Safety airbag-12
Begin the test with diagnostic communication with special diagnostic device (X-431 diagnostic tester) and ECU
to find out the failure causes, do the next test providing communication is not successful.
Procedure
Test
O peration
Yes Next
procedure
1
Test the battery
Test the battery voltage
Is the voltage higher 9V?
No
Insufficient battery supply.
Test the charging/discharging
system, then go to step 5.
Yes Next
step
2
Test the wiring harness connection between ECU and
combined instrument.
Place the ignition switch in LOC K position
。
Shut off the battery negative.
Open the central channel guard plate.
Shut off the instrument combined connector clip
Connect the negative of battery
Place the ignition switch in ON position.
Check whether the instrument connector clip terminal
voltage is 12V(power supply and instrument line)
No
Check the circuit and continue the
operation according to step 5.
Yes Next
step
3
Place the ignition switch in LOC K position
。
Check the connection of corresponding terminals between
instrument connector clip and diagnostic interface
(diagnose the two ends of K-line)
No
Repair or replace the wiring
harness and continue according to
step 5
Yes Next
step
3
Make sure the shutoff of accumulator negative line and
keep the status for at least 1 minute.
Shut off ECU connector clip
Shut off the instrument cluster plug.
Connect the ECU plug terminal 5,7,9 and instrument
cluster plug?
No
Replace the wiring harness and
step 5
Yes Replace
ECU
4
Remove EC U to check the condition of terminal and
whether the shorting bar is broken.
No
Reconnect EC U connector clip
and next step.
Yes
Troubleshooting followed by the
explanations to customers upon
the repairing procedure.
5
Make sure that the failure will never reoccur after
repairing.
Place the ignition switch in LOC K position
。
Shut off accumulator negative line and keep the status for
at least 1 minute.
Connect all ECU plugs
Connect the driver’s side safety airbag combined
instrument plug
Connect the passengers’ side safety airbag combined
instrument plug
Connect the driver and passengers’ side pretension safety
belts plugs.
(Vehicles with pretension safety-belts)
Connect clock spring plug
Connect the accumulator negative line
Place the ignition switch in ON position
Does the safety airbag alarm lamp work functionally?
No
Retest the failure symptoms;
repeat from step 1 if the failure
reoccurs.
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