Code No.B1852:
Collision Signal Connection
| caution |
- When you check
the SRS-ECU, disconnect the negative (-) battery terminal and wait for 60 seconds or
more before starting work. Insulate the disconnected (-) terminal by wrapping the tape
(Refer to the item No. 5 of GROUP 52B - Service Precautions
 ).
- When replacing the ECU, always check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
If the collision signal from SRS-ECU cannot be received for 5 seconds or more, the e-Call
control unit sets diagnosis code No.B1852.
| note |
- When diagnosis code No. B1852 is set, the e-Call switch flashes in green.
- When diagnosis code No. B1852 and U0151 are set, the e-Call switch illuminates in
red.
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PROBABLE CAUSES
- Damaged wiring harness or connector(s)
- Malfunction of SRS-ECU
- Malfunction of e-Call control unit
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code.
Check whether the SRS-ECU diagnosis codes are set or not.
Q.
Is the diagnosis code set?
Diagnose the SRS-ECU troubleshooting (Refer to GROUP 52B - Diagnosis
Code Chart ).
Go to Step 2.
STEP 2. Voltage measurement at the SRS-ECU connector (TBAC terminal).
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(1)Disconnect the SRS-ECU connector, and measure at the wiring harness side.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check the voltage between the SRS-ECU connector (TBAC terminal) and body earth.
OK: Battery voltage
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Q.
Is the check result normal?
Replace the SRS-ECU.
Go to Step 3.
STEP 3. Resistance measurement at between the e-Call control unit
connector (CSIG terminal) and the SRS-ECU connector (TBAC terminal).
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(1)Disconnect the e-Call control unit connector, SRS-ECU connector, and measure at
the wiring harness side.
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(2)Check the resistance between the e-Call control unit connector (CSIG terminal)
and body earth.
OK: No continuity
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Q.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
STEP 4. Resistance measurement at between the e-Call control unit
connector (CSIG terminal) and the SRS-ECU connector (TBAC terminal).
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(1)Disconnect the e-Call control unit connector, SRS-ECU connector, and measure at
the wiring harness side.
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(2)Check the resistance between the e-Call control unit connector (CSIG terminal)
and SRS-ECU connector (TBAC terminal).
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the e-Call control unit.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the e-Call control unit (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction).