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DI-441
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI1BM-21
DTC B1100/31 Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit and
ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and detects
diagnosis system malfunction.
DTC B1100/31 is recorded when occurrence of a malfunction in the airbag sensor assembly is detected.
DTC No. DTC Detecting Condition Trouble Area
B1100/31 S Airbag sensor assembly malfunction S Airbag sensor assembly
INSPECTION PROCEDURE
HINT:
When a malfunction code other than code B1100/31 is displayed at the same time, first repair the malfunction
indicated by the malfunction code other than code B1100/31.
1 Prepare for inspection. (See step 1 on page DI-456 )
2 Check voltage at IG2 and ACC of airbag sensor assembly.
Airbag Sensor Assembly CHECK:
ON
(a) Turn ignition switch to ON.
(b) Measure the voltage between body ground and each of
terminals IG2 and ACC of the airbag sensor assembly
ACC IG2 connector.
(-) (+) OK:
Voltage: Below 10 - 14 V
AB0119
H01298 H01299
NG Check that an abnormality occurs on the battery
and charging system.
OK
2002 4RUNNER (RM887U)
Author : Date : 617
DI-442
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 Is DTC B1100/31 output again?
PREPARATION:
ACC ON
Clear DTC.
(See step 5 on page DI-377 )
CHECK:
or
(a) Turn ignition switch to LOCK, and wait at least for 20 se-
conds.
(b) Turn ignition switch to ACC or ON, and wait at least for 20
DLC1 DTC B1100/31 seconds.
(c) Repeat operation in step (a) and (b) at least 5 times.
(d) Check DTC.
(See page DI-377 )
E1 Tc HINT:
Codes other than code B1100/31 may be output at this time, but
AB0118 AB0119
R13006 FI1394 H00022 they are not relevant to this check.
NO Using simulation method, reproduce malfunc-
tion symptoms. (See page IN-18 )
YES
Replace airbag sensor assembly.
2002 4RUNNER (RM887U)
Author : Date : 618
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