10B-28 AIR BAG SYSTEM
DTC B1021 – Driver Air Bag Initiator Circuit Resistance High
DTC B1022 – Driver Air Bag Initiator Circuit Resistance Low
DTC B1024 – Driver Air Bag Initiator Circuit Short to Ground
DTC B1025 – Driver Air Bag Initiator Circuit Short to Power Circuit
WIRING DIAGRAM
DTC WILL SET WHEN
DTC B1021 :
The combined resistance of the driver air bag (inflator) module, contact coil assembly, harness wiring and con-
nector terminal contact is above a specified value for specified time.
DTC B1022 :
The combined resistance of the driver air bag (inflator) module, contact coil assembly, harness wiring and con-
nector terminal contact is below a specified value for specified time.
DTC B1024 :
The voltage measured at driver air bag initiator circuit is below a specified value for specified time.
DTC B1025 :
The voltage measured at driver air bag initiator circuit is above a specified value for specified time.
TABLE TEST DESCRIPTION
DTC B1021, B1022, B1024 and B1025 :
STEP 1 : Check whether malfunction is in contact coil and driver air bag (inflator) module or the others.
STEP 2 : Check driver air bag (inflator) module initiator circuit in air bag harness.
STEP 3 : Check whether malfunction is in contact coil or driver air bag (inflator) module.
[A] : Shorting bar 2. Ignition switch 5. Contact coil assembly
[B] : Airbag harness 3. “AIR BAG” fuse 6. Driver air bag (inflator) module
1. From main fuse 4. SDM 7. Ground for air bag system
1
2
BLU/REDBLU/BLK
3
7
BLK
“Q01”
Q01-4
Q01-17
IG
GND
4
[A]
[B]
GRN/RED
GRN
Q01-10
Q01-9
D-
D+
“Q06”
“Q01”
“Q05”
6
5
CAUTION:
• Be sure to perform AIR BAG DIAGNOSTIC SYSTEM CHECK before starting diagnosis according to
flow table.
• When measurement of resistance or voltage is required in this table, use a tester along with a cor-
rect terminal adapter from special tool (Connector test adapter kit).
• When a check for proper connection is required, refer to INTERMITTENT AND POOR CONNEC-
TIONS in this section.
• If there is open circuit in the air bag wire harness, connector or terminal is found damaged, replace
the wire harness, connector and terminal as an assembly.
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