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Troubleshooting

13-1-2 P1B28: Detection of collision

Judgment Criterion : SRS ECU detects the collision and send the signal for DC 330V shut down.
Fail sale control : Shut off the DC 330V (It is not reset / cancelled by re-start of system.)

[Outline of operation]
Collision is detected by SRS ECU according to the signal from the following sensors.
- Front airbag safing G-sensor [in SRS ECU]
- Analog G-sensor [in SRS ECU]
- G-sensor for Rear impact [under rear seat]
- G-sensor for Side impact [under rear seat]

If the SRS ECU detects the collision and determines the shut off of the DC 330V, SRS-ECU send the signal of “DC
330V shut off ” to EV-ECU.
If EV-ECU receives the signal of “DC 330V shut off “, it makes turn off the main contactor to shut off the DC 330V
circuit and out put the DTC P1B28.
Once SRS ECU send the signal of “DC 330V shut off ” , it continues to output the signal every time while the power
switch is on, unless it is replaced with brand new one.

[System recovery]
Once the SRS ECU detects the collision, SRS-ECU and the related parts are required to repair/replacement.
Make sure to erase the DTC after the repair/replacement of SRS-ECU and related parts, otherwise the DC 330V
circuit never be reverted from shut off mode.

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