renewed; if not, check the SRS warning lamp circuit.
2. Check for SRS warning lamp circuit
Before checking the SRS warning lamp circuit, exam the fuse of the engine ECU; if the fuse has
been burned out, it shall be renewed; if it works normally, go to the following checking process.
(1) Preparation before checking.
(2) Connect the negative ground wire on the battery and wait for at least 3min.
(3) Turn the ignition switch to position ACC or ON.
(4) Measure the voltage between the LA pin of the air bag ECU and the vehicle body.
(5) Normal voltage: 0~4V. If the voltage is abnormal, check the SRS warning lamp or repair the
SRS warning lamp circuit. If normal, go to the following process.
(6) Remove the negative ground wire from the battery and wait for at least 3min.
(7) Connect the air bag ECU interface. See Fig. 5-11.
Fig. 5-11
(8) Connect the negative ground wire on the battery and wait for at least 3min.
(9) Turn the ignition switch to position ACC or ON.
(10) Observe whether the SRS warning lamp is lighted or not; if lighted, the malfunctions have
been cleared; if not, check the LA terminal of the air bag ECU. If normal, the air bag ECU shall be
renewed.
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