DTC B1158/B1159/16 Front Airbag Sensor (LH) Malfunction
DTC B1158/B1159/16 Front Airbag Sensor (LH) Malfunction
DTC B1158/B1159/16 Front Airbag Sensor (LH) Malfunction
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DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
DI–667<br />
DI55M–03<br />
<strong>DTC</strong> <strong>B1158</strong>/<strong>B1159</strong>/<strong>16</strong> <strong>Front</strong> <strong>Airbag</strong> <strong>Sensor</strong> (<strong>LH</strong>) <strong>Malfunction</strong><br />
CIRCUIT DESCRIPTION<br />
The front airbag sensor (<strong>LH</strong>) circuit consists of the airbag sensor assembly and front airbag sensor (<strong>LH</strong>).<br />
For details of the function of each component, see OPERATION on page RS–2.<br />
<strong>DTC</strong> <strong>B1158</strong>/<strong>B1159</strong>/15 is recorded when malfunction is detected in0 the front airbag sensor (<strong>LH</strong>) circuit.<br />
<strong>DTC</strong> No. <strong>DTC</strong> Detecting Condition Trouble Area<br />
<strong>B1158</strong>/<strong>B1159</strong>/<strong>16</strong><br />
<strong>Front</strong> airbag sensor (<strong>LH</strong>) malfunction<br />
<strong>Front</strong> airbag sensor (<strong>LH</strong>)<br />
<strong>Airbag</strong> sensor assembly<br />
Wire harness<br />
Cowl wire harness<br />
WIRING DIAGRAM<br />
F9<br />
<strong>Front</strong> <strong>Airbag</strong> <strong>Sensor</strong> (<strong>LH</strong>)<br />
<strong>Airbag</strong> <strong>Sensor</strong> Assembly<br />
SL+<br />
2<br />
W–R<br />
1<br />
IF3<br />
W–R<br />
15<br />
C21<br />
SL+<br />
SL–<br />
1<br />
B<br />
2<br />
IF3<br />
B<br />
26<br />
C21<br />
SL–<br />
H02750<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
929
DI–668<br />
DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
INSPECTION PROCEDURE<br />
1 Prepare for inspection. (See step 1 on page DI–675)<br />
2 Check front airbag sensor (<strong>LH</strong>) circuit.<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
<strong>Airbag</strong> <strong>Sensor</strong><br />
Assembly<br />
CHECK:<br />
For the connector (on the airbag sensor assembly side) between<br />
the front airbag sensor (<strong>LH</strong>) and the airbag sensor assembly,<br />
measure the resistance between SL+ and SL–.<br />
OK:<br />
Resistance: 754 – 886 Ω<br />
(+)<br />
SL+<br />
H03350<br />
H08058<br />
(–)<br />
SL–<br />
H09468<br />
NG Go to step 6.<br />
OK<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
930
DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
DI–669<br />
3 Check front airbag sensor (<strong>LH</strong>) circuit (to ground).<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
<strong>Airbag</strong> <strong>Sensor</strong><br />
Assembly<br />
CHECK:<br />
For the connector (on the airbag sensor assembly side) between<br />
the front airbag sensor (<strong>LH</strong>) and the airbag sensor assembly,<br />
measure the resistance between SL+ and body<br />
ground.<br />
OK:<br />
Resistance: 1 MΩ or Higher<br />
(+)<br />
SL+<br />
(–)<br />
H03350<br />
H08060<br />
H09469<br />
NG Go to step 9.<br />
OK<br />
4 Check front airbag sensor (<strong>LH</strong>) circuit (to B+).<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
ON<br />
(+)<br />
SL+<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
<strong>Airbag</strong> <strong>Sensor</strong><br />
Assembly<br />
PREPARATION:<br />
Connect negative (–) terminal cable to the battery, and wait at<br />
least for 2 seconds.<br />
CHECK:<br />
(a) Turn ignition switch to ON.<br />
(b) For the connector (on the airbag sensor assembly side)<br />
between the front airbag sensor (<strong>LH</strong>) and the airbag sensor<br />
assembly, measure the voltage between SL+ and<br />
body ground.<br />
OK:<br />
Voltage: Below 1 V<br />
H03350<br />
AB0119<br />
