Code No.B1506: Seat Slide Sensor System Fault 1 (Open in the Seat Slide
Sensor Circuit)
| caution |
If diagnosis code B1506 is set in the SRS-ECU, always
diagnose the CAN main bus line.
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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. The most likely causes for this
code to be set are the followings:
- Open circuit in the seat slide sensor or harness
- Malfunction of connector contact
PROBABLE CAUSES
- Open circuit in the seat slide sensor circuit
- Disengaged seat slide sensor connector
- Improper connector contact
- 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 B1506 set?
Go to Step 4 .
Replace the seat
slide sensor (Refer to ). Then go to Step 5
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STEP 4. Check the harness between the SRS-ECU connector C-120 (terminal
No.1 and 2) and the seat slide sensor connector D-33 (terminal No.1 and 2)
for open circuit.
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(1)Disconnect SRS-ECU connector C-120 and seat slide sensor
connector D-33.
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(2)
| 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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Check for continuity between the following terminals.
- SRS-ECU connector C-120 (terminal No.1) and the seat slide sensor
connector D-33 (terminal No.1)
- SRS-ECU connector C-120 (terminal No.2) and the seat slide sensor
connector D-33 (terminal No.2)
OK: Less than 2 Ω
Q.
Are the check results normal?
Erase the diagnosis code memory,
and check the diagnosis code. If diagnosis code B1506 sets, replace the
SRS-ECU (Refer to ). Then go to Step 5 .
Repair the harness
wires between SRS-ECU connector C-120 and seat slide sensor connector D-33.
Then go to Step 5 .
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code B1506 set?
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Return to Step 1 .
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The
procedure is complete.
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