SRS ± Troubleshooting
52B-12
Code No.21, 22, 61, 62
Driver's air bag module (squib) system
Probable cause
Abnormal resistance is present between input terminals of driver's air bag module
(squib). See table below for what each code tells.
However, once trouble is extinguished, SRS-warning lamp will go out. (Diagnosis
code will remain stored)
D Malfunction of clock spring
D Partially open as clock spring is not in neutral position
D Defective wiring harnesses or connectors
D Malfunction of driver's air bag module (squib)
D Malfunction of SRS-ECU
Code No. Trouble causes
21 D Short in driver's air bag module (squib) or harness short
D Short in clock spring
D Defective connector*
22 D Open in driver's side air bag module (squib) or open harness
D Open in clock spring
D Disconnected driver's air bag module (squib) connector
D Partially open as clock spring is not in neutral position
D Poor connector contact*
61 D Driver's air bag module (squib) harness shorted to power supply
62 D Driver's air bag module (squib) harness short to the earth
NOTE
*: The shorting bars, which short positive (+) and negative (±) wires to prevent the air bags from accidental deployment
during the disconnection of the connector, are set in the squib circuit connectors. In a defective connector, the short-bar
may be still working even after the connection of the connector.
Check the following connectors: C-32, C-65
Repair
OK
Check trouble symptoms.
NG
Check wiring harness between clock spring and SRS-ECU.
Repair
OK
Replace SRS-ECU.
NO
Check clock spring. (Refer to P.52B-42.)
NG
Replace
NG
NG
Replace driver's air bag module (squib).
SRS check harness
(MB991613)
Instrument panel
wiring harness
connector (2-pin)
Check harness
MUT-II Self-diag code
D Connect clock spring connector No.1 C-65 and the harness side connector
(2-pin).
D Remove the cover from the No. 2 connector of the clock spring, and
then insert the probes (MB991222) and connect check harness to the
probe.
Caution
Never insert the probe directly to the terminals from the front of
the connector.
D Disconnect the resistance connector from the SRS check harness
(MB991613) and connect to the check harness.
D Connect the negative (±) battery terminal.
D Erase diagnosis code memory.
Is code Nos.21, 22, 61 or 62 displayed?
Resistance (3 Ω)
2
1
YES NO
Resistance (3 Ω)
Check harness
Probe
(MB991222)
Cover
2
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