SRS ± Troubleshooting
52B-22
INSPECTION CHART FOR TROUBLE SYMPTOMS
Get an understanding of the trouble symptoms and check according to the inspection procedure chart.
Trouble Inspection procedure No(s). Reference page
Communication with MUT-II is impossible. 1 52B-22
SRS warning lamp does not come on. See diagnosis code No.43. 52B-17
SRS warning lamp does not go out. See diagnosis code Nos.43, 44. 52B-17
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication with MUT-II is impossible.
Probable cause
When communication with all systems is impossible, diagnosis circuit is suspected
as faulty.
When only communication with SRS air bags is impossible, open in diagnosis output
circuit or power supply circuit including earth circuit may be present.
D Defective wiring harness(es) or connector(s)
D Malfunction of SRS-ECU
Check MUT-II diagnosis circuit, and repair if necessary.
NG
Repair
OK
Check trouble symptoms.
NG
Check harness wire between SRS-ECU and ignition switch IG
1,
repair if necessary.
Check harness wire between SRS-ECU and diagnosis connector.
Replace SRS-ECU.
Check following connectors: B-32, C-35
OK
NG
NG
OK
Check trouble symptoms.
Repair
NG
Repair
No
Can MUT±II communicate with other systems?
Yes
Check following connector: C-32
Check following connectors: C-32, C-74, C-75
(1)NG
Check harness wire between SRS-ECU and earth, and repair
if necessary.
Measure at SRS-ECU connector C-32.
D Disconnect connector and measure at harness side.
(1) Conductivity between terminal (7) and body earth
OK: Conductive
D Connect negative (±) battery terminal.
D Ignition switch: ON
(2) Voltage between terminal (13) and body earth
OK: 9 V or more
(3) Voltage between terminal (16) and body earth
OK: 9 V or more
(2), (3)NG
Check trouble symptoms.
OK
NG
NG
Repair
OK
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