8B
DTC B1022: Driver Air Bag Initiator Circuit Resistance Low
Wiring Diagram
Refer to “Wiring Diagram” in DTC B1021: Driver Air Bag Initiator Circuit Resistance High .
DTC Will Set when
The combined resistance of the driver air bag (inflator) module, contact coil assembly, harness wiring and connector terminal contact is below a specified value for specified time.
Flow Test Description
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.
Step 3: Check whether malfunction is in contact coil or driver air bag (inflator) module.
Troubleshooting
Step Action YES NO
1
1) With ignition switch OFF, disconnect contact coil connector “G61” located near the base of the steering column.
2) Check proper connection to contact coil at terminals in “G61” connector.
3) If OK, then connect special tools (B) and (C) to contact coil connector “G61”.
Special Tool
(B) : 09932–75010
(C) : 09932–78340
With ignition switch ON, does DTC B1022 still exist?
Go to Step 2.
Go to Step 3.
2
1) With ignition switch OFF, disconnect SDM connector “G102”.
2) Check proper connection to SDM at terminals “G102-9” and “G102-10”.
3) If OK, release shorting bar in SDM connector inserting release tool (1) included in special tool (A).
4) Measure resistance between “G102-9” and “G102-10” terminals with connected special tools (B) and (C) to “G61” connector.
Special Tool
(A) : 09932–76010
(B) : 09932–75010
(C) : 09932–78340
Is resistance 1.7 Ω or more?
Substitute a known-good SDM and recheck.
Repair short from “GRN” wire circuit to “GRN/RED” wire circuit or from “GRN” or “GRN/RED” wire circuit to other wire circuit.
3
1) With ignition switch OFF, disconnect special tools (B) and (C) from “G61” connector, then reconnect contact coil connector “G61” located near the base of the steering column as it was.
2) Remove driver air bag (inflator) module from steering wheel referring to Driver Air Bag (Inflator) Module Removal and Installation .
3) Check proper connection to driver air bag (inflator) module at terminals in “Q02” connector.
4) If OK, then connect special tools (A), (B) and (D) to “Q02” connector.
Special Tool
(A) : 09932–76010
(B) : 09932–75010
(C) : 09932–78340
(D) : 09932–78310
With ignition switch ON, does DTC B1022 still exist?
Ignition switch OFF.
Replace contact coil assembly referring to Combination Switch (For Vehicle without Air Bag System)/Contact Coil and Combination Switch Assembly (For Vehicle with Air Bag System) Removal and Installation .
Ignition switch OFF.
Replace driver air bag (inflator) module referring to Driver Air Bag (Inflator) Module Removal and Installation .
NOTE:
Upon completion of inspection and repair work, perform the following items.
• Reconnect all air bag system components, ensure all components are properly mounted.
• Clear DTCs (Refer to DTC Clearance .), if any.
• Repeat Air Bag Diagnostic System Check to confirm that the trouble has been corrected.