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
2BLU/RED BLU/BLK
3
7
BLK
“Q01” Q01-4
Q01-17IG
GND4
[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.
