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Only when the frontal impact exceeding the threshold is simultaneously detected (turned ON) by the front impact sensor as well as by the analogue G-sensor and safing G-sensor in SRS-ECU, the electric current is supplied from SRS-ECU to the pre-tensioner (squib).
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The code is set when the input terminal of SRS-ECU seat belt with pre-tensioner (LH) (squib) is shorted to power supply.
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- Damaged wiring harness and connector
- Seat belt with pre-tensioner (LH) (squib) harness shorted to power supply
- Malfunction of SRS-ECU
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting  ).
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(1)Connect the negative battery terminal.
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(2)After erasing the diagnosis code memory, check the diagnosis code again.
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(3)Disconnect the negative battery terminal.
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Q.
Is the diagnosis code No. B1C48 set?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
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(2)Use the flat-tipped screwdriver to pull out the locking button of harness side connector. After releasing the lock, disconnect the D-22 harness side connector.
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(3)Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884).
(4)Connect the special tool resistor harness to the D-22 harness side connector.
(5)Connect the negative battery terminal.
(6)After erasing the diagnosis code memory, check the diagnosis code again.
(7)Disconnect the negative battery terminal.
Q.
Is the diagnosis code No. B1C48 set?
 Go to Step 4.
Replace the seat belt with pre-tensioner (Refer to ).
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(1)Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
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(2)While pushing the part "A" indicated in the figure of the harness side connector, turn the lock lever to the direction of the arrow to release the lock lever, and disconnect the C-121 SRS-ECU connector.
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(3)
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To release the SRS-ECU connector short spring in the following operations, disconnect this pre-tensioner connector, and keep the squib circuit shorted.
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Use the flat-tipped screwdriver to pull out the locking button of harness side connector. After releasing the lock, disconnect the D-22 harness side connector.
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(4)
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The short spring may not be released due to the insufficient insertion. Therefore, insert the insulator for 4 mm or more.
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Insert an insulator (width: 3 mm, thickness: 0.5 mm) such as cable tie between the terminal 43/44 <RHD> and the terminal 45/46 <LHD>, and the short spring, and release the short spring.
(5)Connect the negative battery terminal.
(6)Ignition switch: ON
(7)Take the measurements below at the C-121 harness side connector.
- Voltage between terminal No. 43/44 and body earth <RHD>
- Voltage between terminal No. 45/46 and body earth <LHD>
OK: 0 V
(8)Disconnect the negative battery terminal.
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness between the C-121 SRS-ECU connector terminal No. 43/44 and the D-22 pre-tensioner connector terminal No. 2/1<RHD>, and between the C-121 SRS-ECU connector terminal No. 45/46 and the D-22 pre-tensioner connector terminal No. 1/2 <LHD>.
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Q.
Is the diagnosis code No. B1C48 set?
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Replace SRS-ECU (Refer to ).
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
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