SRS ± Troubleshooting
52B-15
Code No.28, 29, 68 or 69 Front passenger's side
pre-tensioner (squib) system
Probable cause
These diagnosis codes are output if there is abnormal resistance between the input
terminals of the front passenger's side pre-tensioner (squib).
The trouble causes for each diagnosis code No. are as follows.
D Malfunction of wiring harnesses or connectors
D Malfunction of front passenger's side pre-tensioner
(squib)
D Malfunction of SRS-ECU
Code No. Trouble causes
28 D Short in front passenger's side pre-tensioner (squib) or harness short
29 D Open circuit in front passenger's side pre-tensioner (squib) or open harness
D Malfunction of connector contact
68 D Short in front passenger's side pre-tensioner (squib) harness leading to the power
supply
69 D Short in front passenger's side pre-tensioner (squib) harness leading to the earth
Repair
OK
Check trouble symptoms.
NG
Check wiring harness between the front passenger's side pre-ten-
sioner and SRS-ECU.
Repair
OK
Replace SRS-ECU.
NG
NG
Check the following connectors: D-36, D-38 <L.H. drive
vehicles>, D-41 <R.H. drive vehicles>
Replace the front passenger's side pre-tensioner.
SRS check harness
(MB991613)
Check harness
MUT-II Self-diag code
D Disconnect the front passenger's side pre-tensioner connector D-38 <L.H.
drive vehicles>, D-41 <R.H. drive vehicles>
D Insert the probe (MB991222) from the rear of the harness side connector
and connect the 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 No.28, 29, 68 or 69 displayed?
Resistance (3 Ω)
YES NO
Resistance (3 Ω)
Check harness
Probe
(MB991222)
Body wiring harness
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