Code No.B1606
Seat belt pre-tensioner (driver’s side) (squib) system (shorted to
squib circuit power supply)
caution |
If the diagnosis code B1606
is set to SRS-ECU, be sure to diagnose the CAN bus line.
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OPERATION
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 in SRS-ECU,
the electric
current is supplied from SRS-ECU to the seat belt pre-tensioner (squib).
TROUBLE JUDGEMENT
The code is set when the SRS-ECU seat belt
pre-tensioner (driver’s side) (squib)
circuit is shorted to power supply.
PROBABLE CAUSES
- Damaged wiring harness and connector
- Seat belt pre-tensioner (driver’s side) (squib) harness shorted to
power
supply
- Malfunction of SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics.
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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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Go to Step 2.
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Repair
the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
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STEP 2. Check whether the diagnosis code is reset.
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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. B1606 set?
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Go to Step 3.
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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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STEP 3. Diagnosis check by dummy resistor connection.
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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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![](../../../img/52/ACC00046AB00ENG.png)
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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 seat belt pre-tensioner
(driver’s side) harness
side connector.
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![](../../../img/52/AC301553DR00ENG.png)
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(3)Connect special tool dummy resistor
(MB991865) to special tool resistor harness (MB991884). (4)Connect
special tool resistor harness to the seat belt pre-tensioner
(driver’s
side) 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. B1606 set?
Go to Step 4.
Replace the seat belt with
pre-tensioner (driver’s side) (Refer to ).
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STEP 4. Voltage measurement at the SRS-ECU connector.
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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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![](../../../img/52/AC905015AC00ENG.png)
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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 SRS-ECU
connector.
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![](../../../img/52/ACC00046AB00ENG.png)
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(3)
danger |
To release the SRS-ECU connector short spring in
the following
operations, disconnect this seat belt 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 seat belt pre-tensioner
(driver’s side) harness
side connector.
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![](../../../img/52/AC905468AU00ENG.png)
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(4)
caution |
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 PTD-,
PTD+ line 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 SRS-ECU harness side
connector.
- Voltage between PTD-, PTD+ line and body earth
OK: 1 V or less (8)Disconnect the negative battery
terminal.
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness PTD-,
PTD+ line between the SRS-ECU connector
and the seat belt pre-tensioner (driver’s side)
connector.
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is the diagnosis code No. B1606 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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