H08062<br />
(–)<br />
H09470<br />
NG Go to step 7.<br />
OK<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
931
DI–670<br />
DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
5 Check airbag sensor assembly.<br />
CG<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
DLC3<br />
H02757<br />
AB0119<br />
H10600 H01064<br />
ON<br />
Tc<br />
→ ←<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
<strong>DTC</strong> <strong>B1158</strong>/<strong>B1159</strong>/<strong>16</strong><br />
H10647<br />
PREPARATION:<br />
(a) Turn ignition switch to LOCK.<br />
(b) Disconnect negative (–) terminal cable from the battery,<br />
and wait at least for 90 seconds.<br />
(c) Connect the front airbag sensor (<strong>LH</strong>) connector and airbag<br />
sensor assembly connector.<br />
(d) Connect negative (–) terminal cable to the battery, and<br />
wait at least for 2 seconds.<br />
CHECK:<br />
(a) Turn ignition switch to ON, and wait at least for 20 seconds.<br />
(b) Clear <strong>DTC</strong> stored in memory.<br />
(See page DI–588)<br />
(c) Turn ignition switch to LOCK, and wait at least for 20 seconds.<br />
(d) Turn ignition switch to ON, and wait at least for 20 seconds.<br />
(e) Check <strong>DTC</strong>.<br />
(See page DI–588)<br />
OK:<br />
<strong>DTC</strong> <strong>B1158</strong>/<strong>B1159</strong>/<strong>16</strong> is not output.<br />
HINT:<br />
Codes other than code <strong>B1158</strong>/<strong>B1159</strong>/<strong>16</strong> may be output at this<br />
time, but they are not relevant to this check.<br />
NG<br />
Replace airbag sensor assembly.<br />
OK<br />
From the results of the above inspection, the malfunctioning part can now be considered normal.<br />
To make sure of this, use the simulation method to check.<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
932
DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
DI–671<br />
6 Check front airbag sensor (<strong>LH</strong>).<br />
← →<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
SL+<br />
SL–<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
PREPARATION:<br />
Disconnect the front airbag sensor connector (<strong>LH</strong>).<br />
CHECK:<br />
For the connector (on the front airbag sensor side), measure<br />
the resistance between SL+ and SL–.<br />
OK:<br />
Resistance: 754 – 886 Ω<br />
H04504<br />
H01062<br />
(+)<br />
(–)<br />
H04505<br />
NG<br />
Replace front airbag sensor (<strong>LH</strong>).<br />
OK<br />
7 Check cowl wire harness.<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
Cowl Wire Harness<br />
SL–<br />
← →<br />
SL+<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
PREPARATION:<br />
Disconnect the cowl wire harness connector on the airbag sensor<br />
assembly side.<br />
CHECK:<br />
For the connector (on the cowl wire harness side) between the<br />
front airbag sensor (<strong>LH</strong>) and the cowl wire harness, measure<br />
the resistance between SL+ and SL–.<br />
OK:<br />
Resistance: 1 MΩ or Higher<br />
(–)<br />
(+)<br />
H03351<br />
H03359<br />
H03441<br />
NG<br />
Repair or replace cowl wire harness.<br />
OK<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
933
DI–672<br />
DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
8 Check cowl wire harness.<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
SL–<br />
(–)<br />
(+)<br />
Cowl Wire Harness<br />
SL+<br />
SL–<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
SL+<br />
PREPARATION:<br />
Using service wire, connect SL+ and SL– of the connector (on<br />
the cowl wire harness side), between the airbag sensor assembly<br />
and the cowl wire harness.<br />
CHECK:<br />
For the connector (on the cowl wire harness side) between the<br />
front airbag sensor (<strong>LH</strong>) and the cowl wire harness, measure<br />
