Code No.B1858: e-Call
SW Connection
| caution |
When replacing the ECU, always
check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
When the system detects an open circuit in the right or left LED system for 10 seconds
or more, the e-Call control unit sets diagnosis code No. B1858.
| note |
When diagnosis code No. B1858 is set, the e-Call switch illuminates in red.
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PROBABLE CAUSES
- Damaged wiring harness or connector(s)
- Malfunction of e-Call switch
- Malfunction of e-Call control unit
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III special function.
Check the indicator (Refer to 
).
Test
- Item No.1: Indicator test
OK: The right and left LEDs illuminate alternately every one second (during the test).
Q.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction).
NO <Both LEDs>
: Go to Step 2
NO <The left LED or the right LED> : Go to Step 3
STEP 2. Resistance measurement at the e-Call switch connector (SW1- terminal)
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(1)Disconnect the e-Call switch connector, and measure at the wiring harness side.
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(2)Check the resistance between the e-Call switch connector terminal SW1- and
body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 3
Repair the connector(s) or wiring harness.
STEP 3. Check indicator at between the e-Call switch connector (ID1+,
ID4+ SW- terminals)
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(1)Disconnect the e-Call switch connector, and measure at the wiring harness side.
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(2)Apply a voltage of approximately 5 V between the e-Call switch connector terminal
ID1+ and SW-, and check that the e-Call switch illuminates.
OK: The left LED in the e-Call switch illuminate in red.
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(3)Apply a voltage of approximately 5 V between the e-Call switch connector terminal
ID4+ and SW-, and check that the e-Call switch illuminates.
OK: The right LED in the e-Call switch illuminate in green.
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Q.
Is the check result normal?
Go to Step 4
Replace the e-Call switch (Refer to ).
STEP 4. Resistance measurement at between the e-Call control unit
and the e-Call switch connector (IND1, IND4, ID1+ or ID4+ terminals)
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(1)Disconnect the e-Call control unit and e-Call switch connector, and measure at
the wiring harness side.
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(2)Check the resistance between the e-Call control unit connector terminal IND1 and
e-Call switch connector terminal ID1+.
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(3)Check the resistance between the e-Call control unit connector terminal IND4 and
e-Call switch connector terminal ID4+.
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).