Code No.1A : Front impact sensor LH system (Short circuit in the sensor)
Code No.1B : Front impact sencor LH system (Open circuit in the sensor)
Code No.1C : Front impact sensor LH system (Shoru circuit in the power supply)
Code No.1D : Front impact sensor LH system (Short circuit in the earth)
Code No.2A : Front impact sensor RH system (Short circuit in the sensor)
Code No.2B : Front impact sencor RH system (Open circuit in the sensor)
Code No.2C : Front impact sensor RH system (Shoru circuit in the power supply)
Code No.2D : Front impact sensor RH system (Short circuit in the earth)
Code No.1B : Front impact sencor LH system (Open circuit in the sensor)
Code No.1C : Front impact sensor LH system (Shoru circuit in the power supply)
Code No.1D : Front impact sensor LH system (Short circuit in the earth)
Code No.2A : Front impact sensor RH system (Short circuit in the sensor)
Code No.2B : Front impact sencor RH system (Open circuit in the sensor)
Code No.2C : Front impact sensor RH system (Shoru circuit in the power supply)
Code No.2D : Front impact sensor RH system (Short circuit in the earth)
OPERATION
- When the left and right front impact sensors detect a collision, the switches inside the sensors turns ON.
- SRS-ECU judges how severe a collision is by detecting signals from the front impact sensors and the front air bag analog G-sensor. If the impact is over a predetermined level, the SRS-ECU outputs an ignition signal. At this time, if the front air bag safing G-sensor is on, the SRS air bag will inflate.
DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes are set if these is abnormal resistance between the input terminals of the front impact sensors.The most likely causes for these codes to be set are shown in the table below:
| Code No. |
Trouble causes |
|---|---|
| 1A |
|
| 1B |
|
| 1C |
|
| 1D |
|
| 2A |
|
| 2B |
|
| 2C |
|
| 2D |
|
PROBABLE CAUSES
- Malfunction of the front impact sensor
- Damaged wiring harnesses or connector.
- Malfunction of the SRS-ECU.
DIAGNOSIS PROCEDURE
)
- Measure the resistance between terminals and check whether it is within the standard value.
Standard value: 820 ±
82 Ω
)
- Check for continuity between the terminal and bracket.
OK: No continuity
Q: Does the resistance meet the value above, and is there no continuity?
YES:
Go to Step 2
.NO: Replace front impact sensor. Refer to
.)
- Measure the resistance between terminal 3 and terminal 4.
CAUTIONOK: 820 ±
82 Ω
)
- Measure the resistance between terminal 1 and terminal 2.
OK: 820 ±
82 Ω
)
- Measure the resistance between terminal 1, 2, 3, 4 and body earth.
OK: 2 MΩ
or more
- Ignition switch: ON position
)
- Measure the voltage between terminal 1, 2, 3, 4 and body earth.
OK: 0 V
Q: Is the check result normal?
YES:
Go to Step 4.NO: Go to Step 3
.STEP 3. Connector check: SRS-ECU connector C-115, front impact sensor (LH) connector A-17, intermediate connector C-116, front impact sensor (RH) connector A-28 and intermediate connector C-14
Q: Is the check result normal?
YES:
Check the harness wires for open or short circuit between SRS-ECU connector C-115 (terminal No.3 and 4) and front impact sensor (LH) connector A-17 (terminal No.1 and 2), SRS-ECU connector C-115 (terminal No.1 and 2) and front impact sensor (RH) connector A-28 (terminal No.1 and 2), and repair if necessary. Then go to Step 4.NO: Repair or replace it. Then go to Step 4
.STEP 4. Check whether the diagnosis code is reset.
Q: Is any of diagnosis code 1A, 1B, 1C, 1D, 2A, 2B, 2C or 2D set?
YES:
Return to Step 1.NO: The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points
).