23
Code No. 21 or 22 Air bag module (squib) system Probable cause
(1) These diagnosis codes are output if there is abnormal resistance between the
input terminals of the air bag module (squib).
The trouble causes for each code No. are as follows (Refer to chart 1.)
(2) Diagnosis codes 21 and 22 are sometimes generated in combination with
malfunction codes relating to the front impact sensor (code Nos. 11, 12 and 13),
but sometimes only one may be output instead of both being memorised.
Because of this, the front impact sensor should also be inspected at the same
time. The relationship between the codes are as follows. (Refer to chart 2.)·
Malfunction of clock spring
·
Disconnected connector in the driver’s side air bag
module (squib)
·
Open-circuit in clock spring due to inappropriate neutral
position
·
Malfunction of harnesses or connectors
·
Malfunction of air bag module (squib)
·
Malfunction of SDU
Chart 1
Code No. Trouble symptom
21
· Short in air bag module (squib) or harness short
· Short in clock spring
· Short in air bag module (squib) or front impact sensor harnesses leading to the power supply
22
· Open circuit in air bag module (squib) or open harness
· Open circuit in clock spring
· Disconnected connector in the driver’s side air bag module (squib).
· Open circuit in clock spring due to inappropriate neutral position.
· Malfunction of connector contact
· Short in air bag module (squib) or front impact sensor harnesses leading to the power supply
Chart 2
Item Front impact sensor
ShortOpen circuit
(1 sensor)Open circuit
(2 sensors)
Air bag module (squib) Short 11 or 21 12 or 21 13 or 21
Open circuit 11 or 22 12 or 22 13 or 22
Caution
Do not attempt to measure the air bag module (squib) circuit resistance. Use of a tester in
measuring the circuit resistance will supply current to the squib, or erroneous deployment due to
static electricity could cause serious injury.
SRS - Troubleshooting52B-8
