Code No.B1856:
e-Call Speaker Connection
caution |
When replacing the ECU, always
check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
If the system detects that the e-Call speaker or the door speaker (passenger’s
side) is disconnected for 5 seconds or more, the e-Call control unit sets diagnosis code No.
B1856.
note |
When diagnosis code No. B1856 is set, the e-Call switch flashes in green.
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PROBABLE CAUSES
- Damaged wiring harness or connector(s)
- Malfunction of e-Call speaker or door speaker
- Malfunction of e-Call relay box
- Malfunction of e-Call control unit
DIAGNOSIS PROCEDURE
STEP 1. Check the M.U.T.-III Diagnosis code for other.
Check if diagnosis code No.B1864 is set in the e-Call control unit.
Q.
Is the diagnosis code set?
Trouble shooting diagnosis code No.B1864 (Refer to
).
Go to Step 2
STEP 2. M.U.T.-III special function.
Check the speaker (Refer to
).
Test
- Item No.2: e-Call speaker check (Beep)
- Item No.4: Door speaker check (Beep)
OK: A beep sound is heard (during the test).
Q.
Is the check result normal?
Go to Step 8
NO <Item No.2>
: Go to Step 3
NO <Item No.4>
: Go to Step 5
NO <Item No.2 and 4>
: Go to Step 7
STEP 3. Resistance measurement at between the e-Call relay box connector
(ESO+ or ESO- terminals).
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(1)Disconnect the e-Call relay box connector, and measure at the wiring harness side.
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(2)Check the resistance between the e-Call relay box connector terminal ESO+ and
ESO-. OK: 0.9 Ω - 120 Ω
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(3)Check the resistance between the e-Call relay box connector (ESO+ terminal)
and body earth. OK: No continuity
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Q.
Is the check result normal?
Replace the e-Call relay box (Refer to
).
Go to Step 4
STEP 4. Check of short to earth or open circuit in ESO+,
ESO- line between the e-Call relay box connector and the e-Call speaker connector.
Q.
Is the check result normal?
Replace the e-Call speaker (Refer to
).
Repair the connector(s) or wiring harness.
STEP 5. Resistance measurement at between the e-Call relay box connector
(DSO+ or DSO- terminals)
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(1)Disconnect the e-Call relay box connector, and measure at the wiring harness side.
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(2)Check the resistance between the e-Call relay box connector terminal DSO+ and
DSO-. OK: 0.9 Ω - 120 Ω
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(3)Check the resistance between the e-Call relay box connector (DSO+ terminal)
and body earth. OK: No continuity
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Q.
Is the check result normal?
Replace the e-Call relay box (Refer to
).
Go to Step 6
STEP 6. Check of short to earth or open circuit in DSO+,
DSO- line between the e-Call relay box connector and the e-Call speaker connector.
Q.
Is the check result normal?
Replace the door speaker (passenger’s side).
Repair the connector(s) or wiring harness.
STEP 7. Resistance measurement at between the e-Call relay box and
the e-Call control unit connectors (SPO+, SPO-, ESI+ or ESI- terminals)
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(1)Disconnect the e-Call control unit and e-Call relay box connector, and measure
at the wiring harness side.
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(2)Check the resistance between the e-Call relay box connector terminal ESI+ and
body earth. OK: No continuity
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(3)Check the resistance between the e-Call relay box connector terminal ESI+ and
e-Call control unit connector terminal SPO+. OK: Continuity exists (2 Ω or less)
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(4)Check the resistance between the e-Call relay box connector terminal ESI- and
e-Call control unit connector terminal SPO-. OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 8
Repair the connector(s) or wiring harness.
STEP 8. 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, and then
wait for 20 seconds.
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(3)Execute "Test" on the M.U.T.-III special function.
- Item No.4: Door speaker (Beep)
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(4)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).