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(1)Disconnect the negative battery terminal.
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(2)Disconnect seat belt pre-tensioner (driver’s side) connector D-15 <LHD> or
D-23 <RHD>. Use a flat-tipped screwdriver to pull out the locking button at the harness
side connector, and then disconnect the connector.
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(3)Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884). (4)Connect special tool (MB991884) to the D-15 <LHD> or D-23 <RHD> harness
side connector. (5)Connect the negative battery terminal. (6)Erase diagnosis code memory, and then check the diagnosis code.
Q.
Is diagnosis code B1604 set?
Go to Step 2.
Replace the seat belt with pre-tensioner (driver’s side) (Refer to ).
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(1)Disconnect the negative battery terminal.
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(2)Disconnect SRS-ECU connector C-155.
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(3)
danger |
To prevents the seat belt pre-tensioner from operating unintentionally, disconnect the
seat belt pre-tensioner (driver’s side) connector D-15 <LHD> or D-23 <RHD> to
short the squib circuit.
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Disconnect seat belt pre-tensioner (driver’s side) connector D-15 <LHD> or
D-23 <RHD>. Use a flat-tipped screwdriver to pull out the locking button at the harness
side connector, and then disconnect the connector.
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(4)
caution |
Insert an insulator such as a cable tie to a depth of 4mm or more, otherwise the short
spring will not be released.
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Insert a cable tie [3 mm wide, 0.5 mm thick] between terminals 51, 52
and the short spring to release the short spring.
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(5)Connect D-15 <LHD> or D-23 <RHD> harness side connector to special tool resistor
harness (MB991884).
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(6)
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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Resistance measurement between the following terminals.
- SRS-ECU connector C-155 terminal No.51 and special tool terminal No.1
- SRS-ECU connector C-155 terminal No.52 and special tool terminal No.2
OK: Continuity (Less than 2 Ω)
Q.
Are the check results normal?
Go to Step 3.
Repair the harness wires between SRS-ECU connector C-155 (terminal No.51 and 52)
and the seat belt pre-tensioner (driver’s side) connector D-15 <LHD> or D-23 <RHD> (terminal
No.2 and 1)
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Q.
Is diagnosis code No.B1604 set?
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Replace the SRS-ECU (Refer to ).
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An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
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