Code No.B1595:
Front impact sensor (RH) system (short circuit in the sensor) Code No.B1596: Front
impact sensor (RH) system (open circuit in the sensor) Code No.B1597: Front impact
sensor (RH) system (short circuit in the earth) Code No.B1598: Front impact sensor (RH) system
(short circuit in the power supply) Code No.B1599: Front impact sensor (LH) system
(short circuit in the sensor) Code No.B1600: Front impact sensor (LH) system (open
circuit in the sensor) Code No.B1601: Front impact sensor (LH) system (short circuited
in the earth) Code No.B1602: Front impact sensor (LH) system (short circuited in the
power supply)
OPERATION
If the front impact sensor suffers an impact above preset limits, its built-in switch
will be turned of, thus energizing the inflator.
DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes are set if these are 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
B1595
Right front impact sensor or its wiring shorted
B1596
Right front impact sensor or wiring open circuit
B1597
Short to body earth in the right front impact sensor harness
B1598
Short to the power supply in the right front impact sensor harness
B1599
Left front impact sensor or its wiring shorted
B1600
Left front impact sensor or wiring open circuit
B1601
Short to body earth in the left front impact sensor harness
B1602
Short to the power supply in the left front impact sensor harness
PROBABLE CAUSES
Damaged harness wires and connectors
Front impact sensor failed
Malfunction of the SRS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check the front impact sensor.
Refer to .
Q.
Is the check result normal?
Go to Step 2
Replace the front impact sensor (Refer to ).
STEP 2. Resistance measurement at the B-112 SRS-ECU connector.
(1)Check that the negative auxiliary battery terminal is disconnected. If the negative
auxiliary battery terminal is connected, disconnect it.
(2)Disconnect the B-112 SRS-ECU connector.
(3)
caution
Do not insert a test probe into the terminal from
its front side directly as the connector contact pressure may be weakened.
Take the measurements below at harness side connector B-112.
Resistance between terminals 29 and 30 as well as 35 and 36.
OK: 820 ± 82 Ω
(4)
Continuity between terminals 29, 30, 35, 36 and
body earth
OK: Open circuit
Q.
Is the check result normal?
Go to Step 3
Go to Step 4
STEP 3. Voltage measurement at the B-112 SRS-ECU connector.
(1)Check that the negative auxiliary battery terminal is disconnected. If the negative
auxiliary battery terminal is connected, disconnect it.
(2)Disconnect the B-112 SRS-ECU connector.
(3)Connect the negative auxiliary battery terminal.
(4)Electric motor switch to the "ON" position.
(5)
caution
Do not insert a test probe into the terminal from
its front side directly as the connector contact pressure may be weakened.
Take the measurements below at harness-side connector C-154.
Voltage between terminals 29, 30, 35, 36 and body earth
OK: 1 V or less
Q.
Is the check result normal?
Go to Step 5
Go to Step 4
STEP 4. Check the wiring harness between A-24 right front impact sensor
connecter (terminals No. 1 and 2) and B-112 SRS-ECU connector (terminals No. 36 and 35) as well
as between A-15 left front impact sensor connector (terminals No. 1 and 2) and B-112 SRS-ECU
connector (terminals No. 29 and 30).
Check the front impact sensor output line for open or
short circuit.
note
Before the wiring harness check, check B-28 intermediate connector, and repair if necessary.
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness.
STEP 5. Check whether the diagnosis code is reset.
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)
)
)
)
.
Go to Step 2
Replace the front impact sensor (Refer to 