05-1332
DIAGNOSTICS
DTC
-
SUPPLEMENTAL RESTRAINT SYSTEM
05IVN-01
B1148/36 FRONT AIRBAG SENSOR (RH)
MALFUNCTION
CIRCUIT DESCRIPTION
The airbag front RH sensor circuit consists of the diagnostic circuit and the frontal deceleration sensor, etc.
If the airbag sensor assy center receives signals from the frontal deceleration sensor, it judges whether or
not the SRS should be activated.
DTC B1148/36 is recorded when a malfunction in the airbag front RH sensor is detected.
DTC No.
B1148/36
DTC Detecting Condition
Trouble Area
Short circuit in front airbag sensor RH wire harness (to
B+)
Short circuit in front airbag sensor RH wire harness (to
ground)
Open circuit in +SR wire harness or -SL wire harness of
front airbag sensor RH
Airbag front RH sensor malfunction
Airbag sensor assy center malfunction
Airbag front RH sensor
Airbag sensor assy center
Cowl wire
Engine room main wire
WIRING DIAGRAM
A9
Airbag Front RH Sensor
+SR
Airbag Sensor Assy Center
B-W
3
IK1
W
9
A17 +SR
BR-W
4
IK1
B
20
A17 -SR
2
-SR
1
H02750
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author:
Date:
1522
05-1333
DIAGNOSTICS
-
SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1
CHECK DTC
(a)
Airbag
Front
RH
Sensor
Airbag
Sensor
Assy
Center
(b)
(c)
(d)
(e)
DLC3
DTC B1148/36
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Clear the DTCs stored in memory (see page 05-1215 ).
Turn the ignition switch to the LOCK position.
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Check the DTCs (see page 05-1215 ).
OK:
DTC B1148/36 is not output.
HINT:
Codes other than code B1148/36 may be output at this time, but
they are not related to this check.
CG
TC
H02757
H10600 H16834
H42117
NG
Go to step 2
OK
USE SIMULATION METHOD TO CHECK
2
(a)
(b)
(c)
CHECK CONNECTION OF CONNECTORS
Turn the ignition switch to the LOCK position.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Check that the connectors are properly connected to the airbag sensor assy center and the airbag front
RH sensor.
OK:
The connectors are connected.
NG
CONNECT CONNECTORS, THEN GO TO STEP
1
OK
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author:
Date:
1523
05-1334
DIAGNOSTICS
3
-
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (OPEN)
(a)
Airbag
Front F
RH Sensor
-SR
A9
E
DC
B
+SR
Airbag
Sensor
A
Assy
Center
A17
+SR
-SR
Disconnect the connectors from the airbag sensor assy
center and the airbag front RH sensor.
(b) Using a service wire, connect A9-2 (+SR) and A9-1 (SR) of connector ”E”.
NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
Service Wire
H03353
H08016 C81408
H41800
Tester connection
Condition
Specified condition
A17-9 (+SR) A17-20 (-SR)
Always
Below 1 Ω
NG
Go to step 8
OK
4
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (TO B+)
Airbag
Front F
RH Sensor
E
DC
B
Airbag
Sensor
A
Assy
Center
A17
+SR
-SR
H03355
C81408
H42510
(a)
(b)
(c)
(d)
Disconnect the service wire from connector ”E”.
Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
Turn the ignition switch to the ON position.
Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connection
Condition
Specified condition
A17-9 (+SR) Body ground
Ignition switch ON
Below 1 V
A17-20 (-SR) Body ground
Ignition switch ON
Below 1 V
NG
Go to step 9
OK
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author:
Date:
1524
05-1335
DIAGNOSTICS
5
-
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (TO GROUND)
Airbag
Front F
RH Sensor
E
DC
B
Airbag
Sensor
A
Assy
Center
(a)
(b)
(c)
A17
+SR
-SR
H03355
C81408
H42510
Turn the ignition switch to the LOCK position.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Specified condition
A17-9 (+SR) Body ground
Always
1 MΩ or Higher
A17-20 (-SR) Body ground
Always
1 MΩ or Higher
NG
Go to step 10
OK
6
CHECK FRONT AIRBAG SENSOR (RH) CIRCUIT (SHORT)
(a)
Airbag
Front F
RH Sensor
E
DC
B
Airbag
Sensor
A
Assy
Center
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Specified condition
A17-9 (+SR) A17-20 (-SR)
Always
1 MΩ or Higher
A17
+SR
-SR
H03355
C81408
H42510
NG
Go to step 11
OK
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author:
Date:
1525
05-1336
DIAGNOSTICS
7
-
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK AIR BAG FRONT RH SENSOR
Airbag
Sensor
Front LH
DC
(a)
(b)
Airbag
Sensor
Assy
Center
(c)
(d)
DTC B1148/36
(e)
(f)
(g)
DLC3
DTC B1149/37
CG
(h)
TC
H02757
H10600 H16834
H16835
Connect the connector to the airbag sensor assy center.
Interchange the airbag front RH sensor with the airbag
sensor front LH and connect the connectors to them.
Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Clear the DTCs stored in memory (see page 05-1215 ).
Turn the ignition switch to the LOCK position.
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Check the DTCs (see page 05-1215 ).
Result:
H42118
NG: A
DTC B1149/37 is output.
NG: B
DTC B1148/36 is output.
DTC B1148/36 and B1149/37 are not
output.
OK
NG:A
REPLACE AIR BAG SENSOR FRONT RH
(SEE PAGE 60-55 )
NG:B
REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-53 )
OK
USE SIMULATION METHOD TO CHECK
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author:
Date:
1526
05-1337
DIAGNOSTICS
8
-
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK ENGINE ROOM MAIN WIRE(OPEN)
Engine Room
Main Wire
Airbag
Front
RH
Sensor
(a)
Cowl Wire
F
E
D C
A9
+SR
B
Airbag
Sensor
A
Assy
Center
IK1
-SR
Disconnect the engine room main wire connector from the
cowl wire.
HINT:
Connector ”E” has already been inserted into the service wire.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Specified condition
IK1-3 (+SR) IK1-4 (-SR)
Always
Below 1 Ω
+SR
-SR
H03352
NG
Service Wire
H43424
C81305
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE COWL WIRE
9
CHECK ENGINE ROOM MAIN WIRE(TO B+)
Engine Room
Main Wire
Airbag
Front
F
RH
Sensor
E
Cowl Wire
D C
B
Airbag
Sensor
A
Assy
Center
(a)
(b)
(c)
(d)
IK1
(e)
(f)
-SR
H03354
C81305
+SR
H43447
Turn the ignition switch to the LOCK position.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the engine room main wire connector from the
cowl wire.
Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
Turn the ignition switch to the ON position.
Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connection
Condition
Specified condition
IK1-3 (+SR) Body ground
Ignition switch ON
Below 1 V
IK1-4 (-SR) Body ground
Ignition switch ON
Below 1 V
NG
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE COWL WIRE
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author:
Date:
1527
05-1338
DIAGNOSTICS
10
-
SUPPLEMENTAL RESTRAINT SYSTEM
CHECK ENGINE ROOM MAIN WIRE(TO GROUND)
Engine Room
Main Wire
Airbag
Front
F
RH
Sensor
E
(a)
Cowl Wire
D C
B
Airbag
Sensor
A
Assy
Center
(b)
IK1
Disconnect the engine room main wire connector from the
cowl wire.
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Specified condition
IK1-3 (+SR) Body ground
Always
1 MΩ or Higher
IK1-4 (-SR) Body ground
Always
1 MΩ or Higher
+SR
-SR
H03354
C81305
H43447
NG
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE COWL WIRE
11
CHECK ENGINE ROOM MAIN WIRE(SHORT)
Engine Room
Main Wire
Airbag
Front
F
RH
Sensor
E
(a)
Cowl Wire
D C
B
Airbag
Sensor
A
Assy
Center
IK1
-SR
H03354
C81305
(b)
Disconnect the engine room main wire connector from the
cowl wire.
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection
Condition
Specified condition
IK1-3 (+SR) IK1-4 (-SR)
Always
1 MΩ or Higher
+SR
H43447
NG
REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE COWL WIRE
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author:
Date:
1528