
SRS –
Troubleshooting
52B-8
Code No.21, 22, 61 or 62 Driver’s side air bag module
(squib) system
Probable cause
These diagnosis codes are output if there is abnormal resistance between the input
terminals of the driver’s side air bag module (squib).
The trouble causes for each diagnosis code No. are as follows.
D
Malfunction of clock spring
D
Partial disconnection due to incorrect clock spring
neutral position
D
Malfunction of wiring harnesses or connectors
D
Malfunction of driver’s side air bag module (squib)
D
Malfunction of SRS-ECU
Code No.
Trouble symptom
21
D
Short in driver’s side air bag module (squib) or harness short
D
Short in clock spring
D
Malfunction of connector*
22
D
Open circuit in driver’s side air bag module (squib) or open harness
D
Open circuit in clock spring
D
Malfunction of connector contact
61
D
Short in driver’s side air bag module (squib) harness leading to the power supply
62
D
Short in driver’s side air bag module (squib) harness leading to the earth
NOTE
*:
The connector in the squib circuit has a built-in short bar which short-circuits between plus (+) lead and minus
(–) lead of the squib circuit when the connector is not being connected to prevent an accidental air bag deployment
possibly caused by static electricity, etc. Therefore, malfunction of the connector can also be caused by this
short bar which fails to be released even when the connector is reconnected if it is damaged.
MUT-
II
Self-diag code
D
Disconnect clock spring
connector B-82.
D
Connect SRS check har-
ness connector (1).
D
Erase diagnosis code
memory.
Are code Nos.21, 22, 61 or
62 output?
Yes
Check the following
connectors:
B-82, B-51
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wire
between the SRS-ECU
and clock spring.
NG
Repair
OK
Replace the SRS-ECU.
No
Check the clock spring. (Refer to P.52B-30.)
NG
Repair
OK
Replace the driver’s side air bag module.
SRS check harness
(MB991613)
Body wiring
harness
Clock spring
1