Code No.B1507:
Seat Slide Sensor System Fault Earth Circuit (Short-Circuited to
Earth)
| caution |
If diagnosis code B1507 is set in the SRS-ECU, always
diagnose
the CAN bus lines.
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OPERATION
- The seat slide sensor sets the current value Hi or Low determined by the
seat position.
- The SRS-ECU determines the seat position according to the current value
from the
seat slide sensor.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if there
is abnormal resistance between the input terminals
of the seat slide sensor.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Short to earth in the seat slide sensor harness
- Malfunction of the SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus
lines.
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Q.
Is the check result normal?
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 Go to Step 2 .
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 Repair
the CAN bus line (Refer to GROUP 54F, Diagnosis  ).
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STEP 2. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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(1)Erase the diagnosis code.
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(2)Ignition: LOCK (OFF) position to ON
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(3)On completion, check that the diagnosis code is not
reset.
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Q.
Is the diagnosis code set?
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Go to Step 3 .
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There
is an intermittent malfunction such as poor engaged connector(s) or open
circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 3. Check the seat slide sensor (M.U.T.-III diagnosis
code).
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(1)Disconnect the negative battery terminal.
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(2)Disconnect the seat slide sensor connector
D-33.
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(3)Connect special tool dummy resistor
(MB991865) to special tool resistor harness (MB991866).
(4)
| caution |
Do not insert a test probe into the terminal from
its front side directly, as the connector contact pressure may be
weakened.
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Insert special tool MB991866 into the D-33 harness side connector
by backprobing.
(5)Connect the negative battery terminal.
(6)Erase
the diagnosis code memory, and check the diagnosis code.
Q.
Is diagnosis code B1507 set?
Go to Step 4 .
Replace the seat
slide sensor (Refer to ). Then go
to Step 6 .
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STEP 4. Check the seat slide sensor circuit at the SRS-ECU connector
C-120.
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(1)Disconnect SRS-ECU connector C-120.
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(2)Turn the ignition switch to the "ON" position.
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(3)
| caution |
Do not insert a test probe into the terminal from
its front side directly as the connector
contact pressure may be weakened.
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Measure the voltage between C-120 harness side connector terminals
1 and 2 and body earth.
OK: 0 V
Q.
Is the check result normal?
Erase the diagnosis code memory,
and check the diagnosis code. If diagnosis code
B1507 sets, replace the SRS-ECU (Refer to ). Then go to Step
6 .
Go to
Step 5 .
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STEP 5. Check the harness wires for short circuit to power supply
between SRS-ECU connector C-120 (terminal No.1 and 2) and seat slide
sensor connector D-33 (terminal
No.1 and 2).
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Q.
Are the harness wires between SRS-ECU connector C-120 (terminal No.1 and
2) and seat
slide sensor connector D-33 (terminal No.1 and 2) in good
condition?
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Go to Step 6 .
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Repair the harness wires between
SRS-ECU connector C-120 and seat slide sensor
connector D-33. Then go to Step 6 .
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STEP 6. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code B1507 set?
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Return to Step 1 .
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The
procedure is complete.
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