TOYOTA CAMRY 1999 Service Repair Manual

H03352H09519H09521H09522
Airbag
Sensor
Assembly Front Airbag
Sensor (RH)
(+) SR+
(±)SR±
Engine Room Main
Wire Harness
SR+
SR±
u "
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±299
11 Check engine room main wire harness.
PREPARATION:
(a) Disconnect the engine room main wire harness connector
on the airbag sensor assembly side.
(b) Using a service wire, connect SR+ and SR± of the con-
nector (on the engine room main wire harness side) be-
tween the engine room main wire harness and the front
airbag sensor (RH).
CHECK:
For the connector (on the engine room main wire harness side)
between the airbag sensor assembly and the engine room main
wire harness, measure the resistance between SR+ and SR±.
OK:
Resistance: Below 1 W
NG Repair or replace engine room main wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room main
wire harness.

H02751
Airbag Sensor Assembly Front Airbag Sensor (LH)
SL+
SL± C515
26 2
1 SL+W±R
BR
SL±C5 DI±300
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DTC B1158/B1159/16 Front Airbag Sensor (LH) Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor (LH) circuit consists of the airbag sensor assembly and front airbag sensor (LH).
For details of the function of each component, see Pub. No. RM654U on page RS±2.
DTC B1158/B1159/16 is recorded when malfunction is detected in the front airbag sensor (LH) circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1158/B1159/16
Front airbag sensor (LH) malfunction

Front airbag sensor (LH)

Wire harness

Airbag sensor assembly
WIRING DIAGRAM
DI4LB±03

H01370AB0119H08065H08066
Airbag
Sensor
Assembly
Front Airbag
Sensor (LH)
(+)SL+
(±)
SL± Airbag Sensor
Assembly
ON
H08399H01370
H08400
Airbag
Sensor
Assembly
Front Airbag
Sensor (LH)
(+)SL+
(±)
SL± Airbag Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±301
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI±305).
2 Check wire harness (to B+).
CHECK:
(a) Turn ignition switch to ON.
(b) For the connector (on the airbag sensor assembly side)
between the front airbag sensor (LH) and the airbag sen-
sor assembly, measure the voltage between body ground
and each of SL+ and SL±.
OK:
Voltage: Below 1 V
NG Repair or replace harness or connector be-
tween front airbag sensor (LH) and airbag sen-
sor assembly.
OK
3 Check wire harness (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (LH) and the airbag sensor as-
sembly, measure the resistance between body ground and
each of SL+ and SL±.
OK:
Resistance: 1 MW or Higher
NG Repair or replace harness or connector be-
tween front airbag sensor (LH) and airbag sen-
sor assembly.
OK

H01370H08058H09524
Airbag
Sensor
Assembly Front Airbag
Sensor (LH)
(+)SL+
(±)
SL± Airbag Sensor
Assembly
H09526H09521H08058H09525
Front Airbag
Sensor (LH)
Airbag
Sensor
Assembly
(+)SL+ Airbag Sensor
Assembly
(±)
SL± SL+SL±
DI±302
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
4 Check wire harness.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (LH) and the airbag sensor as-
sembly, measure the resistance between SL+ and SL±.
OK:
Resistance: 1 MW or Higher
NG Repair or replace harness or connector be-
tween front airbag sensor (LH) and airbag sen-
sor assembly.
OK
5 Check wire harness.
PREPARATION:
Using a service wire, connect SL+ and SL± of the connector (on
the front airbag sensor (LH) side) between the airbag sensor
assembly and the front airbag sensor (LH).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (LH) and the airbag sensor as-
sembly, measure the resistance between SL+ and SL±.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector be-
tween front airbag sensor (LH) and airbag sen-
sor assembly.
OK

H01009H01371H01155
Airbag
Sensor
Assembly
Front Airbag
Sensor (LH)
(+) SL+
(±)SL±
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±303
6 Check front airbag sensor (LH).
CHECK:
For the connector (on the front airbag sensor (LH)), measure
the resistance between SL+ and SL±.
OK:
Resistance: 300 ± 1500 W
NG Replace front airbag sensor (LH).
OK

AB0118
R13006AB0119H01064
H01369
H01154
Front Airbag
Sensor (LH)
Airbag
Sensor
Assembly
ON
or
DTC B1158/B1159/16 ACC
DLC1
E1
Tc
"u "u
DI±304
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
7 Check airbag sensor assembly.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (±) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Connect the front airbag sensor (LH) connector and air-
bag sensor assembly connector.
(d) Connect negative (±) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
(b) Clear DTC stored in memory (See page DI±223).
(c) Turn ignition switch to LOCK, and wait at least for 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
(e) Check DTC (See page DI±223).
OK:
DTC B1158/B1159/16 is not output.
HINT:
Codes other than code B1158/B1159/16 may be output at this
time, but they are not relevant to this check.
NG Replace airbag sensor assembly.
OK
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.

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

AB0117H02756H02774
P/T Squib (RH)P Squib P/T Squib (LH)Airbag Sensor
Assembly
D Squib
Front Airbag
Sensor (RH)Front Airbag
Sensor (LH)
Spiral
Cable LOCK
DI±306
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 Prepare for inspection.
PREPARATION:
(a) Disconnect negative (±) terminal cable from the battery,
and wait at least for 90 seconds.
(b) Remove the steering wheel pad (See Pub. No. RM654U
on page SR±11).
(c) Disconnect the connector of the front passenger airbag
assembly (See Pub. No. RM654U on page RS±28).
(d) Disconnect the connector of the seat belt pretensioner
RH and LH (See Pub. No. RM654U on page BO±126).
(e) Disconnect the connectors of the airbag sensor assembly
(See Pub. No. RM654U on page RS±59).
(f) Disconnect the connector of the front airbag sensor RH
and LH (See Pub. No. RM654U on page RS±64).
CAUTION:
Store the steering wheel pad and front passenger airbag
assembly with the front surface facing upward.

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