Code No.B1859: e-Call
SW
| caution |
When replacing the ECU, always
check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
- When the system detects an unfeasible voltage in the right or left LED system
for 10 seconds or more, the e-Call control unit sets diagnosis code No. B1859.
| note |
When diagnosis code No. B1859 is set, the e-Call switch flashes in green.
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- When the e-Call switch is ON for 3 minutes or more, the e-Call control unit sets
diagnosis code No. B1859.
| note |
When diagnosis code No. B1859 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 data list
Check the e-Call control unit data list (Refer to 
).
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Item No.
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Check condition
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Normal condition
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1
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- Ignition switch: ON
- e-Call switch: OFF
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OFF
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Q.
Is the check result normal?
Go to Step 4.
Go to Step 2.
STEP 2. Check e-Call switch
Refer to .
Q.
Is the check result normal?
Go to Step 3.
Replace the e-Call switch (Refer to ).
STEP 3. 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: No continuity
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Q.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
STEP 4. M.U.T.-III special function.
Check the indicator (Refer to ).
Test
- Item No.1: Indicator test
OK: The green lamp and red lamp 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 
: Go to Step 5.
STEP 5. Check indicator at between the e-Call switch connector (ID1+,
ID4+ or SW- terminals)
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(1)Disconnect the e-Call switch connector, and measure at the unit 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 indicator illuminates.
OK: The left LED illuminates 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 indicator illuminates.
OK: The right LED illuminates in green.
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Q.
Is the check result normal?
Go to Step 6.
Replace the e-Call switch (Refer to ).
STEP 6. Resistance measurement at between the e-Call switch connector
(ID1+ or ID4+ terminals)
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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 ID1+ and
body earth.
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(3)Check the resistance between the e-Call switch connector terminal ID4+ and
body earth.
OK: No continuity
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Q.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
STEP 7. 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).