the resistance between SL+ and SL–.<br />
OK:<br />
Resistance: Below 1 Ω<br />
H03352<br />
H03359 H06142<br />
H07963<br />
NG<br />
Repair or replace cowl wire harness.<br />
OK<br />
Repair or replace harness or connector between airbag sensor assembly and cowl wire harness.<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
934
DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
DI–673<br />
9 Check wire harness (to ground).<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
(+)<br />
← →<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
<strong>Airbag</strong> <strong>Sensor</strong><br />
Assembly<br />
SL–<br />
PREPARATION:<br />
Disconnect the front airbag sensor connector (<strong>LH</strong>).<br />
CHECK:<br />
For the connector (on the airbag sensor assembly side) between<br />
the front airbag sensor (<strong>LH</strong>) and the airbag sensor assembly,<br />
measure the resistance between body ground and<br />
each of SL+ and SL–.<br />
OK:<br />
Resistance:1 MΩ or Higher<br />
H03353<br />
H03361<br />
(–)<br />
SL+<br />
H03443<br />
OK<br />
Replace front airbag sensor (<strong>LH</strong>).<br />
NG<br />
10 Check cowl wire harness (to ground).<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
Cowl Wire Harness<br />
← →<br />
SL–<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
SL+<br />
PREPARATION:<br />
Disconnect the cowl wire harness connector on the airbag sensor<br />
assembly side.<br />
CHECK:<br />
For the connector (on the cowl wire harness side) between the<br />
front airbag sensor (<strong>LH</strong>) and the cowl wire harness, measure<br />
the resistance between body ground and each of SL+ and SL–.<br />
OK:<br />
Resistance:1 MΩ or Higher<br />
(–)<br />
(+)<br />
NG<br />
Repair or replace cowl wire harness.<br />
H03354<br />
H06876<br />
H07964<br />
OK<br />
Repair or replace harness or connector between airbag sensor assembly and cowl wire harness.<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
935
DI–674<br />
DIAGNOSTICS<br />
–<br />
SUPPLEMENTAL RESTRAINT SYSTEM<br />
11 Check wire harness (to B+).<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
ON<br />
(+)<br />
← →<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
<strong>Airbag</strong> <strong>Sensor</strong><br />
Assembly<br />
SL–<br />
PREPARATION:<br />
(a) Disconnect the front airbag sensor connector (<strong>LH</strong>).<br />
(b) Turn ignition switch to ON.<br />
CHECK:<br />
For the connector (on the airbag sensor assembly side) between<br />
the front airbag sensor (<strong>LH</strong>) and the airbag sensor assembly,<br />
measure the voltage between body ground and each<br />
of SL+ and SL–.<br />
OK:<br />
Voltage: Below 1 V<br />
H03355<br />
AB0119<br />
H03363<br />
(–)<br />
SL+<br />
H03445<br />
OK<br />
Replace front airbag sensor (<strong>LH</strong>).<br />
NG<br />
12 Check cowl wire harness (to B+).<br />
<strong>Front</strong> <strong>Airbag</strong><br />
<strong>Sensor</strong> (<strong>LH</strong>)<br />
ON<br />
Cowl Wire Harness<br />
← →<br />
SL–<br />
<strong>Airbag</strong><br />
<strong>Sensor</strong><br />
Assembly<br />
SL+<br />
PREPARATION:<br />
Disconnect the cowl wire harness connector on the airbag sensor<br />
assembly side.<br />
CHECK:<br />
For the connector (on the cowl wire harness side) between the<br />
front airbag sensor (<strong>LH</strong>) and the cowl wire harness, measure<br />
the voltage between body ground and each of SL+ and SL–.<br />
OK:<br />
Voltage: Below 1 V<br />
(–)<br />
(+)<br />
NG<br />
Repair or replace cowl wire harness.<br />
H03354<br />
AB0119 H06143<br />
H07965<br />
OK<br />
Repair or replace harness or connector between airbag sensor assembly and cowl wire harness.<br />
2003 TOYOTA TACOMA (RM1002U)<br />
Author:<br />
Date:<br />
936
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