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DTC Troubleshooting
Step
1
Check air bag communication circuit
1) Turn ignition switch to OFF position.
2) Disconnect connector from SDM referring to "SDM
Removal and Installation: in Section 8B".
3) Disconnect connector from junction block assembly.
4) Turn ignition switch to ON position.
5) Measure voltage between "L29-37" terminal of SDM
connector and vehicle body ground.
Is voltage 0 V?
2
Check air bag communication circuit
1) Turn ignition switch to OFF position.
2) Connect connectors to junction block assembly.
3) Turn ignition switch to ON position.
4) Measure voltage between "L04-2" terminal of junction
block assembly connector and vehicle body ground.
Is voltage 4 – 6 V?
3
Check air bag communication circuit
1) Measure voltage between "L29-37" terminal of SDM
connector and vehicle body ground.
Is voltage 4 – 6 V?
Action
Body Electrical Control System:
Yes
Go to Step 2.
Go to Step 3.
Substitute a known-
good SDM and recheck.
10B-21
No
Short to power supply in
air bag communication
circuit.
Short to ground in air
bag communication
circuit. If OK, substitute
a known-good BCM
(included in junction
block assembly) and
recheck.
Open or high resistance
in air bag
communication circuit.
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