B No.2
11 B
A
A 3
LG
5DLC1 1 Battery
4 J2 Junction
Connector
1G2J 2A B±G
F9 F11 FL MAINFusible Link Block
1
1
TCP±B7Instrument Panel J/B
C5
B A LAW±R
LG
13
TC LG
LG±RIG3 LG±R11
B B
TC LG±R J2 Junction
Connector
19
DLC2 SRS Warning Light
IG3 C5 DI±308
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
SRS Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from the LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by blinking the SRS warning
light.
WIRING DIAGRAM
DI64R±01

AB0117H01293H01295
Airbag Sensor Assembly
LOCK
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±309
INSPECTION PROCEDURE
Always lit up, when ignition switch is in LOCK position
1 Prepare for inspection. (See step 1 on page DI±305)
2 Does SRS warning light turn off?
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (±) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
(d) Connect negative (±) terminal cable to the battery.
CHECK:
Check operation of SRS warning light.
NO Check SRS warning light circuit or terminal AB
circuit of DLC1.
YES
Replace airbag sensor assembly.

N14677
Fuse
AB0119H01300
H01301
Airbag Sensor Assembly
ON
LA
(+)
(±)
DI±310
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
Does not light up, when ignition switch is turned to ACC or ON
1 Check ECU±B Fuse.
PREPARATION:
Remove ECU±B fuse.
CHECK:
Check continuity of ECU±B fuse.
OK:
Continuity
HINT:

Fuse may be burnt out even if it appears to be OK during
visual inspection.

If fuse is OK, install it.
NG Go to step 5.
OK
2 Prepare for inspection. (See step 1 on page DI±305)
3 Check SRS warning light circuit.
PREPARATION:
(a) Connect negative (±) terminal cable to the battery.
(b) Turn ignition switch to ACC or ON.
CHECK:
Measure the voltage LA terminal of the harness side connector
of the airbag sensor assembly.
OK:
Voltage: 10 ± 14 V
NG Check SRS warning light bulb or repair SRS
warning light circuit.
OK